10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 10-Q

ý	QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
	For the quarterly period ended March 31, 2013

OR

¨	TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
	For the transition period from to .

COMMISSION FILE NUMBER: 001-35377

Inergy Midstream, L.P.

(Exact name of registrant as specified in its charter)

Delaware	20-1647837
(State or other jurisdiction of incorporation or organization)	(IRS Employer Identification No.)

Two Brush Creek Blvd., Suite 200 Kansas City, Missouri	64112
(Address of principal executive offices)	(Zip code)

(816) 842-8181

(Registrant’s telephone number, including area code)

(Former name, former address and former fiscal year,

if changed since last report)

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.    Yes  ý    No  ¨

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate website, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that registrant was required to submit and post such files).    Yes  ý    No  ¨

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer or a smaller reporting company. See definitions of “large accelerated filer”, “accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act.

Large accelerated filer	¨	Accelerated filer	¨
Non-accelerated filer	x  (Do not check if a smaller reporting company)	Smaller reporting company	¨

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).    Yes  ¨    No  ý

INERGY MIDSTREAM, L.P.

INDEX TO FORM 10-Q

	Page
Part I – Financial Information
Item 1 – Financial Statements of Inergy Midstream, L.P.:
Consolidated Balance Sheets as of March 31, 2013 (unaudited) and September 30, 2012	3
Unaudited Consolidated Statements of Operations for the Three and Six Months Ended March 31, 2013 and 2012	4
Unaudited Consolidated Statements of Comprehensive Income for the Three and Six Months Ended March 31, 2013 and 2012	5
Unaudited Consolidated Statement of Partners’ Capital for the Six Months Ended March 31, 2013	6
Unaudited Consolidated Statements of Cash Flows for the Six Months Ended March 31, 2013 and 2012	7
Unaudited Notes to Consolidated Financial Statements	9
Item  2 – Management’s Discussion and Analysis of Financial Condition and Results of Operations	24
Item 3 – Quantitative and Qualitative Disclosures About Market Risk	32
Item 4 – Controls and Procedures	33
Part II – Other Information
Item 1 – Legal Proceedings	34
Item 1A – Risk Factors	34
Item 2 – Unregistered Sales of Equity Securities and Use of Proceeds	34
Item 3 – Defaults Upon Senior Securities	34
Item 4 – Mine Safety Disclosures	34
Item 5 – Other Information	34
Item 6 – Exhibits	35
Signature	36

2

PART I. FINANCIAL INFORMATION

Item 1. Financial Statements of Inergy Midstream, L.P.

INERGY MIDSTREAM, L.P. CONSOLIDATED BALANCE SHEETS (in millions, except unit information)
	March 31, 2013		September 30, 2012
	(unaudited)
Assets
Current assets:
Cash and cash equivalents	$	0.3	$	—
Accounts receivable	25.5		19.3
Inventories (Note 3):	5.7		5.6
Prepaid expenses and other current assets	9.4		5.4
Total current assets	40.9		30.3
Property, plant and equipment (Note 3):	1,212.6		1,068.7
Less: accumulated depreciation	232.7		200.8
Property, plant and equipment, net	979.9		867.9
Intangible assets (Note 3):
Customer accounts	191.2		38.3
Other intangible assets	20.5		5.2
	211.7		43.5
Less: accumulated amortization	24.3		14.2
Intangible assets, net	187.4		29.3
Goodwill	259.4		96.5
Other assets	2.9		3.9
Total assets	$	1,470.5	$	1,027.9
Liabilities and partners’ capital
Current liabilities:
Accounts payable	$	2.8	$	3.9
Accrued expenses	23.6		51.4
Current portion of long-term debt (Note 5)	0.9		1.5
Total current liabilities	27.3		56.8
Long-term debt, less current portion (Note 5)	711.0		415.0
Other long-term liabilities	0.8		0.8
Partners’ capital (Note 6):
Limited partner unitholders (85,903,064 and 75,181,930 common units issued and outstanding at March 31, 2013 and September 30, 2012, respectively)	731.4		555.3
Total partners’ capital	731.4		555.3
Total liabilities and partners’ capital	$	1,470.5	$	1,027.9

The accompanying notes are an integral part of these consolidated financial statements.

3

INERGY MIDSTREAM, L.P. CONSOLIDATED STATEMENTS OF OPERATIONS (in millions, except unit and per unit data) (unaudited)
	Three Months Ended				Six Months Ended
	March 31,				March 31,
	2013		2012(a)		2013		2012(a)
Revenue:
Firm storage	$	20.3	$	20.2	$	40.5	$	41.1
Transportation	15.7		7.6		23.9		14.1
Hub services	2.3		2.4		5.5		6.7
Related party firm storage (Note 8)	3.3		3.3		6.7		5.3
Salt	11.3		13.4		23.9		26.5
Crude	10.9		—		13.7		—
	63.8		46.9		114.2		93.7
Costs and expenses:
Storage related	2.8		1.6		5.0		3.5
Transportation related	1.1		1.4		2.1		3.1
Salt related	7.3		8.0		14.7		15.5
Crude related	1.6		—		1.9		—
Operating and administrative	13.3		6.8		25.0		12.9
Depreciation and amortization	25.9		12.7		41.1		24.7
Loss on disposal of assets	—		—		0.6		—
	52.0		30.5		90.4		59.7
Operating income	11.8		16.4		23.8		34.0
Interest expense, net	8.6		—		14.1		—
Net income	$	3.2	$	16.4	$	9.7	$	34.0
Less: net income prior to initial public offering of Inergy Midstream, L.P.	—		—		—		12.9
Less: net income earned by US Salt, LLC prior to acquisition	—		3.0		—		6.2
Net income available to partners	$	3.2	$	13.4	$	9.7	$	14.9
Partners’ interest information:
Non-managing general partner interest in net income	$	2.2	$	—	$	3.9	$	—
Total limited partners’ interest in net income	$	1.0	$	13.4	$	5.8	$	14.9
Net income per limited partner unit:
Basic	$	0.01	$	0.18	$	0.07	$	0.20
Diluted	$	0.01	$	0.18	$	0.07	$	0.20
Weighted-average limited partners’ units outstanding (in thousands):
Basic	85,887		74,337		81,932		74,334
Diluted	85,887		74,337		81,932		74,334

(a) Retrospectively adjusted as described in Note 1.

The accompanying notes are an integral part of these consolidated financial statements.

4

INERGY MIDSTEAM, L.P. CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (in millions) (unaudited)
	Three Months Ended March 31,				Six Months Ended March 31,
	2013		2012(a)		2013		2012(a)
Net income	$	3.2	$	16.4	$	9.7	$	34.0
Change in unrealized fair value on cash flow hedges (Note 2)	—		—		—		—
Comprehensive income	$	3.2	$	16.4	$	9.7	$	34.0

(a) Retrospectively adjusted as described in Note 1.

The accompanying notes are an integral part of these consolidated financial statements.

5

INERGY MIDSTREAM, L.P. CONSOLIDATED STATEMENT OF PARTNERS’ CAPITAL (in millions) (unaudited)
	Total Partners’ Capital
Balance at September 30, 2012	$	555.3
Net proceeds from issuance of common units	224.5
Distributions to Inergy, L.P.	(46.6		)
Distributions to external unitholders	(18.7		)
Unit-based compensation charges	6.0
Equity contribution from Inergy, L.P.	1.2
Net income	9.7
Balance at March 31, 2013	$	731.4

The accompanying notes are an integral part of these consolidated financial statements.

6

INERGY MIDSTREAM, L.P. CONSOLIDATED STATEMENTS OF CASH FLOWS (in millions) (unaudited)
	Six Months Ended
	March 31,
	2013			2012(a)
Operating activities
Net income	$	9.7		$	34.0
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	32.0			23.4
Amortization	9.1			1.3
Amortization of deferred financing costs	3.2			0.3
Unit-based compensation charges	6.0			1.8
Loss on disposal of assets	0.6			—
Changes in operating assets and liabilities, net of effects from acquisitions:
Accounts receivable	(3.0		)	(1.2		)
Inventories	(0.1		)	—
Prepaid expenses and other current assets	(2.2		)	(2.8		)
Other assets	1.0			—
Accounts payable and accrued expenses	3.5			0.2
Payable to Inergy, L.P.	0.4			11.2
Net cash provided by operating activities	60.2			68.2
Investing activities
Acquisitions, net of cash acquired	(424.5		)	—
Purchases of property, plant and equipment	(78.1		)	(81.4		)
Net cash used in investing activities	(502.6		)	(81.4		)
(a) Retrospectively adjusted as described in Note 1.
The accompanying notes are an integral part of these consolidated financial statements.

7

INERGY MIDSTREAM, L.P. CONSOLIDATED STATEMENTS OF CASH FLOWS (in millions) (unaudited)
	Six Months Ended
	March 31,
	2013			2012(a)
Financing activities
Proceeds from the issuance of long-term debt	$	653.2		$	129.0
Principal payments on long-term debt	(357.8		)	(32.0		)
Distributions to Inergy, L.P.	(46.6		)	(120.4		)
Distributions to external unitholders	(18.7		)	(0.7		)
Principal payment on promissory note	—			(255.0		)
Borrowings from related party	—			37.9
Equity contribution from Inergy, L.P.	1.2			—
Payments to related party	—			(33.6		)
Net proceeds from issuance of common units	224.5			292.7
Other	—			(0.1		)
Payments for deferred financing costs	(13.1		)	(4.6		)
Net cash provided by financing activities	442.7			13.2
Net increase in cash	0.3			—
Cash at beginning of period	—			—
Cash at end of period	$	0.3		$	—
Supplemental schedule of noncash investing and financing activities
Net change to property, plant and equipment through accounts payable and accrued expenses	$	(36.6	)	$	7.3
Net change to property, plant and equipment through non-cash capitalized interest	$	—		$	1.7
Extinguishment of indebtedness owed to Inergy, L.P.	$	—		$	152.8
Assumption of promissory note of Inergy, L.P. (Note 6)	$	—		$	255.0
Acquisitions, net of cash acquired:
Current assets	$	5.1		$	—
Property, plant and equipment	102.4			—
Intangible assets	157.4			—
Goodwill	162.9			—
Current liabilities	(3.3		)	—
Total acquisitions, net of cash acquired	$	424.5		$	—

(a) Retrospectively adjusted as described in Note 1.

The accompanying notes are an integral part of these consolidated financial statements.

8

INERGY MIDSTREAM, L.P.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(unaudited)

Note 1 – Organization and Basis of Presentation

Organization

Inergy Midstream, LLC was formed in September 2004 by Inergy, L.P. (“Inergy”) to acquire, develop, own and operate midstream energy assets. In connection with its initial public offering (“IPO”) of common units representing limited partnership interests, (i) Inergy Midstream, LLC converted into a Delaware limited partnership and changed its name to Inergy Midstream, L.P. (the “Company” or "Inergy Midstream") on November 14, 2011, and (ii) the Company transferred to Inergy 100% of its membership interest in two wholly owned subsidiaries (US Salt, LLC and Tres Palacios Gas Storage LLC) on November 25, 2011. The Company's common units began trading on the New York Stock Exchange (“NYSE”) on December 16, 2011 under the symbol “NRGM,” and the IPO closed on December 21, 2011.

Inergy owns all of the Company's Incentive Distribution Rights (“IDRs”) which entitle it to receive 50% of all distributions by the Company in excess of the initial quarterly distribution of $0.37 per unit. IDRs, which represent a limited partnership ownership interest in the Company, are considered to be participating securities because they have the right to participate in earnings with common equity holders. Under the Company's partnership agreement, IDRs participate in net income only to the extent of the amount of cash distributions actually declared, thereby excluding the IDRs from participating in undistributed earnings or losses. Accordingly, the undistributed net income is allocated to the other ownership interests on a pro-rata basis. Inergy indirectly owns the Company's general partnership interest, which entitles the general partner to management but no economic rights in the Company.

Nature of Operations

The Company's financial statements reflect three operating and reporting segments: storage and transportation operations, salt operations and crude operations. The Company's storage and transportation operations are engaged primarily in the storage and transportation of natural gas and natural gas liquids (“NGLs”). Its operations are currently concentrated in the Northeast region of the United States. The Company's salt operations, which are located in New York, include the production and sale of salt products by US Salt, LLC ("US Salt"). US Salt is one of five major solution mined salt manufacturers in the United States, producing evaporated salt products for food, industrial, pharmaceutical and water conditioning uses. The Company's crude operations, which were acquired in December 2012, include the COLT crude oil loading terminal, storage facility and interconnecting pipeline facilities ("COLT Hub") located in North Dakota. See Note 4 for additional information about this acquisition.

The Company owns and operates the following storage facilities:

• Stagecoach, a 26.25 Bcf multi-cycle depleted reservoir natural gas storage facility located approximately 150 miles northwest of New York City in Tioga County, New York and Bradford County, Pennsylvania;

• Thomas Corners, a 7.0 Bcf multi-cycle depleted reservoir natural gas storage facility located in Steuben County, New York;

• Steuben, a 6.2 Bcf single-turn depleted reservoir natural gas storage facility located in Steuben County, New York;

• Seneca Lake, a 1.45 Bcf multi-cycle salt dome reservoir natural gas storage facility located in Schuyler County, New York; and

• Bath, a 1.5 million barrel NGL storage facility located near Bath, New York.

9

INERGY MIDSTREAM, L.P.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(unaudited)

The Company owns and operates natural gas transportation assets in the Northeast, including:

• the compression and appurtenant facilities installed to expand transportation capacity on the Stagecoach north and south laterals (the “North-South Facilities”), which provide 325 MMcf/d of firm interstate transportation service to shippers;

• the MARC I Pipeline, a 39-mile, 30-inch interstate natural gas pipeline that extends from the Company's Stagecoach south lateral interconnect with TGP's 300 Line and Transco's Leidy Line, and capable of providing 550 MMcf/d of firm transportation service to shippers; and

•the East Pipeline, a 37.5-mile, 12-inch diameter intrastate natural gas pipeline in New York.

The Company also owns US Salt, a solution mined salt production facility located on the shores of Seneca Lake outside of Watkins Glen, New York. The solution mining process used by US Salt creates salt caverns that can be developed into usable natural gas and NGL storage capacity.

In December 2012, the Company acquired the COLT Hub, which is strategically located near the town of Epping in Williams County, North Dakota, in the heart of the Bakken and Three Forks shale oil-producing areas. With 720,000 barrels of crude oil storage and two8,700-foot rail loops, the COLT Hub can accommodate 120-car unit trains and is capable of loading up to 120,000 barrels per day by rail. Customers can source product via gathering systems, an eight-bay truck unloading rack and the COLT Connector, a 21-mile, 10-inch bi-directional pipeline that connects the COLT Hub to the Enbridge and Tesoro crude pipelines at Dry Fork (Beaver Lodge/Ramberg junction). The COLT Hub is connected to the Banner crude gathering system and expects to connect to the Meadowlark Midstream (formerly, Bear Tracker Energy) and Hiland Pipeline crude gathering systems in fiscal 2013.

Basis of Presentation

The financial information contained herein as of March 31, 2013, and for the three-month and six-month periods endedMarch 31, 2013 and 2012, is unaudited. The Company believes this information has been prepared in accordance with accounting principles generally accepted in the United States for interim financial information and Article 10 of Regulation S-X. The Company also believes this information includes all adjustments (consisting only of normal recurring adjustments) necessary to present fairly the financial position, results of operations and cash flows for the periods then ended.

On May 14, 2012, the Company acquired 100% of the membership interests in US Salt from Inergy. The US Salt acquisition is reflected in the Company's consolidated financial statements based on the historical values, and periods prior to the acquisition have been retrospectively adjusted to include the historical balances of US Salt. This accounting treatment is similar to the pooling of interests and is required as the transaction is amongst entities under common control.

The accompanying consolidated financial statements include the accounts of Inergy Midstream, L.P. (formerly Inergy Midstream, LLC) and its wholly owned subsidiaries, including among others Arlington Storage Company, LLC (“Arlington”), Central New York Oil And Gas Company, L.L.C. (“CNYOG”), Finger Lakes LPG Storage, LLC (“Finger Lakes”), Inergy Gas Marketing, LLC, Inergy Pipeline East, LLC, US Salt, Inergy Crude Logistics, LLC (formerly Rangeland Energy, LLC), NRGM Finance Corp., and Inergy Storage, Inc.  All significant intercompany transactions, including distribution income, and balances have been eliminated in consolidation.

Prior to the completion of the IPO on December 21, 2011 the Company was a wholly owned subsidiary of Inergy.  The consolidated financial statements that are presented for the periods prior to the IPO have been prepared to represent the net assets and related historical results of the Company as if it were a stand-alone entity with the exception that the operations of Tres Palacios Gas Storage LLC (which was assigned to Inergy on November 25, 2011) has been excluded from the historical results.  The general ledger of each entity owned by the Company (excluding Tres Palacios Gas Storage LLC) forms the primary basis for the accompanying financial statements.  Costs incurred by Inergy which benefit both the Company and Inergy's wholly owned subsidiaries have been allocated in a manner described in “Allocation of Expenses” below.

10

INERGY MIDSTREAM, L.P.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(unaudited)

Principles of Consolidation

The accompanying consolidated financial statements include the accounts of the Company and its subsidiaries. All significant intercompany balances and transactions have been eliminated in consolidation.

Note 2 – Summary of Significant Accounting Policies

Revenue Recognition

Revenue for natural gas and NGL firm storage is recognized ratably over the contract period regardless of the volume of natural gas or NGL stored by the Company's customers. Revenue from natural gas firm storage is affected to a lesser extent by volumes of stored gas received and or delivered by the Company's customers. Revenue for transportation services is recognized ratably over the contract period. Transportation revenue is derived from the sale of capacity that the Company has secured on certain third party pipelines, revenues for transportation on the East Pipeline and transportation revenue from placing the North-South Facilities and the MARC I Pipeline into service in the 2012 and 2013 fiscal years, respectively. Revenue from transportation services is also affected to a lesser extent by volumes of gas transported during the period. Revenue from hub services is recognized ratably over the contract period. Revenues from the sale of salt are recognized when product is shipped to the customer or when certain contractual performance requirements have otherwise been met. Revenues from the COLT Hub are recognized when the contractual services are provided, such as loading of customer rail cars.

Expense Classification

Storage related costs consist of the direct costs to operate the storage and transportation facilities, including power, contractor and fuel costs. These costs support the revenue generated from firm storage, hub services and transportation services due to the intertwined nature of our assets. The Company's transportation related costs consist primarily of costs to procure firm transportation capacity on certain pipelines. Transportation related costs also consist of direct costs to operate the East Pipeline and the MARC I Pipeline. In limited instances, the Company may sell inventory obtained from fuel-in-kind collections. The cost basis of this inventory will be recorded in storage related costs. Operating and administrative expenses consist of all expenses incurred by the Company other than those described above in storage and transportation related costs and depreciation and amortization. Certain operating and administrative expenses and depreciation and amortization are incurred in providing storage services, but are not included in storage and transportation related costs. These amounts were $16.7 million and $11.2 million for the three months endedMarch 31, 2013 and 2012, respectively, and $29.7 million and $21.6 million for the six months endedMarch 31, 2013 and 2012, respectively.

Credit Risk and Concentrations

Inherent in the Company's contractual portfolio are certain credit risks. Credit risk is the risk of loss from nonperformance by suppliers, customers or financial counterparties to a contract. Inergy takes an active role in managing credit risk and has established control procedures, which are reviewed on an ongoing basis. The Company attempts to minimize credit risk exposure through credit policies and periodic monitoring procedures as well as through customer deposits, letters of credit and entering into netting agreements that allow for offsetting counterparty receivable and payable balances for certain financial transactions, as deemed appropriate.

One customer, ConEdison, accounted for approximately 10% and 14% of the Company's total revenue for the three months endedMarch 31, 2013 and 2012, respectively, and 12% and 14% of the Company's total revenue for the six months endedMarch 31, 2013 and 2012, respectively.  No other customer accounted for 10% or more of the Company's total revenue in those periods. All ConEdison revenues are captured in the storage and transportation segment.

Chesapeake Energy Corporation accounted for 14% of the Company's consolidated accounts receivable at March 31, 2013, and ConEdison accounted for 11% of the Company's consolidated accounts receivable at September 30, 2012.

11

INERGY MIDSTREAM, L.P.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(unaudited)

Use of Estimates

The preparation of consolidated financial statements in conformity with accounting principles generally accepted in the United States requires management to make estimates and assumptions that affect the reported amount of assets and liabilities and disclosure of contingent assets and liabilities at the date of the consolidated financial statements and the reported amounts of revenues and expenses during the periods presented. Actual results could differ from those estimates.

Inventories

Inventories for storage and transportation operations, consisting primarily of natural gas, are stated at the lower of cost or market and are computed predominantly using the average cost method. Inventories for salt operations are stated at the lower of cost or market, cost being principally determined on the first-in, first-out method. All costs associated with the production of finished goods at the salt production facility are captured as inventory costs.

Property, Plant and Equipment

Property, plant and equipment are stated at historical cost less accumulated depreciation. The Company capitalizes all construction related direct labor and material costs as well as the cost of funds used during construction. Amounts capitalized for cost of funds used during construction amounted to $1.0 million and $1.1 million during the three months endedMarch 31, 2013, and 2012, respectively, and $2.3 million and $2.9 million during the six months endedMarch 31, 2013, and 2012, respectively. Depreciation is computed by the straight-line method over the estimated useful lives of the assets, as follows:

	Years
Buildings and improvements	15-25
Office furniture and equipment	3-7
Vehicles	3-5
Pipelines	15
Base gas	10
Plant equipment	3-20

Salt deposits are depleted on a unit of production method. Maintenance and repairs are charged to expense as incurred.

The Company reviews its long-lived assets for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. If such events or changes in circumstances are present, a loss is recognized if the carrying value of the asset is in excess of the sum of the undiscounted cash flows expected to result from the use of the asset and its eventual disposition. An impairment loss is measured as the amount by which the carrying amount of the asset exceeds the fair value of the asset. The Company has not identified any indicators that suggest the carrying amount of an asset may not be recoverable for the period ended March 31, 2013.

Identifiable Intangible Assets

Intangible assets acquired in the acquisition of a business are required to be separately recognized if the benefit of the intangible asset is obtained through contractual or other legal rights, or if the intangible asset can be sold, transferred, licensed, rented or exchanged, regardless of the acquirer's intent to do so. Deferred financing costs represent financing costs incurred in obtaining financing and are being amortized over the term of the related debt.

The Company has recorded certain identifiable intangible assets, which are amortized on a straight-line basis over their estimated economic lives, as follows:

	Years
Customer accounts	15-20
Covenants not to compete	3-5
Deferred financing costs	5-8

12

INERGY MIDSTREAM, L.P.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(unaudited)

Goodwill

Goodwill is recognized for various acquisitions by the Company as the excess of the cost of the acquisitions over the fair value of the related net assets at the date of acquisition. Goodwill is subject to at least an annual assessment for impairment by applying a fair-value-based test.

The Company completed its annual impairment test for each of its reporting units and determined that no impairment existed as of September 30, 2012. No indicators of impairment were identified requiring an interim impairment test during the six-month period ended March 31, 2013.

Income Taxes

The Company and its majority unitholder, Inergy, are generally not subject to federal or state income tax. Therefore, the earnings of the Company are included in the federal and state income tax returns of its common unitholders and, as a result of Inergy's majority ownership interest in the Company, the limited partners of Inergy. Net earnings for financial statement purposes may differ significantly from taxable income reportable to unitholders as a result of differences between the tax basis and the financial reporting basis of assets and liabilities and the taxable income allocation requirements under the Company's partnership agreement.

Cash and Cash Equivalents

The Company defines cash equivalents as all highly liquid investments with maturities of three months or less when purchased.

Income Per Unit

The Company calculates basic net income per limited partner unit by utilizing the two class method. Net income available to partners and the weighted-average number of units outstanding are presented only for the period subsequent to the IPO on December 21, 2011. Earnings (net income available to partners) of US Salt is presented only for the period subsequent to the acquisition on May 14, 2012. Basic and diluted net income per unit are the same, as there are no potentially dilutive units outstanding at March 31, 2013.

Fair Value

The carrying amounts of cash, accounts receivable and accounts payable approximate their fair value. As of March 31, 2013, the estimated fair value of the Company's fixed-rate senior notes, based on available trading information, totaled $522.5 million compared with the aggregate principal amount at maturity of $500.0 million. The fair value of debt was determined based on market quotes from Bloomberg. At March 31, 2013, the Company's $600.0 million revolving credit facility had amounts outstanding of $211.9 million, which approximated fair value due primarily to the floating interest rate associated with borrowings under the credit facility.

Transactions with Inergy

Inergy has historically provided the Company with funding to support its acquisition, capital expansion and working capital needs. The amounts provided by Inergy to finance acquisitions were considered to be permanent investments by Inergy and have accordingly been classified as parent company's investment on the consolidated financial statements of the Company. Amounts financed to support capital expansion and working capital needs, net of what the Company provided to Inergy were considered to be loans and were classified as payable to Inergy on the Company's consolidated financial statements. In connection with the Company's IPO on December 21, 2011, Inergy extinguished $152.8 million of indebtedness owed by the Company, which was treated as a capital contribution by Inergy.

Subsequent to the IPO, the Company used its revolving credit facility to finance acquisitions and its capital expansion and working capital needs.

Interest on intercompany loans provided by Inergy was historically charged on the loan balances during the period of construction of the Company's expansion projects.

13

INERGY MIDSTREAM, L.P.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(unaudited)

Allocation of Expenses

The Company shares common management, operating and administrative and overhead costs with Inergy. The shared costs allocated to the Company totaled $5.0 million (including $3.0 million of unit-based compensation charges) and $2.3 million (including $0.9 million of unit-based compensation charges) for the three months endedMarch 31, 2013 and 2012, respectively, and $9.1 million (including $5.2 million of unit-based compensation charges) and $4.8 million (including $1.8 million of unit-based compensation charges) for the six months endedMarch 31, 2013 and 2012, respectively. In conjunction with its IPO, the Company entered into an Omnibus Agreement with Inergy that requires the Company to reimburse Inergy for all shared costs incurred on its behalf. Due to the nature of these shared costs, it is not practicable to estimate what the costs would have been on a stand-alone basis. Accordingly, the accompanying financial statements may not necessarily be indicative of the conditions that would have existed, or the results of operations that would have occurred, if the Company had operated as a stand-alone entity.

Comprehensive Income (Loss)

Comprehensive income includes net income and other comprehensive income. Other comprehensive income includes the realized loss on a derivative instrument that the Company entered into to hedge the purchase of base gas for one storage facility. The amount included in other comprehensive income associated with this derivative is being reclassified to earnings over the same period that the hedged base gas is recorded in earnings. The amount reclassified to earnings for the six-month period ended March 31, 2013 was not material.

Property Tax Receivable

The Company receives property tax benefits under New York's Empire State Development program. The amounts due to be refunded to the Company under this program amounted to $4.9 million and $5.7 million as of March 31, 2013 and September 30, 2012, respectively. At March 31, 2013, $2.0 million of the amounts due to be refunded were classified in prepaid expenses and other current assets, and $2.9 million were classified in other long-term assets on the consolidated balance sheets. At September 30, 2012, $2.0 million of the amounts due to be refunded were classified in prepaid expenses and other current assets, and $3.7 million were classified in other long-term assets on the consolidated balance sheets.

Prepaid Property Taxes

The Company prepays property taxes in certain taxing jurisdictions and thus records the amount of taxes relating to future periods in prepaid expenses and other current assets, which totaled $2.4 million and $1.7 million at March 31, 2013 and September 30, 2012, respectively.

Property, Plant and Equipment Accrual

The Company has accrued for property, plant and equipment, including certain construction work in process relating to construction efforts on various growth projects. At March 31, 2013 the Company had accrued $8.5 million relating to property, plant and equipment, of which $7.9 million was classified as accrued expenses and $0.6 million was classified as accounts payable on the consolidated balance sheets. At September 30, 2012 the Company had accrued $45.1 million relating to property, plant and equipment, of which $44.1 million was classified as accrued expenses and $1.0 million was classified as accounts payable on the consolidated balance sheets.

Asset Retirement Obligations

An asset retirement obligation ("ARO") is an estimated liability for the cost to retire a tangible asset. The fair value of these AROs could not be made as settlement dates (or range of dates) associated with these assets were not estimable.

Accounting for Unit-Based Compensation

The Company has a unit-based employee compensation plan and all share-based payments to employees, including grants of employee stock options, are recognized in the income statement based on their fair values. The amount of compensation expense recorded by the Company during the three months endedMarch 31, 2013 was $3.4 million ($3.0 million allocated by Inergy for Inergy units and $0.4 million for Inergy Midstream units). The amount of compensation expense allocated to the

14

INERGY MIDSTREAM, L.P.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(unaudited)

Company during the three months endedMarch 31, 2012 was $0.9 million. The amount of compensation expense recorded by the Company during the six months endedMarch 31, 2013 was $6.0 million ($5.2 million allocated by Inergy for Inergy units and $0.8 million for Inergy Midstream units). The amount of compensation expense allocated to the Company during the six months endedMarch 31, 2012 was $1.8 million.

Segment Information

There are certain accounting requirements that establish standards for reporting information about operating segments, as well as related disclosures about products and services, geographic areas and major customers. Further, they define operating segments as components of an enterprise for which separate financial information is available that is evaluated regularly by the chief operating decision maker in deciding how to allocate resources and assess performance. In determining its operating segments, the Company examined the way it organizes its business internally for making operating decisions and assessing business performance. See Note 9 for disclosures related to the Company's three operating and reporting segments.

Recently Issued Accounting Pronouncements

On February 5, 2013, the FASB issued ASU No. 2013-02, “Reporting of Amounts Reclassified Out of Accumulated Other Comprehensive Income.” This ASU amends and clarifies the disclosure requirements prescribed in ASU No. 2011-05, “Comprehensive Income (Topic 220): Presentation of Comprehensive Income.” ASU No. 2013-02 requires that entities present information about reclassification adjustments from accumulated other comprehensive income in their annual financial statements in a single note or on the face of the financial statements. Public entities will also have to provide this information in their interim financial statements. Specifically, entities must present, either in a single note or parenthetically on the face of the financial statements, the effect of significant amounts reclassified from each component of accumulated other comprehensive income based on its source and the income statement line items affected by the reclassification. If a component is not required to be reclassified to net income in its entirety, entities would instead cross reference to the related footnote for additional information.  The Company will be subject to the requirements of ASU No. 2013-02 effective October 1, 2013, and the Company is currently reviewing the effect of this ASU.

Note 3 – Certain Balance Sheet Information

Inventories

Inventories consisted of the following at March 31, 2013 and September 30, 2012, respectively (in millions):

	March 31, 2013		September 30, 2012
Parts and supplies	$	4.3	$	4.2
Natural gas	0.4		0.4
Raw materials	0.3		0.2
Finished goods	0.7		0.8
Total inventories	$	5.7	$	5.6

15

INERGY MIDSTREAM, L.P.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(unaudited)

Property, Plant and Equipment

Property, plant and equipment consisted of the following at March 31, 2013 and September 30, 2012, respectively (in millions):

	March 31, 2013		September 30, 2012
Plant equipment	$	332.1	$	225.3
Salt deposits	41.6		41.6
Land and buildings	248.0		180.2
Pipelines	424.5		213.1
Vehicles	3.3		3.0
Construction in process	87.1		331.4
Base gas	73.5		73.1
Office furniture and equipment	2.5		1.0
	1,212.6		1,068.7
Less: accumulated depreciation	232.7		200.8
Total property, plant and equipment, net	$	979.9	$	867.9

Intangible Assets

Intangible assets consisted of the following at March 31, 2013 and September 30, 2012, respectively (in millions):

	March 31, 2013		September 30, 2012
Customer accounts	$	191.2	$	38.3
Covenants not to compete	4.4		—
Deferred financing and other costs	16.1		5.2
	211.7		43.5
Less: accumulated amortization	24.3		14.2
Total intangible assets, net	$	187.4	$	29.3

Note 4 – Business Acquisitions

On December 7, 2012, the Company completed the acquisition of 100% of the ownership interest of Rangeland Energy, LLC in exchange for $425 million in cash, net of cash acquired in the transaction and subject to certain closing adjustments. Rangeland Energy, LLC was the owner and operator of the COLT Hub. Concurrently with the closing of the acquisition, the Company completed the private placement of $225 million common units and $500 million in senior unsecured notes due 2020. The remaining net proceeds from these offerings were used to repay borrowings under the Credit Facility.

The primary purpose of this acquisition was to acquire the integrated crude oil loading terminal, storage, and pipeline assets of Rangeland Energy, LLC and its subsidiaries, which are located in Williams County, North Dakota. The COLT Hub primarily consists of 720,000 barrels of crude oil storage, two8,700-foot rail loops, an eight-bay truck unloading rack, and a 21-mile bi-directional crude oil pipeline that connects the hub to gathering systems and interstate crude oil pipelines.

16

INERGY MIDSTREAM, L.P.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(unaudited)

The following table summarizes the estimated fair values of the assets acquired and liabilities assumed at the acquisition date (in millions):

	December 7, 2012
Current assets	$	3.4
Property, plant and equipment	102.4
Intangible assets	157.4
Total identifiable assets acquired	263.2
Current liabilities	3.3
Total liabilities assumed	3.3
Net identifiable assets acquired	259.9
Goodwill	162.9
Net assets acquired	$	422.8

The $162.9 million of goodwill has been assigned to the crude segment. Goodwill recognized in the transaction relates primarily to expanding our geographic footprint into a new growing shale play. The name of the acquired entity has since been changed from Rangeland Energy, LLC to Inergy Crude Logistics, LLC. Based on the preliminary purchase price allocation, amortization expenses relative to the intangible assets acquired are expected to be $21.1 million, $29.3 million, $29.0 million, $21.8 million, and $12.4 million for the years ended September 30, 2013 through September 30, 2017, respectively.

The following represents the pro forma consolidated statements of operations as if the COLT Hub had been included in the consolidated results of the Company for the three-month period ended March 31, 2012 and for the full six-month periods ended March 31, 2013 and 2012 (in millions):

	(Unaudited) Pro Forma Consolidated Statement of Operations
	Three Months Ended March 31,		Six Months Ended March 31,
	2012		2013		2012
Revenue	$	47.0	$	119.4	$	93.8
Net income	$	6.1	$	5.5	$	13.4
Net income per limited partner unit:
Basic	$	0.04	$	0.02	$	(0.08	)
Diluted	$	0.04	$	0.02	$	(0.08	)

These amounts have been calculated after applying the Company's accounting policies and adjusting the results of Rangeland Energy, LLC to reflect the depreciation and amortization that would have been charged assuming the preliminary fair value adjustments to property, plant and equipment and intangible assets had been made at the beginning of the current period.  The purchase price allocation for this acquisition has been prepared on a preliminary basis pending final asset valuation and asset rationalization, and changes are expected when additional information becomes available. Accordingly, the purchase accounting adjustments made in connection with the development of the unaudited pro forma are preliminary and subject to change. The entities acquired were development stage entities (as defined by ASC Topic 915, Development Stage Entities) until commencing principal commercial operations in June 2012.

17

INERGY MIDSTREAM, L.P.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(unaudited)

Note 5 - Long-Term Debt

Credit Facility

On December 21, 2011, the Company entered into a new $500 million revolving credit facility (“Credit Facility”). The Credit Facility, which matures in December 2016, is available to fund acquisitions, working capital and internal growth projects and for general partnership purposes. The Credit Facility has an accordion feature that allows the Company to increase loan commitments by up to $250 million, subject to the lenders' agreement and the satisfaction of certain conditions. The Credit Facility includes a $10 million sub-limit for same-day swing line advances, and a $100 million sub-limit for letters of credit.

On April 16, 2012, the Company exercised a portion of its accordion feature under the Credit Facility and increased the loan commitments thereunder by $100 million and as a result, the accordion feature available to the Company is now $150 million. The aggregate amount of revolving loan commitments under the Credit Facility is now $600 million, and can be increased by up to $150 million, subject to the lenders' agreement and the satisfaction of certain conditions.

On November 16, 2012, the Company amended its revolving credit facility to, among other things, (i) amend the definition of consolidated EBITDA to include projected consolidated EBITDA attributable to fixed fee contracts acquired in the acquisition of the COLT Hub; (ii) increase the maximum total leverage ratio to 5.50 to 1.0 for any two consecutive fiscal quarters ending on or immediately after the date of the consummation of a permitted acquisition in excess of $50 million; and (iii) add a senior secured leverage ratio of 3.75 to 1.0 on and after the cumulative issuance of $200 million or more of permitted junior debt.

The Company's outstanding balance on the Credit Facility amounted to $211.9 million and $416.5 million at March 31, 2013 and September 30, 2012, respectively. Outstanding standby letters of credit under the Credit Facility amounted to $2.0 million at March 31, 2013. As a result, the Company had approximately $386.1 million of remaining capacity at March 31, 2013, subject to compliance with any applicable covenants under such facility.

The Credit Facility contains various covenants and restrictive provisions that limit its ability to, among other things:

• incur additional debt;

• make distributions on or redeem or repurchase units;

• make certain investments and acquisitions;

• incur or permit certain liens to exist;

• enter into certain types of transactions with affiliates;

• merge, consolidate or amalgamate with another company; and

• transfer or otherwise dispose of assets.

If the Company fails to perform its obligations under these and other covenants, the lenders' credit commitment could be terminated and any outstanding borrowings, together with accrued interest, under the Credit Facility could be declared immediately due and payable. The Credit Facility also has cross default provisions that apply to any other material indebtedness of the Company.

Borrowings under the Credit Facility are generally secured by pledges of the equity interests in the Company's wholly owned subsidiaries, liens on substantially all of the Company's real and personal property, and guarantees issued by all of the Company's subsidiaries. Borrowings under the Credit Facility, other than swing line loans, will bear interest at its option at either:

• the Alternate Base Rate, which is defined as the highest of (i) the federal funds rate plus 0.50%; (ii) JP Morgan's prime rate; or (iii) the Adjusted LIBO Rate plus 1%; plus a margin varying from 0.75% to 1.75% depending on the Company's most recent total leverage ratio; or

18

INERGY MIDSTREAM, L.P.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(unaudited)

• the Adjusted LIBO Rate, which is defined as the LIBO Rate plus a margin varying from 1.75% to 2.75% depending on the Company's most recent total leverage ratio.

Swing line loans bear interest at the Alternate Base Rate plus a margin varying from 0.75% to 1.75%. The unused portion of the Credit Facility is subject to a commitment fee ranging from 0.30% to 0.50% per annum according to its most recent total leverage ratio. Interest on Alternative Base Rate loans is payable quarterly or, if the Adjusted LIBO Rate applies, it may be paid at more frequent intervals.

Senior Notes

On December 7, 2012, the Company and NRGM Finance Corp. (“Finance Corp.” and together with the Company, the “Issuers”) issued and sold $500 million in a private offering in aggregate principal amount of their 6.0% Senior Notes due 2020 (the “Notes”) pursuant to a purchase agreement dated November 29, 2012. The Issuers issued the Notes pursuant to an indenture dated as of December 7, 2012 (the “Indenture”), among the Issuers, the subsidiary guarantors and U.S. Bank National Association, as trustee. The Notes will mature on December 15, 2020. Interest on the Notes is payable semi-annually in arrears on June 15 and December 15 of each year, beginning on June 15, 2013. The Notes are guaranteed on a senior unsecured basis by the Company and all of the Company's existing subsidiaries (other than Finance Corp.) and certain of the Company's future subsidiaries. The Notes are fully and unconditionally guaranteed on a senior unsecured basis by all of the Company's existing subsidiaries (other than Finance Corp.) and certain of the Company's future subsidiaries, subject to the following customary release provisions:

(1)   a disposition of all or substantially all the assets of the guarantor subsidiary (including by way or merger or consolidation), to a third person, provided the disposition complies with the applicable indenture,

(2)   a disposition of the capital stock of the guarantor subsidiary to a third person, if the disposition complies with the applicable indenture and as a result the guarantor subsidiary ceases to be our subsidiary,

(3)   the designation by us of the guarantor subsidiary as an Unrestricted Subsidiary in accordance with the applicable indenture,

(4)   legal or covenant defeasance of such series of Senior Notes or satisfaction and discharge of the related indenture, or

(5)   the guarantor subsidiary ceases to guarantee any other indebtedness of ours or any other guarantor subsidiary, provided that it is then no longer an obligor with respect to any indebtedness under our credit facility.

The guarantees are joint and several. The Company has no independent assets or operations and NRGM Finance Corp. is a 100% finance subsidiary of the Company.

The Indenture restricts the Company's ability and the ability of its subsidiaries to: (i) sell assets; (ii) pay distributions on, redeem or repurchase the Company's units or redeem or repurchase its subordinated debt; (iii) make investments; (iv) incur or guarantee additional indebtedness or issue preferred units; (v) create or incur certain liens; (vi) enter into agreements that restrict distributions or other payments from the Company's restricted subsidiaries to the Company; (vii) consolidate, merge or transfer all or substantially all of the Company's assets; (viii) engage in transactions with affiliates; (ix) create unrestricted subsidiaries and (x) enter into sale and leaseback transactions. These covenants are subject to a number of important exceptions and qualifications. At any time when the Notes are rated investment grade by either of Moody’s Investors Service, Inc. or Standard & Poor’s Ratings Services and no Default or Event of Default (each as defined in the Indenture) has occurred and is continuing, many of these covenants will terminate.

Inergy and its wholly owned subsidiaries do not provide credit support or guarantee any amounts outstanding under the Credit Facility or Notes.

At March 31, 2013, the Company was in compliance with all of its debt covenants in the Credit Facility and Notes.

19

INERGY MIDSTREAM, L.P.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(unaudited)

Note 6 - Partners’ Capital

Common Units

On December 7, 2012, the Company  sold 10,714,283 newly issued common units at $21.00 per unit for a total purchase price of approximately $225 million pursuant to a Common Unit Purchase Agreement, dated November 3, 2012 (the “Common Unit Purchase Agreement”), between the the Company and the purchasers named therein. The issuance of the common units pursuant to the Common Unit Purchase Agreement was made in reliance upon an exemption from the registration requirements of the Securities Act, pursuant to Section 4(2) thereof. The Company filed a copy of the Common Unit Purchase Agreement as Exhibit 10.1 to the Current Report on Form 8-K filed by the Company on November 5, 2012.

Classes of Unitholders

The Company has three classes of unitholders which include a general partner, limited partners and IDR holders. The Company's partnership agreement requires that, within 45 days after the end of each quarter, beginning with the quarter ending December 31, 2011, the Company will distribute all available cash (as defined in the Company's partnership agreement) to common unitholders of record on the applicable record date. The general partner will not be entitled to distributions on its non-economic general partner interest. The IDRs are entitled to receive 50% of the cash distributed from operating surplus (as defined in the Company's partnership agreement) in excess of the initial quarterly distribution of $0.37.

Inergy, as the initial holder of the Company's IDRs, has the right under its partnership agreement to elect to relinquish the right to receive incentive distribution payments based on the initial quarterly distribution and to reset, at a higher level, the quarterly distribution amount (upon which the incentive distribution payments to Inergy would be set). If Inergy elects to reset the quarterly distribution, it will be entitled to receive a number of newly issued Company common units. The number of common units to be issued to Inergy will equal the number of common units that would have entitled the holder to the quarterly cash distribution in the prior quarter equal to the distribution to Inergy on the IDRs in such prior quarter. As the reset election has not been made, no additional units have been issued. For accounting purposes, diluted earnings per unit can be impacted, (even if the reset election has not been made), if the combined impact of issuing the additional units and resetting the cash target distribution is dilutive. Currently, diluted earnings per unit has not been impacted because the combined impact is antidilutive.

Quarterly Distributions of Available Cash

A summary of the Company’s limited partner quarterly distribution for the six months endedMarch 31, 2013 is presented below:

Six Months Ended March 31, 2013
Record Date	Payment Date	Per Unit Rate		Distribution Amount (in millions)
November 7, 2012	November 14, 2012	$	0.385	$	28.8
February 7, 2013	February 14, 2013	$	0.390	33.6
				$	62.4

During the six months endedMarch 31, 2013, the Company paid $2.9 million in IDRs to its general partner.

On April 25, 2013, the Company declared a distribution of $0.395 per limited partner unit to be paid on May 15, 2013, to unitholders of record on May 8, 2013 with respect to the second fiscal quarter of 2013. On May 15, 2012, the Company paid a distribution of $0.37 per limited partner unit to unitholders of record on May 8, 2012 with respect to the second fiscal quarter of 2012.

20

INERGY MIDSTREAM, L.P.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(unaudited)

Note 7 - Commitments and Contingencies

The Company has entered into certain purchase commitments in connection with the identified growth projects primarily related to the Watkins Glen NGL development project, the MARC I Pipeline, and certain upgrades to the US Salt facility. The Watkins Glen NGL development project entails the conversion of certain caverns created by US Salt into 2.1 million barrels of NGL storage.  The MARC I Pipeline, which was placed into service in December 2012, is a 39 mile, 30 inch bi-directional pipeline that extends between the Company's Stagecoach south lateral interconnect with Tennessee Gas Pipeline Company's 300 Line near its compressor station 319 and Transco's Leidy Line near its compressor station 517, and is capable of providing 550 MMcf/d of firm transportation capacity. At March 31, 2013, the total of these firm purchase commitments was $16.9 million and the purchases associated with these commitments are expected to occur over the next twelve months.

The Company is periodically involved in litigation proceedings. If the Company determines that a negative outcome is probable and the amount of loss is reasonably estimable, then it accrues the estimated amount. The results of litigation proceedings cannot be predicted with certainty; however, management believes that the Company does not have material potential liability in connection with these proceedings that would have a significant financial impact on its consolidated financial condition, results of operations or cash flows. However, the Company could incur judgments, enter into settlements or revise its expectations regarding the outcome of certain matters, and such developments could have a material adverse effect on the Company's results of operations or cash flows in the period in which the amounts are paid and/or accrued.

Any loss estimates are inherently subjective, based on currently available information, and are subject to management's judgment and various assumptions. Due to the inherently subjective nature of these estimates and the uncertainty and unpredictability surrounding the outcome of legal proceedings, actual results may differ materially from any amounts that have been accrued.

In June 2010, Inergy Midstream and CNYOG entered into a letter of intent with Anadarko Petroleum Corporation (“Anadarko”) which contemplated that, subject to certain conditions, Anadarko may exercise an option to acquire up to a 25% ownership interest in the MARC I pipeline. On September 23, 2011, Anadarko filed a complaint against the Company and CNYOG in the Court of Common Pleas in Lycoming County, Pennsylvania (Cause No. 11-01697) alleging that (i) Anadarko had an option to acquire, and timely exercised its option to acquire, a 25% ownership interest in the MARC I pipeline, (ii) the Company refused to enter into definitive agreements under which Anadarko would acquire a 25% interest in the pipeline and, by doing so, the Company breached the letter of intent, and (iii) by refusing to enter into definitive agreements, the Company breached a duty of good faith and fair dealing in connection with the letter of intent. Based on these allegations, Anadarko seeks various remedies, including specific performance of the letter of intent and monetary damages.   Inergy may be required to indemnify the Company for litigation related costs and damages under the omnibus agreement that governs the Company's relationship with Inergy.

The Company filed its answer to Anadarko's complaint on January 17, 2012 and discovery is ongoing. The Company believes that Anadarko's claims are without merit and intends to vigorously defend themselves in the lawsuit. Because this litigation is in the early stages of the proceedings, the Company is unable to estimate a reasonably possible loss or range of loss in this matter. Moreover, the Company believes that it has meritorious defenses that it intends to assert.

The Company utilizes third-party insurance subject to varying retention levels of self-insurance, which management considers prudent.

Note 8 - Related Party Transactions

The Company has recorded sales to Inergy of $3.3 million for each of the three months endedMarch 31, 2013 and 2012, and $6.7 million and $5.3 million for the six months endedMarch 31, 2013 and 2012, respectively. The sales relate to storage space leased at the Company's Bath storage facility. These sales increased the Company's net income by $2.2 million and $2.3 million for the three months endedMarch 31, 2013 and 2012, respectively, and $4.6 million and $3.4 million for the six months endedMarch 31, 2013 and 2012, respectively.

21

INERGY MIDSTREAM, L.P.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(unaudited)

At March 31, 2013, the Company had a $0.7 million payable to Inergy that is included in accrued expenses on the consolidated balance sheet. At September 30, 2012, the Company had a $0.3 million payable to Inergy that is included in accrued expenses on the consolidated balance sheet.

As discussed in Note 2, prior to the Company's IPO, Inergy funded certain of the Company's activities.

Note 9 - Segments

Effective with the acquisition of the COLT Hub, the Company's financial statements reflect three operating and reporting segments: (i) storage and transportation operations, (ii) salt operations and (iii) crude operations. The Company's storage and transportation operations include storage and transportation of natural gas and NGLs for third parties. The Company's salt operations include the production and sale of salt products. The Company's crude operations include the storage, loading and transportation of crude oil for third parties.

The identifiable assets associated with each reporting segment include accounts receivable and inventories. Revenues, gross profit, identifiable assets, goodwill, property, plant and equipment, total assets and expenditures for property, plant and equipment for each of the Company's reporting segments are presented below (in millions):

	Three Months Ended March 31, 2013
	Storage and Transportation Operations		Salt Operations		Crude Operations		Total
Firm storage revenues	$	23.6	$	—	$	—	$	23.6
Salt revenues	—		11.3		—		11.3
Crude revenues	—		—		10.9		10.9
Transportation revenues	15.7		—		—		15.7
Hub services revenues	2.3		—		—		2.3
Gross profit (excluding depreciation and amortization)	37.7		4.0		9.3		51.0
Identifiable assets	16.3		10.9		4.0		31.2
Goodwill	90		6.3		163.1		259.4
Property, plant and equipment	989.2		118.9		104.5		1,212.6
Total assets	938.6		113.0		418.9		1,470.5
Expenditures for property, plant and equipment	11.6		1.2		1.8		14.6

	Three Months Ended March 31, 2012
	Storage and Transportation Operations		Salt Operations		Crude Operations		Total
Firm storage revenues	$	23.5	$	—	$	—	$	23.5
Salt revenues	—		13.4		—		13.4
Transportation revenues	7.6		—		—		7.6
Hub services revenues	2.4		—		—		2.4
Gross profit (excluding depreciation and amortization)	30.5		5.4		—		35.9
Identifiable assets	11.9		10.5		—		22.4
Goodwill	90.2		6.3		—		96.5
Property, plant and equipment	794.9		112.4		—		907.3
Total assets	776.3		111.4		—		887.7
Expenditures for property, plant and equipment	51.1		1.6		—		52.7

22

INERGY MIDSTREAM, L.P.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(unaudited)

	Six Months Ended March 31, 2013
	Storage and Transportation Operations		Salt Operations		Crude Operations		Total
Firm storage revenues	$	47.2	$	—	$	—	$	47.2
Salt revenues	—		23.9		—		23.9
Crude revenues	—		—		13.7		13.7
Transportation revenues	23.9		—		—		23.9
Hub services revenues	5.5		—		—		5.5
Gross profit (excluding depreciation and amortization)	69.5		9.2		11.8		90.5
Identifiable assets	16.3		10.9		4.0		31.2
Goodwill	90.0		6.3		163.1		259.4
Property, plant and equipment	989.2		118.9		104.5		1,212.6
Total assets	938.6		113.0		418.9		1,470.5
Expenditures for property, plant and equipment	35.8		3.5		2.2		41.5

	Six Months Ended March 31, 2012
	Storage and Transportation Operations		Salt Operations		Crude Operations		Total
Firm storage revenues	$	46.4	$	—	$	—	$	46.4
Salt revenues	—		26.5		—		26.5
Transportation revenues	14.1		—		—		14.1
Hub services revenues	6.7		—		—		6.7
Gross profit (excluding depreciation and amortization)	60.6		11.0		—		71.6
Identifiable assets	11.9		10.5		—		22.4
Goodwill	90.2		6.3		—		96.5
Property, plant and equipment	794.9		112.4		—		907.3
Total assets	776.3		111.4		—		887.7
Expenditures for property, plant and equipment	87.5		2.9		—		90.4

Note 10 - Subsequent Events

The Company has identified subsequent events requiring disclosure through the date of the filing of this Form 10-Q.

On April 25, 2013, the Company declared a distribution of $0.395 per limited partner unit to be paid on May 15, 2013, to unitholders of record on May 8, 2013.

On May 5, 2013, Crestwood Holdings, LLC ("Crestwood Holdings") signed an agreement under which it will acquire the general partner of Inergy and Crestwood Holdings will contribute the ownership of Crestwood Midstream Partners LP's (NYSE:CMLP) ("CMLP") general partner and incentive distribution rights to Inergy in exchange for Inergy common units. Separately, under the agreement, CMLP would be merged with a subsidiary of Inergy Midstream in a merger in which CMLP unitholders would receive 1.07 units of Inergy Midstream for each unit of CMLP they own. Additionally, under the agreement, CMLP unaffiliated unitholders would receive a one-time $35 million cash payment at the closing of the merger, $25 million of which would be payable by Inergy Midstream and $10 million of which would be payable by Crestwood Holdings. The merger of Inergy Midstream and CMLP is conditioned upon the closing of Crestwood Holdings' acquisition of Inergy's general partner, the closing of the contribution of the CMLP general partner and incentive distribution rights to Inergy, and the approval of the holders of a majority of the limited partner interests of CMLP.

23

Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations

“Management’s Discussion and Analysis of Financial Condition and Results of Operations” should be read in conjunction with the accompanying consolidated financial statements.

The statements in this Quarterly Report on Form 10-Q that are not historical facts, including most importantly, those statements preceded by, or that include the words “believe,” “expect,” “may,” “will,” “should,” “could,” “anticipate,” “estimate,” “intend” or the negation thereof, or similar expressions, constitute “forward-looking statements” within the meaning of the Private Securities Litigation Reform Act of 1995 (“Reform Act”). Such forward-looking statements include, but are not limited to, our belief that we will complete our growth projects; our belief that we will have the capacity to fund internal growth projects and acquisitions; our belief that we will be able to generate stable cash flows; and our belief that Anadarko’s litigation claims are without merit. Such forward-looking statements involve risks, uncertainties and other factors which may cause the actual results, performance or achievements to be materially different from any future results, performance or achievements expressed or implied by such forward-looking statements. Such factors include, but are not limited to, the following: changes in general and local economic conditions; competitive conditions within our industry, including crude oil and natural gas production levels and prices; our ability to complete internal growth projects on time and on budget; the price and availability of debt and equity financing; the effects of existing and future governmental legislation and regulations; and natural disasters, weather-related delays, casualty losses and other matters beyond our control. We will not undertake and specifically decline any obligation to publicly release the result of any revisions to any forward-looking statements to reflect events or circumstances after the date of such statements or to reflect events or circumstances after anticipated or unanticipated events.

Overview

We are a predominantly fee-based, growth-oriented limited partnership that develops, acquires, owns and operates midstream energy assets. We own and operate natural gas and NGL storage and transportation facilities, a salt production business located in the Northeast region of the United States, and a crude oil loading and storage terminal in North Dakota. We own and operate four natural gas storage facilities that have an aggregate working gas storage capacity of approximately 41.0 Bcf; natural gas pipeline facilities with 905 MMcf/d of transportation capacity; a 1.5 million barrel NGL storage facility; US Salt, a leading solution mining and salt production company; and the COLT Hub, a crude oil distribution hub located in North Dakota.

Our primary business objective is to increase the cash distributions that we pay to our unitholders by growing our business through the development, acquisition and operation of additional midstream assets near production and demand centers. An integral part of our growth strategy is the continued development of our platform of interconnected natural gas assets in the Northeast that can be operated as an integrated storage and transportation hub. For example, because we believe storage and transportation customers value operating flexibility, we expect to increase the interconnectivity between our natural gas assets and third-party pipelines, thereby resulting in increased demand for our services. We also expect our growth strategy to reflect our desire to diversify our operations, in terms of both our geographic footprint and the type of midstream services we provide to customers. Our recent acquisition of the COLT Hub is consistent with these objectives.

Organic growth projects, including both expansions and greenfield development projects, have recently provided cost-effective options for us to grow our midstream infrastructure base. In general, purchasers of midstream infrastructure have paid relatively high prices (measured in terms of a multiple of EBITDA or another financial metric) to acquire midstream assets and operations in recent arms-length transactions. Although the prices paid for certain types of midstream assets are likely to remain robust for the foreseeable future, acquisitions will continue to permit us to gain access to new markets (with respect to geographic footprint and product offerings) and develop the scale required to grow our business quickly and successfully. We therefore expect to grow our business in the near term through both organic growth projects and acquisitions.

Our operations include (i) the storage and transportation of natural gas and NGLs, which are reported in our storage and transportation reporting segment, (ii) US Salt's production and wholesale distribution of evaporated salt products, which are reported in our salt reporting segment, and (iii) the COLT Hub operations, which are reported in our crude reporting segment. The cash flows from our storage and transportation operations are predominantly fee-based under one to ten year contracts with creditworthy counterparties and, therefore, are generally economically stable and not significantly affected in the short term by changing commodity prices, seasonality or weather fluctuations. The contract period for hub services is typically less than one year. The cash flows from our salt operations represent sales to creditworthy customers typically under contracts that are less than one year in duration, and these cash flows tend to be relatively stable and not subject to seasonal or cyclical variation due to the use of, and demand for salt products in everyday life. The cash flows from our crude operations represent sales to creditworthy customers typically under contracts that are multiple years in duration.

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A substantial percentage of our operating cash flows are generated by our natural gas storage operations. Our natural gas storage revenues are driven in large part by competition and demand for our storage capacity and deliverability. Demand for storage in the Northeast is projected to continue to be strong, driven by a shortage in storage capacity and a higher than average annual growth in natural gas demand. This demand growth is primarily driven by the natural gas-fired electric generation sector and conversion from petroleum-based fuels. Due to the high percentage of our cash flows generated by our natural gas storage operations, we have attempted to diversify our asset base recently by developing natural gas transportation assets and NGL storage assets.

Our ability to market available transportation capacity is impacted by supply and demand for natural gas, competition from other pipelines, natural gas price volatility, the price differential between physical locations on our pipeline systems (basis spreads), economic conditions, and other factors. Our transportation facilities have benefited from, and we expect our pipelines to continue to benefit from, the development of the Marcellus shale as a significant supply basin. As LDCs and other customers increasingly utilize short-haul transportation options to satisfy their transportation needs, we believe the location of our transportation assets relative to the Marcellus shale will enable us to realize additional benefits.

Our long-term profitability will be influenced primarily by (i) successfully executing our existing development projects and continuing to develop new organic growth projects in our markets; (ii) pursuing strategic acquisitions from third parties, including Inergy, to grow our business; (iii) contracting and re-contracting storage and transportation capacity with our customers; and (iv) managing increasingly difficult regulatory processes, particularly in permitting and approval proceedings at the federal and state levels.

How We Evaluate Our Operations

We evaluate our business performance on the basis of the following key measures:

• revenues derived from firm storage contracts and the percentage of physical capacity and / or deliverability sold; 

• revenues derived from transportation contracts and the percentage of physical capacity sold; 

• operating and administrative expenses; and 

• EBITDA and Adjusted EBITDA.

We do not utilize depreciation, depletion and amortization expense in our key measures because we focus our performance management on cash flow generation and our assets have long useful lives.

Firm Storage Contracts

A substantial percentage of our revenues are derived from storage services that we provide under firm contracts. We seek to maximize the portion of our physical capacity sold under firm contracts. To the extent that physical capacity that is contracted for firm service is not being fully utilized, we attempt to contract available capacity for interruptible service. The table below sets forth the percentage of operationally available physical capacity or deliverability sold under firm storage contracts, as of March 31, 2013: 

Storage Facility (Commodity)	Percentage  Contractually  Committed	Weighted-Average  Maturity  (Year)
Stagecoach (Natural Gas)	100%	2016
Thomas Corners (Natural Gas)	100%	2015
Seneca Lake (Natural Gas)	100%	2016
Steuben (Natural Gas)	100%	2017
Bath (NGL)(1)	100%	2016

(1) We have contracted 100% of our Bath storage facility to an affiliate, Inergy Services.

Transportation Contracts

The North-South Facilities, the MARC I Pipeline, and the East Pipeline provide material earnings to our operations. We will seek to maximize the portion of physical capacity sold on the pipelines under firm contracts. To the extent the physical capacity that is contracted for firm service is not being fully utilized, we plan to contract available capacity on an interruptible basis. Our existing transportation assets are 89% contracted and committed.

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Crude Contracts

A substantial majority of our revenues from the COLT Hub are derived from multi-year contracts with minimum throughput commitments. We seek to maximize the throughput capacity of the loading facility sold under contracts with a minimum throughput commitment, and sell the hub's available storage capacity under take-or-pay contracts to the extent storage capacity is not a bundled component of our customer's throughput contracts. As of March 31, 2013, 59% of the COLT Hub's rail loading capacity (98% after giving effect to contracted throughput increases described below) was sold under long-term take-or-pay contracts with minimum throughput commitments. A majority of current customer contracts for rail loading capacity increase through the duration of the contracts to where contractual rail loading commitments approximate the rail loading capacity of the facility.

Operating and Administrative Expenses

Operating and administrative expenses consist primarily of wages, repair and maintenance costs, and professional fees. With the exception of our COLT Hub, these expenses typically do not vary significantly based upon the amount of commodities that we store or transport. Operating and administrative expenses at our COLT Hub are more closely correlated to the quantity of crude oil loaded, stored or transported. We obtain in-kind fuel reimbursements from natural gas shippers in accordance with our FERC gas tariffs and individual contract terms. The timing of our expenditures may fluctuate with planned maintenance activities that take place during off-peak periods, and changes in regulation also impact our expenditures. In addition, fluctuations in project development costs are impacted by the level of development activity during a period. Our operating and administrative expenses have also increased following our initial public offering due to an increase in legal and accounting costs and related public company regulatory and compliance expenses.

EBITDA and Adjusted EBITDA

We define EBITDA as income before income taxes, plus net interest expense and depreciation and amortization expense. We define Adjusted EBITDA as EBITDA excluding the gain or loss on the disposal of assets, long-term incentive and equity compensation expense, reimbursement of certain costs by Inergy, L.P., and transaction costs. Inergy, L.P. is required to reimburse Inergy Midstream, L.P. for certain costs under the terms of the Omnibus Agreement entered into on December 31, 2011 in conjunction with the initial public offering of Inergy Midstream, L.P.Transaction costs are third-party professional fees and other costs that are incurred in conjunction with closing a transaction.

Adjusted EBITDA is a non-GAAP supplemental financial measure that management and external users of our financial statements, such as industry analysts, investors, lenders and rating agencies, may use to assess:

• our operating performance as compared to other publicly traded partnerships in the midstream energy industry, without regard to historical cost basis or financing methods;

• the ability of our assets to generate sufficient cash flow to make distributions to our common unitholders; 

• our ability to incur and service debt and fund capital expenditures; and

• the viability of acquisitions and other capital expenditure projects and the returns on investment in various opportunities.

EBITDA and Adjusted EBITDA should not be considered an alternative to net income, income before income taxes, cash flows from operating activities, or any other measure of financial performance calculated in accordance with GAAP, as those items are used to measure operating performance, liquidity and our ability to service debt obligations. We believe that EBITDA provides additional information for evaluating our ability to make distributions to our common unitholders and is presented solely as a supplemental measure. We believe that Adjusted EBITDA provides additional information for evaluating our financial performance without regard to our financing methods, capital structure and historical cost basis. You should not consider Adjusted EBITDA in isolation or as a substitute for analysis of our results as reported under GAAP. EBITDA and Adjusted EBITDA, as we define them, may not be comparable to EBITDA and Adjusted EBITDA or similarly titled measures used by other corporations or partnerships in our industry, thereby diminishing such measures' utility.

Recent Developments

On May 5, 2013, Crestwood Holdings, LLC ("Crestwood Holdings") signed an agreement under which it will acquire the general partner of Inergy and Crestwood Holdings will contribute the ownership of Crestwood Midstream Partners LP's (NYSE:CMLP) ("CMLP") general partner and incentive distribution rights to Inergy in exchange for Inergy common units. Separately, under the agreement, CMLP would be merged with a subsidiary of Inergy Midstream in a merger in which CMLP unitholders would receive 1.07 units of Inergy Midstream for each unit of CMLP they own. Additionally, under the agreement,

26

CMLP unaffiliated unitholders would receive a one-time $35 million cash payment at the closing of the merger, $25 million of which would be payable by Inergy Midstream and $10 million of which would be payable by Crestwood Holdings. The merger of Inergy Midstream and CMLP is conditioned upon the closing of Crestwood Holdings' acquisition of Inergy's general partner, the closing of the contribution of the CMLP general partner and incentive distribution rights to Inergy, and the approval of the holders of a majority of the limited partner interests of CMLP.

On October 11, 2012, the FERC authorized Arlington Storage Company, LLC (“ASC”) to acquire by merger the natural gas storage facility owned by Steuben Gas Storage Company.  On April 1, 2013, Steuben Gas Storage Company merged with and into ASC.  As a result of the merger, ASC now owns and operates our Thomas Corners, Seneca Lake and Steuben natural gas storage facilities and provides storage and transportation services for all three facilities under market-based authority.  ASC's ownership and operation of the Steuben and Thomas Corners storage facilities under the same FERC Gas Tariff effectively connects Thomas Corners to Dominion and connects Steuben to TGP and the Millennium Pipeline.  We continue to believe that having the ability to operate all three of these storage facilities under the same tariff will improve interconnectivity and increase the attractiveness of the services we offer to our customers.

Results of Operations

Three Months Ended March 31, 2013 Compared to Three Months Ended March 31, 2012

The following table summarizes the consolidated statement of operations components for the three months endedMarch 31, 2013 and 2012, respectively (in millions):

	Three Months Ended March 31,				Change
	2013		2012		In Dollars			Percentage
Revenues	$	63.8	$	46.9	$	16.9		36.0	%
Service/product related costs	12.8		11.0		1.8			16.4
Operating and administrative expenses	13.3		6.8		6.5			95.6
Depreciation and amortization	25.9		12.7		13.2			103.9
Operating income	11.8		16.4		(4.6		)	(28.0	)
Interest expense, net	8.6		—		8.6			*
Net income	$	3.2	$	16.4	$	(13.2	)	(80.5	)%

* Not meaningful

Revenue. Revenues for the three months endedMarch 31, 2013, were $63.8 million, an increase of $16.9 million, or 36.0%, from $46.9 million during the same three-month period in 2012.

Revenues from firm storage were $23.6 million for the three months endedMarch 31, 2013, an increase of $0.1 million, or 0.4%, from $23.5 million during the same three-month period in 2012.

Revenues from transportation were $15.7 million for the three months endedMarch 31, 2013, an increase of $8.1 million, or 106.6%, from $7.6 million during the same three-month period in 2012. Transportation revenues increased $8.8 million due to the placement into service of our MARC I Pipeline, partially offset by $0.7 million decrease due to non-renewal of certain capacity we held on TGP's 300 Line.

Revenues from hub services were $2.3 million for the three months endedMarch 31, 2013, a decrease of $0.1 million, or 4.2%, from $2.4 million during the same three-month period in 2012.

Revenues from salt were $11.3 million for the three months endedMarch 31, 2013, a decrease of $2.1 million, or 15.7%, from $13.4 million during the same three-month period in 2012.This decline in revenue is primarily associated with a decline in activity with a particular customer.

Revenues from crude were $10.9 million for the three months endedMarch 31, 2013. We acquired the COLT Hub in December 2012 and thus no revenues were generated in the prior period.

27

Service/Product Related Costs. Service and product related costs, including storage, transportation, salt costs and crude costs, for the three months endedMarch 31, 2013, were $12.8 million, an increase of $1.8 million, or 16.4%, from $11.0 million during the same three-month period in 2012.

Storage related costs were $2.8 million for the three months endedMarch 31, 2013, an increase of $1.2 million, or 75.0%, from $1.6 million during the same three-month period in 2012. Storage related costs increased $1.5 million due to compression related costs incurred primarily as a result of increased throughput through our North-South facilities and placing our MARC I Pipeline into service in December 2012.

Transportation related costs were $1.1 million for the three months endedMarch 31, 2013, a decrease of $0.3 million, or 21.4%, from $1.4 million during the same three-month period in 2012. Transportation related costs were primarily comprised of fixed costs for leasing transportation capacity on a non-affiliated interconnecting pipe. This decrease was due to the non-renewal of certain TGP transportation capacity held by us.

Salt related costs were $7.3 million for the three months endedMarch 31, 2013, a decrease of $0.7 million, or 8.8%, from $8.0 million during the same three-month period in 2012. This decline in cost is primarily associated with the decline in sales with a particular customer.

Crude related costs were $1.6 million for the three months endedMarch 31, 2013. We acquired the COLT Hub in December 2012 and thus crude related costs were not generated in the prior period.

Our storage related costs consist primarily of direct costs to run the storage and transportation facilities, including electricity, contractor and fuel costs. These costs are offset by any fuel-in-kind collections made during the period. Our salt related costs directly relate to the salt operations and the costs associated with this business. Our transportation related costs consist primarily of our costs to procure firm transportation capacity on certain pipelines. Our crude related costs consist primarily of our costs to operate the COLT Hub (namely rail terminal operations).

Operating and Administrative Expenses. Operating and administrative expenses were $13.3 million for the three months endedMarch 31, 2013, compared to $6.8 million during the same three-month period in 2012, an increase of $6.5 million, or 95.6%. Operating expenses increased $2.5 million due to an increase in unit based compensation expenses, $1.0 million for certain professional services expenses, $0.6 million in COLT Hub operating expenses as it was purchased in December 2012, and $0.3 million due to acquisition related expenses associated with COLT Hub. In addition operating and administrative costs have increased $1.2 million, namely due to increased personnel and insurance costs as a result of placing the MARC I Pipeline into service, and $0.6 million due to an increase in allocated administrative expenses from Inergy.

Depreciation and Amortization. Depreciation and amortization increased to $25.9 million for the three months endedMarch 31, 2013, from $12.7 million during the same three-month period in 2012. This $13.2 million, or 103.9%, increase is primarily due to placing our MARC I Pipeline into service in December 2012 and our acquisition of COLT Hub in December 2012, which increased depreciation and amortization by $4.1 million and $9.1 million, respectively.

Interest Expense. Interest expense was $8.6 million for the three months endedMarch 31, 2013. There was no net interest expense for the three months endedMarch 31, 2012 due to the fact that all interest was capitalized to projects.

Net Income. Net income for the three months endedMarch 31, 2013, was $3.2 million compared to net income of $16.4 million during the same three-month period in 2012. The $13.2 million, or 80.5%, decrease in net income was primarily attributable to increased operating and administrative costs and depreciation and amortization, partially offset by higher gross profit.

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EBITDA and Adjusted EBITDA. The following table summarizes EBITDA and Adjusted EBITDA for the three months endedMarch 31, 2013 and 2012, respectively (in millions): 

	Three Months Ended March 31,
	2013		2012
EBITDA:
Net income	$	3.2	$	16.4
Depreciation and amortization	25.9		12.7
Interest expense, net	8.6		—
EBITDA	$	37.7	$	29.1
Long-term incentive and equity compensation expense	3.4		0.9
Reimbursement of certain costs by Inergy, L.P. (a)	1.2		—
Transaction costs (b)	0.3		—
Adjusted EBITDA	$	42.6	$	30.0

	Three Months Ended March 31,
	2013			2012
EBITDA:
Net cash provided by operating activities	$	38.0		$	36.3
Net changes in working capital balances	(4.9		)	(6.0		)
Amortization of deferred financing costs	(0.6		)	(0.3		)
Interest expense, net	8.6			—
Long-term incentive and equity compensation expense	(3.4		)	(0.9		)
EBITDA	$	37.7		$	29.1
Long-term incentive and equity compensation expense	3.4			0.9
Reimbursement of certain costs by Inergy, L.P. (a)	1.2			—
Transaction costs (b)	0.3			—
Adjusted EBITDA	$	42.6		$	30.0

(a) Inergy, L.P. is required to reimburse Inergy Midstream, L.P. for certain costs under the terms of the Omnibus Agreement entered into on December 31, 2011 in conjunction with the initial public offering of Inergy Midstream, L.P.    

(b) Transaction costs are third party professional fees and other costs that are incurred in conjunction with closing a transaction.

Six Months EndedMarch 31, 2013 Compared to Six Months EndedMarch 31, 2012

The following table summarizes the consolidated statement of operations components for the six months endedMarch 31, 2013 and 2012, respectively (in millions):

	Six Months Ended March 31,				Change
	2013		2012		In Dollars			Percentage
Revenues	$	114.2	$	93.7	$	20.5		21.9	%
Service/product related costs	23.7		22.1		1.6			7.2
Operating and administrative expenses	25.0		12.9		12.1			93.8
Depreciation and amortization	41.1		24.7		16.4			66.4
Loss on disposal of assets	0.6		—		0.6			*
Operating income	23.8		34.0		(10.2		)	(30.0	)
Interest expense, net	14.1		—		14.1			*
Net income	$	9.7	$	34.0	$	(24.3	)	(71.5	)%

* Not meaningful

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Revenue. Revenues for the six months endedMarch 31, 2013, were $114.2 million, an increase of $20.5 million, or 21.9%, from $93.7 million during the same six-month period in 2012.

Revenues from firm storage were $47.2 million for the six months endedMarch 31, 2013, an increase of $0.8 million, or 1.7%, from $46.4 million during the same six-month period in 2012. NGL firm storage revenues increased $1.4 million due to the changes in the contracts and customer mix at our Bath facility, partially offset by a $0.6 million reduction of firm storage revenues at our Stagecoach storage facility.

Revenues from transportation were $23.9 million for the six months endedMarch 31, 2013, an increase of $9.8 million, or 69.5%, from $14.1 million during the same six-month period in 2012. Transportation revenues increased $2.9 million and $11.5 million due to the placement into service of our North-South Facilities and MARC I Pipeline, respectively, partially offset by a $4.7 million decrease due to non-renewal of certain capacity we held on TGP's 300 Line.

Revenues from hub services were $5.5 million for the six months endedMarch 31, 2013, a decrease of $1.2 million, or 17.9%, from $6.7 million during the same six-month period in 2012. This decrease is primarily a result of firm wheeling service shippers utilizing their firm capacity in lieu of interruptible capacity, thus reducing the volume of interruptible wheeling services compared to the prior year.

Revenues from salt were $23.9 million for the six months endedMarch 31, 2013, a decrease of $2.6 million, or 9.8%, from $26.5 million during the same six-month period in 2012. This decline in revenue is primarily associated with a decline in activity with a particular customer.

Revenues from crude were $13.7 million for the six months endedMarch 31, 2013. We acquired the COLT Hub in December 2012 and thus no revenues were generated in the prior period.

Service/Product Related Costs. Service and product related costs, including storage, transportation, salt costs and crude costs, for the six months endedMarch 31, 2013, were $23.7 million, an increase of $1.6 million, or 7.2%, from 22.1 million during the same six-month period in 2012.

Storage related costs were $5.0 million for the six months endedMarch 31, 2013, an increase of $1.5 million, or 42.9%, from $3.5 million during the same six-month period in 2012. Storage related costs increased $2.1 million due to compression related costs incurred primarily as a result of placing our North-South Facilities and MARC I Pipeline into service in December 2011 and December 2012, respectively.

Transportation related costs were $2.1 million for the six months endedMarch 31, 2013, a decrease of $1.0 million, or 32.3%, from $3.1 million during the same six-month period in 2012. Transportation related costs were primarily comprised of fixed costs for leasing transportation capacity on a non-affiliated interconnecting pipe. This decrease was due to the non-renewal of certain TGP transportation capacity held by us.

Salt related costs were $14.7 million for the six months endedMarch 31, 2013, a decrease of $0.8 million, or 5.2%, from $15.5 million during the same six-month period in 2012. This decline in cost is primarily associated with the decline in sales with a particular customer.

Crude related costs were $1.9 million for the six months endedMarch 31, 2013. We acquired the COLT Hub in December 2012 and thus crude related costs were not generated in the prior period.

Our storage related costs consist primarily of direct costs to run the storage and transportation facilities, including electricity, contractor and fuel costs. These costs are offset by any fuel-in-kind collections made during the period. Our salt related costs directly relate to the salt operations and the costs associated with this business. Our transportation related costs consist primarily of our costs to procure firm transportation capacity on certain pipelines. Our crude related costs consist primarily of our costs to operate the COLT Hub (namely rail terminal operations).

Operating and Administrative Expenses. Operating and administrative expenses were $25.0 million for the six months endedMarch 31, 2013, compared to $12.9 million during the same six-month period in 2012, an increase of $12.1 million, or 93.8%. Operating expenses increased $4.2 million due to an increase in unit based compensation expenses, $2.9 million due to acquisition related expenses associated with the COLT Hub and $0.8 million in COLT Hub operating expenses as it was purchased in December 2012. In addition operating and administrative costs have increased $1.8 million, namely due to increased personnel and insurance costs as a result of placing the MARC I Pipeline into service, and $0.9 million due to an increase in allocated administrative expenses from Inergy.

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Depreciation and Amortization. Depreciation and amortization increased to $41.1 million for the six months endedMarch 31, 2013, from $24.7 million during the same six-month period in 2012. This $16.4 million, or 66.4%, increase is primarily due to placing our MARC I Pipeline and North-South Facilities into service in December 2012 and December 2011, respectively and our acquisition of the COLT Hub in December 2012, which increased depreciation and amortization by $5.3 million, $0.8 million, and $10.3 million, respectively.

Interest Expense. Interest expense was $14.1 million for the six months endedMarch 31, 2013. There was no net interest expense for the six months endedMarch 31, 2012 due to the fact that all interest was capitalized to projects.

Net Income. Net income for the six months endedMarch 31, 2013, was $9.7 million compared to net income of $34.0 million during the same six-month period in 2012. The $24.3 million, or 71.5%, decrease in net income was primarily attributable to increased operating and administrative costs and depreciation and amortization, partially offset by higher revenue.

EBITDA and Adjusted EBITDA. The following table summarizes EBITDA and Adjusted EBITDA for the six months endedMarch 31, 2013 and 2012, respectively (in millions): 

	Six Months Ended March 31,
	2013		2012
EBITDA:
Net income	$	9.7	$	34.0
Depreciation and amortization	41.1		24.7
Interest expense, net	14.1		—
EBITDA	$	64.9	$	58.7
Long-term incentive and equity compensation expense	6.0		1.8
Loss on disposal of assets	0.6		—
Reimbursement of certain costs by Inergy, L.P. (a)	1.2		—
Transaction costs (b)	2.9		—
Adjusted EBITDA	$	75.6	$	60.5

	Six Months Ended March 31,
	2013			2012
EBITDA:
Net cash provided by operating activities	$	60.2		$	68.2
Net changes in working capital balances	0.4			(7.4		)
Amortization of deferred financing costs	(3.2		)	(0.3		)
Interest expense, net	14.1			—
Long-term incentive and equity compensation expense	(6.0		)	(1.8		)
Loss on disposal of assets	(0.6		)	—
EBITDA	$	64.9		$	58.7
Long-term incentive and equity compensation expense	6.0			1.8
Loss on disposal of assets	0.6			—
Reimbursement of certain costs by Inergy, L.P. (a)	1.2			—
Transaction costs (b)	2.9			—
Adjusted EBITDA	$	75.6		$	60.5

(a) Inergy, L.P. is required to reimburse Inergy Midstream, L.P. for certain costs under the terms of the Omnibus Agreement entered into on December 31, 2011 in conjunction with the initial public offering of Inergy Midstream, L.P.    

(b) Transaction costs are third party professional fees and other costs that are incurred in conjunction with closing a transaction.

31

Liquidity and Sources of Capital

Cash Flows and Contractual Obligations

Net operating cash inflows were $60.2 million and $68.2 million for the six-month periods ended March 31, 2013 and 2012, respectively. The $8.0 million decrease in operating cash flows was primarily attributable to the increase in cash interest paid and increased operating expenses as a result of the placement into service of our North-South Facilities and MARC I Pipeline as well as our acquisition of the COLT Hub, partially offset by an increase in gross profit associated with the aforementioned capital projects and acquisition.

Net investing cash outflows were $502.6 million and $81.4 million for the six-month periods ended March 31, 2013 and 2012, respectively. Net cash outflows were primarily impacted by the acquisition of the COLT Hub in December 2012.

Net financing cash inflows were $442.7 million and $13.2 million for the six-month periods ended March 31, 2013 and 2012, respectively. The net change was primarily attributable to proceeds from the issuance of our senior unsecured notes and an issuance of common units in December 2012 to fund the acquisition of the COLT Hub.

We believe that anticipated cash from operations and borrowing capacity under our Credit Facility will be sufficient to meet our liquidity needs for the foreseeable future. If our plans or assumptions change or are inaccurate, or we make acquisitions, we may need to raise additional capital. While global financial markets and economic conditions have been disrupted and volatile in the past, the conditions have improved more recently. However, we give no assurance that we can raise additional capital to meet these needs. As of March 31, 2013, we have firm purchase commitments totaling approximately $16.9 million related to certain of these projects. Additional commitments or expenditures, if any, we may make toward any one or more of these projects are at the discretion of the Company. Any discontinuation of the construction of these projects will likely result in less future cash flow and earnings than we have indicated previously.

See Note 5 for a description of our Credit Facility and Senior Notes.

Item 3. Quantitative and Qualitative Disclosures About Market Risk

Interest Rate Risk

Our operating and acquisition activities were historically funded by Inergy. Interest was not historically charged on the funding of our activities except during periods of construction.

We have a $600 million revolving credit facility subject to the risk of loss associated with movements in interest rates. At March 31, 2013, we had floating rate obligations totaling $211.9 million under the Credit Facility. We may hedge portions of our borrowings under the Credit Facility from time to time. Floating rate obligations expose us to the risk of increased interest expense in the event of increases in short-term interest rates. We had no hedging instruments in place at March 31, 2013.

If the floating rate were to fluctuate by 100 basis points from March 2013 levels, our interest expenditures would change by a total of approximately $2.1 million per year.

Commodity Price, Market and Credit Risk

We do not take title to the natural gas, NGLs, or crude oil that we store, transport, or load for our customers and, accordingly, are not exposed to commodity price fluctuations on natural gas, NGLs, or crude oil stored in, transported by or loaded through our facilities. Except for the line pack and base gas we purchase and use in our natural gas storage and transportation facilities, which we consider to be a long-term asset, and volume and pricing variations related to small volumes of fuel-in-kind natural gas that we are entitled to retain from our customers as compensation for our fuel costs, our current business model is designed to minimize our exposure to fluctuations in commodity prices. As a result, absent other market factors that could adversely impact our operations, changes in the price of natural gas, NGLs or crude oil should not materially impact our operations.

32

Item 4. Controls and Procedures

We maintain controls and procedures designed to provide a reasonable assurance that information required to be disclosed in our reports that we file or submit under the Securities Exchange Act of 1934 are recorded, processed, summarized and reported within the time periods specified by the rules and forms of the SEC, and that information is accumulated and communicated to our management, including our Chief Executive Officer and Chief Financial Officer, as appropriate to allow timely decisions regarding required disclosure. An evaluation was performed under the supervision and with the participation of our management, including the Chief Executive Officer and the Chief Financial Officer, of the effectiveness of the design and operation of our disclosure controls and procedures (as such terms are defined in Rule 13a-15(e) and 15d-15(e) of the Exchange Act). Based upon that evaluation, management, including the Chief Executive Officer and the Chief Financial Officer, concluded that our disclosure controls and procedures were effective as of September 30, 2012, at the reasonable assurance level. There have been no changes in our internal control over financial reporting except as discussed below (as defined in Rule 13(a)-15(f) or Rule 15d-15(f) of the Exchange Act) during the period ended March 31, 2013, that have materially affected, or are reasonably likely to materially affect, our internal controls over financial reporting.

Changes in Internal Control over Financial Reporting

In fiscal 2013, we completed the acquisition of the COLT Hub. See Note 4 “Business Acquisitions” to the Consolidated Financial Statements included in Item 1 for a discussion of the acquisition and related financial data.

We are currently in the process of evaluating the internal controls and procedures of our current acquisition. Further, we are in the process of integrating their operations. Management will continue to evaluate our internal control over financial reporting as we execute integration activities; however, integration activities could materially affect our internal control over financial reporting in future periods.

33

PART II – OTHER INFORMATION

Item 1. Legal Proceedings

Part I, Item 1. Financial Statements, Note 7 to the Consolidated Financial Statements, of this Form 10-Q is hereby incorporated herein by reference.

Item 1A. Risk Factors

There have been no material changes to the risk factors disclosed in the Company's Quarterly Report on Form 10-Q for the period ended December 31, 2012.

Item 2. Unregistered Sales of Equity Securities and Use of Proceeds

None.

Item 3. Defaults Upon Senior Securities

None.

Item 4. Mine Safety Disclosures

Not applicable.

Item 5. Other Information

None.

34

Item 6. Exhibits

3.1	Certificate of Limited Partnership of Inergy Midstream, L.P. (incorporated by reference to Exhibit 3.4 to Inergy Midstream, L.P.'s Form S-1/A filed on November 21, 2011)
3.2	First Amended and Restated Agreement of Limited Partnership of Inergy Midstream, L.P., dated December 21, 2011
3.3	Certificate of Formation of NRGM GP, LLC (incorporated by reference to Exhibit 3.7 to Inergy Midstream, L.P.'s Form S-1/A filed on November 21, 2011)
3.4	Amended and Restated Limited Liability Company Agreement of NRGM GP, LLC, dated December 21, 2011 (incorporated by reference to Exhibit 3.2 to Inergy Midstream, L.P.'s Form 8-K filed on December 21, 2011)
4.1	Indenture, dated as of December 7, 2012, by and among Inergy Midstream, L.P., NRGM Finance Corp., the Guarantors party thereto and U.S. Bank National Association (incorporated by reference to Exhibit 4.1 to Inergy Midstream, L.P.'s Form 8-K filed on December 13, 2012)
4.2	Form of 6.0% Senior Notes due 2020 (incorporated by reference to Exhibit 4.2 to Inergy Midstream, L.P.'s Form 8-K filed on December 13, 2012)
4.3	Registration Rights Agreement, dated as of December 7, 2012, by and among Inergy Midstream, L.P., NRGM Finance Corp., the Guarantors named therein and the Initial Purchasers named therein (incorporated by reference to Exhibit 4.3 to Inergy Midstream, L.P.'s Form 8-K filed on December 13, 2012)
4.4	First Supplemental Indenture dated as of January 18, 2013, among Inergy Midstream, L.P., NRGM Finance Corp., and U.S. Bank National Association, as trustee
*31.1	Certification of Chief Executive Officer of Inergy Midstream, L.P. pursuant to Section 302 of the Sarbanes-Oxley Act of 2002
*31.2	Certification of Chief Financial Officer of Inergy Midstream, L.P. pursuant to Section 302 of the Sarbanes-Oxley Act of 2002
*32.1	Certification of Chief Executive Officer of Inergy Midstream, L.P. pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002
*32.2	Certification of Chief Financial Officer of Inergy Midstream, L.P. pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002
**101.INS	XBRL Instance Document
**101.SCH	XBRL Taxonomy Extension Schema Document
**101.CAL	XBRL Taxonomy Extension Calculation Linkbase Document
**101.LAB	XBRL Taxonomy Extension Label Linkbase Document
**101.PRE	XBRL Taxonomy Extension Presentation Linkbase Document
**101.DEF	XBRL Taxonomy Extension Definition Linkbase Document

* Filed herewith

** Pursuant to Rule 406T of Regulation S-T, the Interactive Data Files on Exhibit 101 hereto are deemed not filed or part of a registration statement or prospectus for purposes of Sections 11 or 12 of the Securities Act of 1933, as amended, are deemed not filed for purposes of Section 18 of the Securities and Exchange Act of 1934, as amended, and otherwise are not subject to liability under those sections.

35

SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

		INERGY MIDSTREAM, L.P.
		By:	NRGM GP, LLC
			(its general partner)
Date:	May 7, 2013	By:	/s/ MICHAEL J. CAMPBELL
			Michael J. Campbell
			Senior Vice President and Chief Financial Officer
			(Duly Authorized Officer and Principal Financial Officer)

36

EX-31.1

Exhibit 31.1

CERTIFICATIONS

I, John J. Sherman, certify that:

1.I have reviewed this quarterly report on Form 10-Q of Inergy Midstream, L.P. (the “registrant”);

2.Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3.Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4.The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over the financial reporting (as defined in Exchange Act Rules 13a-15(f)) for the registrant and have:

(a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5.The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of registrant’s board of directors (or persons performing the equivalent functions):

(a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

(b) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

Date: May 7, 2013

/s/    John J. Sherman        

John J. Sherman

President and Chief Executive Officer

EX-31.2

Exhibit 31.2

CERTIFICATIONS

I, Michael J. Campbell, certify that:

1.I have reviewed this quarterly report on Form 10-Q of Inergy Midstream, L.P. (the “registrant”);

2.Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3.Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4.The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over the financial reporting (as defined in Exchange Act Rules 13a-15(f)) for the registrant and have:

(a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5.The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of registrant’s board of directors (or persons performing the equivalent functions):

(a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

(b) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

Date: May 7, 2013

/s/    Michael J. Campbell

Michael J. Campbell

Senior Vice President and Chief Financial Officer

EX-32.1

Exhibit 32.1

Certification of the Chief Executive Officer

Pursuant to 18 U.S.C. Section 1350

As Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002

In connection with the Quarterly Report of Inergy Midstream, L.P. (the “Company”) on Form 10-Q for the period ended March 31, 2013, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, John J. Sherman, Chief Executive Officer of Inergy Midstream, L.P., certify, pursuant to 18 U.S.C. § 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

(1) The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2) The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

/s/ John J. Sherman

John J. Sherman

Chief Executive Officer

May 7, 2013

A signed original of this written statement required by Section 906, or other document authenticating, acknowledging, or otherwise adopting the signature that appears in typed form within the electronic version of this written statement required by Section 906, has been provided to the Company and will be retained by the Company and furnished to the Securities and Exchange Commission or its staff upon request.

EX-32.2

Exhibit 32.2

Certification of the Chief Financial Officer

Pursuant to 18 U.S.C. Section 1350

As Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002

In connection with the Quarterly Report of Inergy Midstream, L.P. (the “Company”) on Form 10-Q for the period ended March 31, 2013, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Michael J. Campbell, Chief Financial Officer of Inergy Midstream, L.P., certify, pursuant to 18 U.S.C. § 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

(1) The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2) The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

/s/ Michael J. Campbell

Michael J. Campbell

Chief Financial Officer

May 7, 2013

A signed original of this written statement required by Section 906, or other document authenticating, acknowledging, or otherwise adopting the signature that appears in typed form within the electronic version of this written statement required by Section 906, has been provided to the Company and will be retained by the Company and furnished to the Securities and Exchange Commission or its staff upon request.

XML

Commitments and Contingencies (Detail) (USD $) In Millions, unless otherwise specified		6 Months Ended		0 Months Ended	1 Months Ended
	Mar. 31, 2013	Mar. 31, 2013 Watkins Glen NGL Development Project bbl	Mar. 31, 2013 Marc I Pipeline mi in	Sep. 23, 2011 Marc I Pipeline Anadarko [Member]	Jun. 30, 2010 Marc I Pipeline Anadarko [Member]
Schedule Of Commitments And Contingencies [Line Items]
Barrels of NGL storage		2,100,000
Length of pipeline			39
Pipeline diameter			30
Expected transportation capacity of firm			550
Purchase commitments expected to occur over next twelve months	$ 16.9
Counterparty Option To Purchase Maximum Ownership Interest				25.00%	25.00%

XML

Certain Balance Sheet Information (Inventories) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Sep. 30, 2012
Balance Sheet Related Disclosures [Abstract]
Parts and supplies	$ 4.3	$ 4.2
Natural gas	0.4	0.4
Raw materials	0.3	0.2
Finished goods	0.7	0.8
Total inventories	$ 5.7	$ 5.6

XML

Organization and Basis of Presentation

6 Months Ended

Mar. 31, 2013

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Organization and Basis of Presentation

Organization and Basis of Presentation

Organization

Inergy Midstream, LLC was formed in September 2004 by Inergy, L.P. (“Inergy”) to acquire, develop, own and operate midstream energy assets. In connection with its initial public offering (“IPO”) of common units representing limited partnership interests, (i) Inergy Midstream, LLC converted into a Delaware limited partnership and changed its name to Inergy Midstream, L.P. (the “Company” or "Inergy Midstream") on November 14, 2011, and (ii) the Company transferred to Inergy 100% of its membership interest in two wholly owned subsidiaries (US Salt, LLC and Tres Palacios Gas Storage LLC) on November 25, 2011. The Company's common units began trading on the New York Stock Exchange (“NYSE”) on December 16, 2011 under the symbol “NRGM,” and the IPO closed on December 21, 2011.

Inergy owns all of the Company's Incentive Distribution Rights (“IDRs”) which entitle it to receive 50% of all distributions by the Company in excess of the initial quarterly distribution of $0.37 per unit. IDRs, which represent a limited partnership ownership interest in the Company, are considered to be participating securities because they have the right to participate in earnings with common equity holders. Under the Company's partnership agreement, IDRs participate in net income only to the extent of the amount of cash distributions actually declared, thereby excluding the IDRs from participating in undistributed earnings or losses. Accordingly, the undistributed net income is allocated to the other ownership interests on a pro-rata basis. Inergy indirectly owns the Company's general partnership interest, which entitles the general partner to management but no economic rights in the Company.

Nature of Operations

The Company's financial statements reflect three operating and reporting segments: storage and transportation operations, salt operations and crude operations. The Company's storage and transportation operations are engaged primarily in the storage and transportation of natural gas and natural gas liquids (“NGLs”). Its operations are currently concentrated in the Northeast region of the United States. The Company's salt operations, which are located in New York, include the production and sale of salt products by US Salt, LLC ("US Salt"). US Salt is one of five major solution mined salt manufacturers in the United States, producing evaporated salt products for food, industrial, pharmaceutical and water conditioning uses. The Company's crude operations, which were acquired in December 2012, include the COLT crude oil loading terminal, storage facility and interconnecting pipeline facilities ("COLT Hub") located in North Dakota. See Note 4 for additional information about this acquisition.

The Company owns and operates the following storage facilities:

• Stagecoach, a 26.25 Bcf multi-cycle depleted reservoir natural gas storage facility located approximately 150 miles northwest of New York City in Tioga County, New York and Bradford County, Pennsylvania;

• Thomas Corners, a 7.0 Bcf multi-cycle depleted reservoir natural gas storage facility located in Steuben County, New York;

• Steuben, a 6.2 Bcf single-turn depleted reservoir natural gas storage facility located in Steuben County, New York;

• Seneca Lake, a 1.45 Bcf multi-cycle salt dome reservoir natural gas storage facility located in Schuyler County, New York; and

• Bath, a 1.5 million barrel NGL storage facility located near Bath, New York.

The Company owns and operates natural gas transportation assets in the Northeast, including:

• the compression and appurtenant facilities installed to expand transportation capacity on the Stagecoach north and south laterals (the “North-South Facilities”), which provide 325 MMcf/d of firm interstate transportation service to shippers;

• the MARC I Pipeline, a 39-mile, 30-inch interstate natural gas pipeline that extends from the Company's Stagecoach south lateral interconnect with TGP's 300 Line and Transco's Leidy Line, and capable of providing 550 MMcf/d of firm transportation service to shippers; and

•the East Pipeline, a 37.5-mile, 12-inch diameter intrastate natural gas pipeline in New York.

The Company also owns US Salt, a solution mined salt production facility located on the shores of Seneca Lake outside of Watkins Glen, New York. The solution mining process used by US Salt creates salt caverns that can be developed into usable natural gas and NGL storage capacity.

In December 2012, the Company acquired the COLT Hub, which is strategically located near the town of Epping in Williams County, North Dakota, in the heart of the Bakken and Three Forks shale oil-producing areas. With 720,000 barrels of crude oil storage and two8,700-foot rail loops, the COLT Hub can accommodate 120-car unit trains and is capable of loading up to 120,000 barrels per day by rail. Customers can source product via gathering systems, an eight-bay truck unloading rack and the COLT Connector, a 21-mile, 10-inch bi-directional pipeline that connects the COLT Hub to the Enbridge and Tesoro crude pipelines at Dry Fork (Beaver Lodge/Ramberg junction). The COLT Hub is connected to the Banner crude gathering system and expects to connect to the Meadowlark Midstream (formerly, Bear Tracker Energy) and Hiland Pipeline crude gathering systems in fiscal 2013.

Basis of Presentation

The financial information contained herein as of March 31, 2013, and for the three-month and six-month periods endedMarch 31, 2013 and 2012, is unaudited. The Company believes this information has been prepared in accordance with accounting principles generally accepted in the United States for interim financial information and Article 10 of Regulation S-X. The Company also believes this information includes all adjustments (consisting only of normal recurring adjustments) necessary to present fairly the financial position, results of operations and cash flows for the periods then ended.

On May 14, 2012, the Company acquired 100% of the membership interests in US Salt from Inergy. The US Salt acquisition is reflected in the Company's consolidated financial statements based on the historical values, and periods prior to the acquisition have been retrospectively adjusted to include the historical balances of US Salt. This accounting treatment is similar to the pooling of interests and is required as the transaction is amongst entities under common control.

The accompanying consolidated financial statements include the accounts of Inergy Midstream, L.P. (formerly Inergy Midstream, LLC) and its wholly owned subsidiaries, including among others Arlington Storage Company, LLC (“Arlington”), Central New York Oil And Gas Company, L.L.C. (“CNYOG”), Finger Lakes LPG Storage, LLC (“Finger Lakes”), Inergy Gas Marketing, LLC, Inergy Pipeline East, LLC, US Salt, Inergy Crude Logistics, LLC (formerly Rangeland Energy, LLC), NRGM Finance Corp., and Inergy Storage, Inc.  All significant intercompany transactions, including distribution income, and balances have been eliminated in consolidation.

Prior to the completion of the IPO on December 21, 2011 the Company was a wholly owned subsidiary of Inergy.  The consolidated financial statements that are presented for the periods prior to the IPO have been prepared to represent the net assets and related historical results of the Company as if it were a stand-alone entity with the exception that the operations of Tres Palacios Gas Storage LLC (which was assigned to Inergy on November 25, 2011) has been excluded from the historical results.  The general ledger of each entity owned by the Company (excluding Tres Palacios Gas Storage LLC) forms the primary basis for the accompanying financial statements.  Costs incurred by Inergy which benefit both the Company and Inergy's wholly owned subsidiaries have been allocated in a manner described in “Allocation of Expenses” below.

Principles of Consolidation

The accompanying consolidated financial statements include the accounts of the Company and its subsidiaries. All significant intercompany balances and transactions have been eliminated in consolidation.

XML

Summary of Significant Accounting Policies (Estimated Useful Lives - Phantom) (Details)	6 Months Ended
	Mar. 31, 2013
Land, improvements and buildings | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful lives of Property, Plant and Equipment	15 years
Land, improvements and buildings | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful lives of Property, Plant and Equipment	25 years
Office furniture and equipment | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful lives of Property, Plant and Equipment	3 years
Office furniture and equipment | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful lives of Property, Plant and Equipment	7 years
Vehicles | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful lives of Property, Plant and Equipment	3 years
Vehicles | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful lives of Property, Plant and Equipment	5 years
Pipelines [Member] | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful lives of Property, Plant and Equipment	15 years
Pipelines [Member] | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful lives of Property, Plant and Equipment	15 years
Base gas | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful lives of Property, Plant and Equipment	10 years
Base gas | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful lives of Property, Plant and Equipment	10 years
Plant equipment | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful lives of Property, Plant and Equipment	3 years
Plant equipment | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful lives of Property, Plant and Equipment	20 years
Customer accounts | Minimum
Property, Plant and Equipment [Line Items]
Esitmated useful lives of identifiable intangible assets	15 years
Customer accounts | Maximum
Property, Plant and Equipment [Line Items]
Esitmated useful lives of identifiable intangible assets	20 years
Covenants not to compete | Minimum
Property, Plant and Equipment [Line Items]
Esitmated useful lives of identifiable intangible assets	3 years
Covenants not to compete | Maximum
Property, Plant and Equipment [Line Items]
Esitmated useful lives of identifiable intangible assets	5 years
Deferred financing costs | Minimum
Property, Plant and Equipment [Line Items]
Esitmated useful lives of identifiable intangible assets	5 years
Deferred financing costs | Maximum
Property, Plant and Equipment [Line Items]
Esitmated useful lives of identifiable intangible assets	8 years

XML

Certain Balance Sheet Information (Intangible Assets) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Sep. 30, 2012
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Gross	$ 211.7	$ 43.5
Less: accumulated amortization	24.3	14.2
Total intangible assets, net	187.4	29.3
Customer accounts
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Gross	191.2	38.3
Covenants not to compete
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Gross	4.4	0
Deferred financing and other costs
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Gross	$ 16.1	$ 5.2

XML

Business Acquisitions (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended						0 Months Ended	3 Months Ended	6 Months Ended			1 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013	Mar. 31, 2012		Dec. 07, 2012	Sep. 30, 2012	May 15, 2012	Dec. 07, 2012 Rangeland Energy, LLC [Member]	Mar. 31, 2012 Rangeland Energy, LLC [Member]	Mar. 31, 2013 Rangeland Energy, LLC [Member]	Mar. 31, 2012 Rangeland Energy, LLC [Member]	Dec. 07, 2012 Senior Unsecured Note Due 2020	Dec. 31, 2012 COLT Hub mi bbl	Mar. 31, 2013 COLT Hub truck_bays
Business Acquisition [Line Items]
Percentage of voting interests acquired								100.00%	100.00%
Purchase Price									$ 425
Private placement of common units									225
Debt Instrument, Face Amount													500
Crude oil storage capacity														720,000
Number of truck bays															8
Pipeline Length In Miles														21
Business Acquisition, Assets Acquired [Abstract]
Current assets						3.4
Property, plant and equipment						102.4
Intangible assets						157.4
Total identifiable assets acquired						263.2
Current liabilities						3.3
Total liabilities assumed						3.3
Net identifiable assets acquired						259.9
Goodwill	259.4	96.5	259.4	96.5		162.9	96.5
Net assets acquired						422.8
Business Acquisition, Pro Forma Information [Abstract]
Revenue										47.0	119.4	93.8
Net income										6.1	5.5	13.4
Basic (usd per unit)	$ 0.01	$ 0.18	$ 0.07	$ 0.20	[1]					$ 0.04	$ 0.02	$ (0.08)
Diluted (usd per unit)	$ 0.01	$ 0.18	$ 0.07	$ 0.20	[1]					$ 0.04	$ 0.02	$ (0.08)
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
2013											21.1
2014											29.3
2015											29.0
2016											21.8
2017 and thereafter											$ 12.4

[1] Retrospectively adjusted as described in Note 1.

XML

Long-Term Debt (Detail) (USD $)	6 Months Ended					6 Months Ended	1 Months Ended	6 Months Ended		6 Months Ended
	Mar. 31, 2013	Dec. 07, 2012	Sep. 30, 2012	Apr. 16, 2012	Dec. 21, 2011	Mar. 31, 2013 Minimum	Apr. 16, 2012 Maximum	Mar. 31, 2013 Maximum	Mar. 31, 2013 COLT Hub Minimum	Mar. 31, 2013 Credit Facility	Mar. 31, 2013 Swing Line Loans
Debt Instrument [Line Items]
Aggregate amount of revolving loan commitments	$ 600,000,000				$ 500,000,000
Credit facility, maturity date	December 2016
Increase in loan commitments	250,000,000
Sub-limit for swing line advances					10,000,000
Sub-limit for letters of credit					100,000,000
Line Of Credit Facility Increase In Borrowing Capacity				100,000,000
Increase in loan commitments under credit facility							150,000,000
Consolidated Leverage Ratio, Maximum, Post Acquisitions	5.50
Line of Credit Facility, Covenant Term, Acquisition Threshold									50,000,000
Senior Secured Leverage Ratio Maximum	3.75
Line of Credit Facility, Additional Capacity, Junior Debt	200,000,000
Outstanding balance on the credit facility	211,900,000		416,500,000
Letters of Credit Outstanding, Amount			2,000,000
Credit facility, remaining borrowing capacity			386,100,000
Debt Instrument, Interest Rate, Basis for Effective Rate	0.005
Debt Instrument, Interest Rate, Effective Percentage Rate Range, Minimum										0.75%	0.75%
Debt Instrument, Interest Rate, Effective Percentage Rate Range, Maximum										1.75%	1.75%
Adjusted LIBOR rate plus	1.00%
LIBOR Rate plus, Varying margin, minimum	1.75%
LIBOR Rate plus, Varying margin, maximum	2.75%
Commitment fee, percentage						0.30%		0.50%
Senior Notes	$ 500,000,000
Debt Instrument, Interest Rate, Stated Percentage		6.00%

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Certain Balance Sheet Information

6 Months Ended

Mar. 31, 2013

Balance Sheet Related Disclosures [Abstract]

Certain Balance Sheet Information

Certain Balance Sheet Information

Inventories

Inventories consisted of the following at March 31, 2013 and September 30, 2012, respectively (in millions):

	March 31, 2013		September 30, 2012
Parts and supplies	$	4.3	$	4.2
Natural gas	0.4		0.4
Raw materials	0.3		0.2
Finished goods	0.7		0.8
Total inventories	$	5.7	$	5.6

Property, Plant and Equipment

Property, plant and equipment consisted of the following at March 31, 2013 and September 30, 2012, respectively (in millions):

	March 31, 2013		September 30, 2012
Plant equipment	$	332.1	$	225.3
Salt deposits	41.6		41.6
Land and buildings	248.0		180.2
Pipelines	424.5		213.1
Vehicles	3.3		3.0
Construction in process	87.1		331.4
Base gas	73.5		73.1
Office furniture and equipment	2.5		1.0
	1,212.6		1,068.7
Less: accumulated depreciation	232.7		200.8
Total property, plant and equipment, net	$	979.9	$	867.9

Intangible Assets

Intangible assets consisted of the following at March 31, 2013 and September 30, 2012, respectively (in millions):

	March 31, 2013		September 30, 2012
Customer accounts	$	191.2	$	38.3
Covenants not to compete	4.4		—
Deferred financing and other costs	16.1		5.2
	211.7		43.5
Less: accumulated amortization	24.3		14.2
Total intangible assets, net	$	187.4	$	29.3

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Partners' Capital (Detail) (USD $) In Millions, except Share data, unless otherwise specified	0 Months Ended	3 Months Ended		6 Months Ended	0 Months Ended				6 Months Ended
	Dec. 07, 2012	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2013 Classes_of_Unitholders	Apr. 25, 2013 Subsequent event	May 15, 2012 Subsequent event	Apr. 25, 2013 Subsequent event Cash distribution	May 15, 2012 Subsequent event Cash distribution	Mar. 31, 2013 General Partner
Distribution Made to Member or Limited Partner [Line Items]
Partners' Capital Account, Units, Sale of Units	10,714,283
Partners' Capital Account, Sale of Units, Per Unit	21.00
Partners' Capital Account, Sale of Units	$ 225
Number of Classes of Unitholders				3
Maximum period for distribution of available cash after the end of each quarter				45 days
Percentage of cash distributions entitled to receive from operating surplus				50.00%
Disclosure Partners Capital Summary Of Quarterly Distributions Of Available Cash [Abstract]
Distribution to limited partner, record date		Feb. 07, 2013	Nov. 07, 2012			May 08, 2012	May 08, 2013
Distribution to limited partner, distribution date		Feb. 14, 2013	Nov. 14, 2012			May 15, 2012	May 15, 2013
Per unit rate		$ 0.390	$ 0.385					$ 0.37
Distribution amount		33.6	28.8	62.4
Incentive Distribution, Distribution									$ 2.9
Distribution Made to Member or Limited Partner, Declaration Date					Apr. 25, 2013
Distribution declared per limited partner unit				$ 0.37			$ 0.395

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CONSOLIDATED BALANCE SHEETS (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Sep. 30, 2012
Current assets:
Cash and cash equivalents	$ 0.3	$ 0
Accounts receivable	25.5	19.3
Inventories (Note 3):	5.7	5.6
Prepaid expenses and other current assets	9.4	5.4
Total current assets	40.9	30.3
Property, plant and equipment (Note 3):	1,212.6	1,068.7
Less: accumulated depreciation	232.7	200.8
Property, plant and equipment, net	979.9	867.9
Intangible assets (Note 3):
Customer accounts	191.2	38.3
Other intangible assets	20.5	5.2
Intangible Assets Gross Excluding Goodwill, Total	211.7	43.5
Less: accumulated amortization	24.3	14.2
Intangible assets, net	187.4	29.3
Goodwill	259.4	96.5
Other assets	2.9	3.9
Total assets	1,470.5	1,027.9
Current liabilities:
Accounts payable	2.8	3.9
Accrued expenses	23.6	51.4
Current portion of long-term debt (Note 5)	0.9	1.5
Total current liabilities	27.3	56.8
Long-term debt, less current portion (Note 5)	711.0	415.0
Other long-term liabilities	0.8	0.8
Partners’ capital (Note 6):
Limited partner unitholders (85,903,064 and 75,181,930 common units issued and outstanding at March 31, 2013 and September 30, 2012, respectively)	731.4	555.3
Total partners’ capital	731.4	555.3
Total liabilities and partners’ capital	$ 1,470.5	$ 1,027.9

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CONSOLIDATED STATEMENT OF PARTNERS' CAPITAL (USD $) In Millions, unless otherwise specified	6 Months Ended
	Mar. 31, 2013
Comprehensive income:
Beginning Balance	$ 555.3
Net proceeds from issuance of common units	224.5
Distributions to Inergy, L.P.	(46.6)
Distributions to external unitholders	(18.7)
Unit-based compensation charges	6.0
Partners Capital Account Contribution from Parent	(1.2)
Net income	9.7
Ending Balance	$ 731.4

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Segments (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013	Mar. 31, 2012		Dec. 07, 2012	Sep. 30, 2012
Segment Reporting Information [Line Items]
Firm storage revenues	$ 23.6	$ 23.5	$ 47.2	$ 46.4
Salt revenues	11.3	13.4	23.9	26.5	[1]
Crude revenues	10.9	0	13.7	0	[1]
Transportation revenues	15.7	7.6	23.9	14.1	[1]
Hub services revenue	2.3	2.4	5.5	6.7	[1]
Gross profit (excluding depreciation and amortization)	51.0	35.9	90.5	71.6
Identifiable assets	31.2	22.4	31.2	22.4
Goodwill	259.4	96.5	259.4	96.5		162.9	96.5
Property, plant and equipment	1,212.6	907.3	1,212.6	907.3			1,068.7
Total assets	1,470.5	887.7	1,470.5	887.7			1,027.9
Expenditures for property, plant and equipment	14.6	52.7	41.5	90.4
Storage and Transportation Operations
Segment Reporting Information [Line Items]
Firm storage revenues	23.6	23.5	47.2	46.4
Salt revenues	0	0	0	0
Crude revenues	0		0
Transportation revenues	15.7	7.6	23.9	14.1
Hub services revenue	2.3	2.4	5.5	6.7
Gross profit (excluding depreciation and amortization)	37.7	30.5	69.5	60.6
Identifiable assets	16.3	11.9	16.3	11.9
Goodwill	90.0	90.2	90.0	90.2
Property, plant and equipment	989.2	794.9	989.2	794.9
Total assets	938.6	776.3	938.6	776.3
Expenditures for property, plant and equipment	11.6	51.1	35.8	87.5
Salt Operations
Segment Reporting Information [Line Items]
Firm storage revenues	0	0	0	0
Salt revenues	11.3	13.4	23.9	26.5
Crude revenues	0		0
Transportation revenues	0	0	0	0
Hub services revenue	0	0	0	0
Gross profit (excluding depreciation and amortization)	4.0	5.4	9.2	11.0
Identifiable assets	10.9	10.5	10.9	10.5
Goodwill	6.3	6.3	6.3	6.3
Property, plant and equipment	118.9	112.4	118.9	112.4
Total assets	113.0	111.4	113.0	111.4
Expenditures for property, plant and equipment	1.2	1.6	3.5	2.9
Crude Operations
Segment Reporting Information [Line Items]
Firm storage revenues	0	0	0	0
Salt revenues	0	0	0	0
Crude revenues	10.9		13.7
Transportation revenues	0	0	0	0
Hub services revenue	0	0	0	0
Gross profit (excluding depreciation and amortization)	9.3	0	11.8	0
Identifiable assets	4.0	0	4.0	0
Goodwill	163.1	0	163.1	0
Property, plant and equipment	104.5	0	104.5	0
Total assets	418.9	0	418.9	0
Expenditures for property, plant and equipment	$ 1.8	$ 0	$ 2.2	$ 0

[1] Retrospectively adjusted as described in Note 1.

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Partners' Capital (Tables)

6 Months Ended

Mar. 31, 2013

Partners' Capital [Abstract]

Schedule of Distributions Made to Members or Limited Partners, by Distribution [Table Text Block]

A summary of the Company’s limited partner quarterly distribution for the six months endedMarch 31, 2013 is presented below:

Six Months Ended March 31, 2013
Record Date	Payment Date	Per Unit Rate		Distribution Amount (in millions)
November 7, 2012	November 14, 2012	$	0.385	$	28.8
February 7, 2013	February 14, 2013	$	0.390	33.6
				$	62.4

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Subsequent Events (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended	0 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2013	Apr. 25, 2013 Subsequent event	May 15, 2012 Subsequent event	Apr. 25, 2013 Cash distribution Subsequent event	May 05, 2013 Crestwood Holdings [Member] Subsequent event
Distribution Made to Member or Limited Partner [Line Items]
Distribution Made to Member or Limited Partner, Declaration Date				Apr. 25, 2013
Distribution declared per limited partner unit			$ 0.37			$ 0.395
Dividend payable date	Feb. 14, 2013	Nov. 14, 2012			May 15, 2012	May 15, 2013
Dividend record date	Feb. 07, 2013	Nov. 07, 2012			May 08, 2012	May 08, 2013
Equity Interest Issued or Issuable, Conversion Ratio							107.00%
Probably Aggregate Cash Payment							$ 35
Probable Aggregate Cash Payment by Parent							25
Probably Aggregate Cash Payment by Third Party							$ 10

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Organization and Basis of Presentation (Detail) (USD $)	1 Months Ended	6 Months Ended	12 Months Ended		6 Months Ended								1 Months Ended		1 Months Ended	6 Months Ended
	May 14, 2012	Mar. 31, 2013 segment	Sep. 30, 2012 Subsidiaries	May 15, 2012	Mar. 31, 2013 Stagecoach ft3	Mar. 31, 2013 Marc I Pipeline MMcf mi in	Mar. 31, 2013 Thomas Corners ft3	Mar. 31, 2013 Steuben ft3	Mar. 31, 2013 Seneca Lake ft3	Mar. 31, 2013 Bath bbl	Mar. 31, 2013 Stagecoach North And South Laterals MMcf	Mar. 31, 2013 New York mi in	Dec. 31, 2012 COLT Hub Boe bbl mi	Mar. 31, 2013 COLT Hub train_car_units truck_bays in	Nov. 25, 2011 US Salt LLC And Tres Palacios Gas Storage LLC	Mar. 31, 2013 Salt Products manufacturer	Mar. 31, 2013 Incentive distribution rights	Mar. 31, 2013 Railroad Transportation Equipment [Member] COLT Hub ft Transports
Partnership Organization And Basis Of Presentation [Line Items]
Limited partnership interest															100.00%
Number of ubsidiaries			2
Percentage of distribution entitled to receive		50.00%
Distribution declared per limited partner unit		$ 0.37															$ 0.37
Number of operating segments		3
Number of major entities in industry																5
Capacity of natural gas storage facility					26,250,000,000		7,000,000,000	6,200,000,000	1,450,000,000	1,500,000
Capacity of transportation service						550					325
Length of natural gas pipeline						39						37.5	21
Diameter of natural gas pipeline						30						12		10
Barrels of NGL storage													720,000
Property, Plant and Equipment, Gross																		2
Length of rail loops																		8,700
Number of car unit trains														120
Barrels of oil equivalents													120,000
Number of truck bays														8
Membership interests				100.00%
Effective date of acquisition	May 14, 2012

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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Millions, unless otherwise specified	6 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Operating activities
Net income	$ 9.7	$ 34.0	[1]
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	32.0	23.4	[1]
Amortization	9.1	1.3	[1]
Amortization of deferred financing costs	3.2	0.3	[1]
Unit-based compensation charges	6.0	1.8	[1]
Loss On Disposal Of Assets	0.6	0	[1]
Changes in operating assets and liabilities, net of effects from acquisitions:
Accounts receivable	(3.0)	(1.2)	[1]
Inventories	(0.1)	0	[1]
Prepaid expenses and other current assets	(2.2)	(2.8)	[1]
Other assets	1.0	0	[1]
Accounts payable and accrued expenses	3.5	0.2	[1]
Payable to Inergy, L.P.	0.4	11.2	[1]
Net cash provided by operating activities	60.2	68.2	[1]
Investing activities
Acquisitions, net of cash acquired	(424.5)	0	[1]
Purchases of property, plant and equipment	(78.1)	(81.4)	[1]
Net cash used in investing activities	(502.6)
Financing activities
Proceeds from the issuance of long-term debt	653.2	129.0
Principal payments on long-term debt	(357.8)	(32.0)
Distributions to Inergy, L.P.	(46.6)	(120.4)
Distributions to external unitholders	(18.7)	(0.7)
Principal payment on promissory note	0	(255.0)
Borrowings from related party	0	37.9
Contribution Of Capital From Parent	1.2	0
Payments to related party	0	(33.6)
Net proceeds from issuance of common units	224.5	292.7
Proceeds from (Payments for) Other Financing Activities	0	(0.1)
Payments for deferred financing costs	(13.1)	(4.6)
Net cash provided by financing activities	442.7	13.2
Net increase in cash	0.3	0
Cash at beginning of period	0	0
Cash at end of period	0.3	0
Supplemental schedule of noncash investing and financing activities
Net change to property, plant and equipment through accounts payable and accrued expenses	(36.6)	7.3
Net change to property, plant and equipment through non-cash capitalized interest	0	1.7
Extinguishment of indebtedness owed to Inergy, L.P.	0	152.8
Assumption of promissory note of Inergy, L.P. (Note 6)	0	255.0
Acquisitions, net of cash acquired:
Current assets	5.1	0
Property, plant and equipment	102.4	0
Intangible assets	157.4	0
Goodwill	162.9	0
Current liabilities	(3.3)	0
Total acquisitions, net of cash acquired	$ (424.5)	$ 0	[1]

[1] Retrospectively adjusted as described in Note 1.

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CONSOLIDATED BALANCE SHEETS (Parenthetical)	Mar. 31, 2013	Sep. 30, 2012
Statement of Financial Position [Abstract]
Common units, issued	85,903,064	75,181,930
Common units, outstanding	85,903,064	75,181,930

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Subsequent Events

6 Months Ended

Mar. 31, 2013

Subsequent Events [Abstract]

Subsequent Events

Subsequent Events

The Company has identified subsequent events requiring disclosure through the date of the filing of this Form 10-Q.

On April 25, 2013, the Company declared a distribution of $0.395 per limited partner unit to be paid on May 15, 2013, to unitholders of record on May 8, 2013.

On May 5, 2013, Crestwood Holdings, LLC ("Crestwood Holdings") signed an agreement under which it will acquire the general partner of Inergy and Crestwood Holdings will contribute the ownership of Crestwood Midstream Partners LP's (NYSE:CMLP) ("CMLP") general partner and incentive distribution rights to Inergy in exchange for Inergy common units. Separately, under the agreement, CMLP would be merged with a subsidiary of Inergy Midstream in a merger in which CMLP unitholders would receive 1.07 units of Inergy Midstream for each unit of CMLP they own. Additionally, under the agreement, CMLP unaffiliated unitholders would receive a one-time $35 million cash payment at the closing of the merger, $25 million of which would be payable by Inergy Midstream and $10 million of which would be payable by Crestwood Holdings. The merger of Inergy Midstream and CMLP is conditioned upon the closing of Crestwood Holdings' acquisition of Inergy's general partner, the closing of the contribution of the CMLP general partner and incentive distribution rights to Inergy, and the approval of the holders of a majority of the limited partner interests of CMLP.

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Document and Entity Information	6 Months Ended
	Mar. 31, 2013
Entity Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Entity Common Stock, Shares Outstanding
Document Period End Date	Mar. 31, 2013
Document Fiscal Year Focus	2013
Document Fiscal Period Focus	Q2
Trading Symbol	NRGM
Entity Registrant Name	INERGY MIDSTREAM, L.P.
Entity Central Index Key	0001304464
Current Fiscal Year End Date	--09-30
Entity Filer Category	Non-accelerated Filer

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Summary of Significant Accounting Policies (Policies)

6 Months Ended

Mar. 31, 2013

Accounting Policies [Abstract]

Revenue Recognition

Revenue Recognition

Revenue for natural gas and NGL firm storage is recognized ratably over the contract period regardless of the volume of natural gas or NGL stored by the Company's customers. Revenue from natural gas firm storage is affected to a lesser extent by volumes of stored gas received and or delivered by the Company's customers. Revenue for transportation services is recognized ratably over the contract period. Transportation revenue is derived from the sale of capacity that the Company has secured on certain third party pipelines, revenues for transportation on the East Pipeline and transportation revenue from placing the North-South Facilities and the MARC I Pipeline into service in the 2012 and 2013 fiscal years, respectively. Revenue from transportation services is also affected to a lesser extent by volumes of gas transported during the period. Revenue from hub services is recognized ratably over the contract period. Revenues from the sale of salt are recognized when product is shipped to the customer or when certain contractual performance requirements have otherwise been met. Revenues from the COLT Hub are recognized when the contractual services are provided, such as loading of customer rail cars.

Expense Classification

Expense Classification

Storage related costs consist of the direct costs to operate the storage and transportation facilities, including power, contractor and fuel costs. These costs support the revenue generated from firm storage, hub services and transportation services due to the intertwined nature of our assets. The Company's transportation related costs consist primarily of costs to procure firm transportation capacity on certain pipelines. Transportation related costs also consist of direct costs to operate the East Pipeline and the MARC I Pipeline. In limited instances, the Company may sell inventory obtained from fuel-in-kind collections. The cost basis of this inventory will be recorded in storage related costs. Operating and administrative expenses consist of all expenses incurred by the Company other than those described above in storage and transportation related costs and depreciation and amortization. Certain operating and administrative expenses and depreciation and amortization are incurred in providing storage services, but are not included in storage and transportation related costs. These amounts were $16.7 million and $11.2 million for the three months endedMarch 31, 2013 and 2012, respectively, and $29.7 million and $21.6 million for the six months endedMarch 31, 2013 and 2012, respectively.

Credit Risk and Concentrations

Credit Risk and Concentrations

Inherent in the Company's contractual portfolio are certain credit risks. Credit risk is the risk of loss from nonperformance by suppliers, customers or financial counterparties to a contract. Inergy takes an active role in managing credit risk and has established control procedures, which are reviewed on an ongoing basis. The Company attempts to minimize credit risk exposure through credit policies and periodic monitoring procedures as well as through customer deposits, letters of credit and entering into netting agreements that allow for offsetting counterparty receivable and payable balances for certain financial transactions, as deemed appropriate.

Use of Estimates

Use of Estimates

The preparation of consolidated financial statements in conformity with accounting principles generally accepted in the United States requires management to make estimates and assumptions that affect the reported amount of assets and liabilities and disclosure of contingent assets and liabilities at the date of the consolidated financial statements and the reported amounts of revenues and expenses during the periods presented. Actual results could differ from those estimates.

Inventories

Inventories

Inventories for storage and transportation operations, consisting primarily of natural gas, are stated at the lower of cost or market and are computed predominantly using the average cost method. Inventories for salt operations are stated at the lower of cost or market, cost being principally determined on the first-in, first-out method. All costs associated with the production of finished goods at the salt production facility are captured as inventory costs.

Property, Plant and Equipment

Property, Plant and Equipment

Property, plant and equipment are stated at historical cost less accumulated depreciation. The Company capitalizes all construction related direct labor and material costs as well as the cost of funds used during construction. Amounts capitalized for cost of funds used during construction amounted to $1.0 million and $1.1 million during the three months endedMarch 31, 2013, and 2012, respectively, and $2.3 million and $2.9 million during the six months endedMarch 31, 2013, and 2012, respectively. Depreciation is computed by the straight-line method over the estimated useful lives of the assets, as follows:

	Years
Buildings and improvements	15-25
Office furniture and equipment	3-7
Vehicles	3-5
Pipelines	15
Base gas	10
Plant equipment	3-20

Salt deposits are depleted on a unit of production method. Maintenance and repairs are charged to expense as incurred.

The Company reviews its long-lived assets for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. If such events or changes in circumstances are present, a loss is recognized if the carrying value of the asset is in excess of the sum of the undiscounted cash flows expected to result from the use of the asset and its eventual disposition. An impairment loss is measured as the amount by which the carrying amount of the asset exceeds the fair value of the asset. The Company has not identified any indicators that suggest the carrying amount of an asset may not be recoverable for the period ended March 31, 2013.

Identifiable Intangible Assets and Goodwill

Identifiable Intangible Assets

Intangible assets acquired in the acquisition of a business are required to be separately recognized if the benefit of the intangible asset is obtained through contractual or other legal rights, or if the intangible asset can be sold, transferred, licensed, rented or exchanged, regardless of the acquirer's intent to do so. Deferred financing costs represent financing costs incurred in obtaining financing and are being amortized over the term of the related debt.

The Company has recorded certain identifiable intangible assets, which are amortized on a straight-line basis over their estimated economic lives, as follows:

	Years
Customer accounts	15-20
Covenants not to compete	3-5
Deferred financing costs	5-8

Goodwill

Goodwill is recognized for various acquisitions by the Company as the excess of the cost of the acquisitions over the fair value of the related net assets at the date of acquisition. Goodwill is subject to at least an annual assessment for impairment by applying a fair-value-based test.

Income Taxes

Income Taxes

The Company and its majority unitholder, Inergy, are generally not subject to federal or state income tax. Therefore, the earnings of the Company are included in the federal and state income tax returns of its common unitholders and, as a result of Inergy's majority ownership interest in the Company, the limited partners of Inergy. Net earnings for financial statement purposes may differ significantly from taxable income reportable to unitholders as a result of differences between the tax basis and the financial reporting basis of assets and liabilities and the taxable income allocation requirements under the Company's partnership agreement.

Cash and Cash Equivalents

Cash and Cash Equivalents

The Company defines cash equivalents as all highly liquid investments with maturities of three months or less when purchased.

Income Per Unit

Income Per Unit

The Company calculates basic net income per limited partner unit by utilizing the two class method. Net income available to partners and the weighted-average number of units outstanding are presented only for the period subsequent to the IPO on December 21, 2011. Earnings (net income available to partners) of US Salt is presented only for the period subsequent to the acquisition on May 14, 2012. Basic and diluted net income per unit are the same, as there are no potentially dilutive units outstanding at March 31, 2013.

Fair Value

Fair Value

The carrying amounts of cash, accounts receivable and accounts payable approximate their fair value.

Transactions with Inergy and Inergy Propane, LLC

Transactions with Inergy

Inergy has historically provided the Company with funding to support its acquisition, capital expansion and working capital needs. The amounts provided by Inergy to finance acquisitions were considered to be permanent investments by Inergy and have accordingly been classified as parent company's investment on the consolidated financial statements of the Company. Amounts financed to support capital expansion and working capital needs, net of what the Company provided to Inergy were considered to be loans and were classified as payable to Inergy on the Company's consolidated financial statements. In connection with the Company's IPO on December 21, 2011, Inergy extinguished $152.8 million of indebtedness owed by the Company, which was treated as a capital contribution by Inergy.

Subsequent to the IPO, the Company used its revolving credit facility to finance acquisitions and its capital expansion and working capital needs.

Interest on intercompany loans provided by Inergy was historically charged on the loan balances during the period of construction of the Company's expansion projects.

Allocation of Expenses

Allocation of Expenses

The Company shares common management, operating and administrative and overhead costs with Inergy. The shared costs allocated to the Company totaled $5.0 million (including $3.0 million of unit-based compensation charges) and $2.3 million (including $0.9 million of unit-based compensation charges) for the three months endedMarch 31, 2013 and 2012, respectively, and $9.1 million (including $5.2 million of unit-based compensation charges) and $4.8 million (including $1.8 million of unit-based compensation charges) for the six months endedMarch 31, 2013 and 2012, respectively. In conjunction with its IPO, the Company entered into an Omnibus Agreement with Inergy that requires the Company to reimburse Inergy for all shared costs incurred on its behalf. Due to the nature of these shared costs, it is not practicable to estimate what the costs would have been on a stand-alone basis. Accordingly, the accompanying financial statements may not necessarily be indicative of the conditions that would have existed, or the results of operations that would have occurred, if the Company had operated as a stand-alone entity.

Comprehensive Income (Loss)

Comprehensive Income (Loss)

Comprehensive income includes net income and other comprehensive income. Other comprehensive income includes the realized loss on a derivative instrument that the Company entered into to hedge the purchase of base gas for one storage facility. The amount included in other comprehensive income associated with this derivative is being reclassified to earnings over the same period that the hedged base gas is recorded in earnings. The amount reclassified to earnings for the six-month period ended March 31, 2013

Property Tax Receivable

Property Tax Receivable

The Company receives property tax benefits under New York's Empire State Development program. The amounts due to be refunded to the Company under this program amounted to $4.9 million and $5.7 million as of March 31, 2013 and September 30, 2012, respectively. At March 31, 2013, $2.0 million of the amounts due to be refunded were classified in prepaid expenses and other current assets, and $2.9 million were classified in other long-term assets on the consolidated balance sheets. At September 30, 2012, $2.0 million of the amounts due to be refunded were classified in prepaid expenses and other current assets, and $3.7 million were classified in other long-term assets on the consolidated balance sheets.

Prepaid Property Taxes

Prepaid Property Taxes

The Company prepays property taxes in certain taxing jurisdictions and thus records the amount of taxes relating to future periods in prepaid expenses and other current assets, which totaled $2.4 million and $1.7 million at March 31, 2013 and September 30, 2012, respectively.

Contstruction Work in Process Accrual

Accrual

The Company has accrued for property, plant and equipment, including certain construction work in process relating to construction efforts on various growth projects. At March 31, 2013 the Company had accrued $8.5 million relating to property, plant and equipment, of which $7.9 million was classified as accrued expenses and $0.6 million was classified as accounts payable on the consolidated balance sheets. At September 30, 2012 the Company had accrued $45.1 million relating to property, plant and equipment, of which $44.1 million was classified as accrued expenses and $1.0 million was classified as accounts payable on the consolidated balance sheets.

Asset Retirement Obligations

Asset Retirement Obligations

An asset retirement obligation ("ARO") is an estimated liability for the cost to retire a tangible asset. The fair value of these AROs could not be made as settlement dates (or range of dates) associated with these assets were not estimable.

Accounting for Unit-Based Compensation

Accounting for Unit-Based Compensation

The Company has a unit-based employee compensation plan and all share-based payments to employees, including grants of employee stock options, are recognized in the income statement based on their fair values. The amount of compensation expense recorded by the Company during the three months endedMarch 31, 2013 was $3.4 million ($3.0 million allocated by Inergy for Inergy units and $0.4 million for Inergy Midstream units). The amount of compensation expense allocated to the Company during the three months endedMarch 31, 2012 was $0.9 million. The amount of compensation expense recorded by the Company during the six months endedMarch 31, 2013 was $6.0 million ($5.2 million allocated by Inergy for Inergy units and $0.8 million for Inergy Midstream units). The amount of compensation expense allocated to the Company during the six months endedMarch 31, 2012 was $1.8 million

Segment Information

Segment Information

There are certain accounting requirements that establish standards for reporting information about operating segments, as well as related disclosures about products and services, geographic areas and major customers. Further, they define operating segments as components of an enterprise for which separate financial information is available that is evaluated regularly by the chief operating decision maker in deciding how to allocate resources and assess performance. In determining its operating segments, the Company examined the way it organizes its business internally for making operating decisions and assessing business performance. See Note 9 for disclosures related to the Company's three operating and reporting segments.

Recently Issued Accounting Pronouncements

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CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013	Mar. 31, 2012
Revenue:
Firm storage	$ 20.3	$ 20.2	$ 40.5	$ 41.1	[1]
Transportation	15.7	7.6	23.9	14.1	[1]
Hub services	2.3	2.4	5.5	6.7	[1]
Related party firm storage (Note 8)	3.3	3.3	6.7	5.3	[1]
Salt	11.3	13.4	23.9	26.5	[1]
Crude	10.9	0	13.7	0	[1]
Revenues	63.8	46.9	114.2	93.7	[1]
Costs and expenses:
Storage related	2.8	1.6	5.0	3.5	[1]
Transportation related	1.1	1.4	2.1	3.1	[1]
Salt related	7.3	8.0	14.7	15.5	[1]
Crude related	1.6	0	1.9	0	[1]
Operating and administrative	13.3	6.8	25.0	12.9	[1]
Depreciation and amortization	25.9	12.7	41.1	24.7	[1]
Loss on disposal of assets	0	0	0.6	0	[1]
Costs and Expenses, Total	52.0	30.5	90.4	59.7	[1]
Operating income	11.8	16.4	23.8	34.0	[1]
Interest expense, net	8.6	0	14.1	0	[1]
Net income	3.2	16.4	9.7	34.0	[1]
Less: net income prior to initial public offering of Inergy Midstream, L.P.	0	0	0	12.9	[1]
Less: net income earned by US Salt, LLC prior to acquisition	0	3.0	0	6.2	[1]
Net income available to partners	3.2	13.4	9.7	14.9	[1]
Partners’ interest information:
Non-managing general partner interest in net income	2.2	0	3.9	0	[1]
Total limited partners’ interest in net income	$ 1.0		$ 5.8	$ 14.9	[1]
Net income per limited partner unit:
Basic (usd per unit)	$ 0.01	$ 0.18	$ 0.07	$ 0.20	[1]
Diluted (usd per unit)	$ 0.01	$ 0.18	$ 0.07	$ 0.20	[1]
Weighted-average limited partners’ units outstanding (in thousands):
Basic (units)	85,887	74,337	81,932	74,334	[1]
Diluted (units)	85,887	74,337	81,932	74,334	[1]

[1] Retrospectively adjusted as described in Note 1.

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Long-Term Debt

6 Months Ended

Mar. 31, 2013

Debt Disclosure [Abstract]

Long-Term Debt

Long-Term Debt

Credit Facility

On December 21, 2011, the Company entered into a new $500 million revolving credit facility (“Credit Facility”). The Credit Facility, which matures in December 2016, is available to fund acquisitions, working capital and internal growth projects and for general partnership purposes. The Credit Facility has an accordion feature that allows the Company to increase loan commitments by up to $250 million, subject to the lenders' agreement and the satisfaction of certain conditions. The Credit Facility includes a $10 million sub-limit for same-day swing line advances, and a $100 million sub-limit for letters of credit.

On April 16, 2012, the Company exercised a portion of its accordion feature under the Credit Facility and increased the loan commitments thereunder by $100 million and as a result, the accordion feature available to the Company is now $150 million. The aggregate amount of revolving loan commitments under the Credit Facility is now $600 million, and can be increased by up to $150 million, subject to the lenders' agreement and the satisfaction of certain conditions.

On November 16, 2012, the Company amended its revolving credit facility to, among other things, (i) amend the definition of consolidated EBITDA to include projected consolidated EBITDA attributable to fixed fee contracts acquired in the acquisition of the COLT Hub; (ii) increase the maximum total leverage ratio to 5.50 to 1.0 for any two consecutive fiscal quarters ending on or immediately after the date of the consummation of a permitted acquisition in excess of $50 million; and (iii) add a senior secured leverage ratio of 3.75 to 1.0 on and after the cumulative issuance of $200 million or more of permitted junior debt.

The Company's outstanding balance on the Credit Facility amounted to $211.9 million and $416.5 million at March 31, 2013 and September 30, 2012, respectively. Outstanding standby letters of credit under the Credit Facility amounted to $2.0 million at March 31, 2013. As a result, the Company had approximately $386.1 million of remaining capacity at March 31, 2013, subject to compliance with any applicable covenants under such facility.

The Credit Facility contains various covenants and restrictive provisions that limit its ability to, among other things:

• incur additional debt;

• make distributions on or redeem or repurchase units;

• make certain investments and acquisitions;

• incur or permit certain liens to exist;

• enter into certain types of transactions with affiliates;

• merge, consolidate or amalgamate with another company; and

• transfer or otherwise dispose of assets.

If the Company fails to perform its obligations under these and other covenants, the lenders' credit commitment could be terminated and any outstanding borrowings, together with accrued interest, under the Credit Facility could be declared immediately due and payable. The Credit Facility also has cross default provisions that apply to any other material indebtedness of the Company.

Borrowings under the Credit Facility are generally secured by pledges of the equity interests in the Company's wholly owned subsidiaries, liens on substantially all of the Company's real and personal property, and guarantees issued by all of the Company's subsidiaries. Borrowings under the Credit Facility, other than swing line loans, will bear interest at its option at either:

• the Alternate Base Rate, which is defined as the highest of (i) the federal funds rate plus 0.50%; (ii) JP Morgan's prime rate; or (iii) the Adjusted LIBO Rate plus 1%; plus a margin varying from 0.75% to 1.75% depending on the Company's most recent total leverage ratio; or

• the Adjusted LIBO Rate, which is defined as the LIBO Rate plus a margin varying from 1.75% to 2.75% depending on the Company's most recent total leverage ratio.

Swing line loans bear interest at the Alternate Base Rate plus a margin varying from 0.75% to 1.75%. The unused portion of the Credit Facility is subject to a commitment fee ranging from 0.30% to 0.50% per annum according to its most recent total leverage ratio. Interest on Alternative Base Rate loans is payable quarterly or, if the Adjusted LIBO Rate applies, it may be paid at more frequent intervals.

Senior Notes

On December 7, 2012, the Company and NRGM Finance Corp. (“Finance Corp.” and together with the Company, the “Issuers”) issued and sold $500 million in a private offering in aggregate principal amount of their 6.0% Senior Notes due 2020 (the “Notes”) pursuant to a purchase agreement dated November 29, 2012. The Issuers issued the Notes pursuant to an indenture dated as of December 7, 2012 (the “Indenture”), among the Issuers, the subsidiary guarantors and U.S. Bank National Association, as trustee. The Notes will mature on December 15, 2020. Interest on the Notes is payable semi-annually in arrears on June 15 and December 15 of each year, beginning on June 15, 2013. The Notes are guaranteed on a senior unsecured basis by the Company and all of the Company's existing subsidiaries (other than Finance Corp.) and certain of the Company's future subsidiaries. The Notes are fully and unconditionally guaranteed on a senior unsecured basis by all of the Company's existing subsidiaries (other than Finance Corp.) and certain of the Company's future subsidiaries, subject to the following customary release provisions:

(1)   a disposition of all or substantially all the assets of the guarantor subsidiary (including by way or merger or consolidation), to a third person, provided the disposition complies with the applicable indenture,

(2)   a disposition of the capital stock of the guarantor subsidiary to a third person, if the disposition complies with the applicable indenture and as a result the guarantor subsidiary ceases to be our subsidiary,

(3)   the designation by us of the guarantor subsidiary as an Unrestricted Subsidiary in accordance with the applicable indenture,

(4)   legal or covenant defeasance of such series of Senior Notes or satisfaction and discharge of the related indenture, or

(5)   the guarantor subsidiary ceases to guarantee any other indebtedness of ours or any other guarantor subsidiary, provided that it is then no longer an obligor with respect to any indebtedness under our credit facility.

The guarantees are joint and several. The Company has no independent assets or operations and NRGM Finance Corp. is a 100% finance subsidiary of the Company.

The Indenture restricts the Company's ability and the ability of its subsidiaries to: (i) sell assets; (ii) pay distributions on, redeem or repurchase the Company's units or redeem or repurchase its subordinated debt; (iii) make investments; (iv) incur or guarantee additional indebtedness or issue preferred units; (v) create or incur certain liens; (vi) enter into agreements that restrict distributions or other payments from the Company's restricted subsidiaries to the Company; (vii) consolidate, merge or transfer all or substantially all of the Company's assets; (viii) engage in transactions with affiliates; (ix) create unrestricted subsidiaries and (x) enter into sale and leaseback transactions. These covenants are subject to a number of important exceptions and qualifications. At any time when the Notes are rated investment grade by either of Moody’s Investors Service, Inc. or Standard & Poor’s Ratings Services and no Default or Event of Default (each as defined in the Indenture) has occurred and is continuing, many of these covenants will terminate.

Inergy and its wholly owned subsidiaries do not provide credit support or guarantee any amounts outstanding under the Credit Facility or Notes.

At March 31, 2013, the Company was in compliance with all of its debt covenants in the Credit Facility and Notes.

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Acquisitions

6 Months Ended

Mar. 31, 2013

Business Combinations [Abstract]

Business Acquisitions

Business Acquisitions

On December 7, 2012, the Company completed the acquisition of 100% of the ownership interest of Rangeland Energy, LLC in exchange for $425 million in cash, net of cash acquired in the transaction and subject to certain closing adjustments. Rangeland Energy, LLC was the owner and operator of the COLT Hub. Concurrently with the closing of the acquisition, the Company completed the private placement of $225 million common units and $500 million in senior unsecured notes due 2020. The remaining net proceeds from these offerings were used to repay borrowings under the Credit Facility.

The primary purpose of this acquisition was to acquire the integrated crude oil loading terminal, storage, and pipeline assets of Rangeland Energy, LLC and its subsidiaries, which are located in Williams County, North Dakota. The COLT Hub primarily consists of 720,000 barrels of crude oil storage, two8,700-foot rail loops, an eight-bay truck unloading rack, and a 21-mile bi-directional crude oil pipeline that connects the hub to gathering systems and interstate crude oil pipelines.

The following table summarizes the estimated fair values of the assets acquired and liabilities assumed at the acquisition date (in millions):

	December 7, 2012
Current assets	$	3.4
Property, plant and equipment	102.4
Intangible assets	157.4
Total identifiable assets acquired	263.2
Current liabilities	3.3
Total liabilities assumed	3.3
Net identifiable assets acquired	259.9
Goodwill	162.9
Net assets acquired	$	422.8

The $162.9 million of goodwill has been assigned to the crude segment. Goodwill recognized in the transaction relates primarily to expanding our geographic footprint into a new growing shale play. The name of the acquired entity has since been changed from Rangeland Energy, LLC to Inergy Crude Logistics, LLC. Based on the preliminary purchase price allocation, amortization expenses relative to the intangible assets acquired are expected to be $21.1 million, $29.3 million, $29.0 million, $21.8 million, and $12.4 million for the years ended September 30, 2013 through September 30, 2017, respectively.

The following represents the pro forma consolidated statements of operations as if the COLT Hub had been included in the consolidated results of the Company for the three-month period ended March 31, 2012 and for the full six-month periods ended March 31, 2013 and 2012 (in millions):

	(Unaudited) Pro Forma Consolidated Statement of Operations
	Three Months Ended March 31,		Six Months Ended March 31,
	2012		2013		2012
Revenue	$	47.0	$	119.4	$	93.8
Net income	$	6.1	$	5.5	$	13.4
Net income per limited partner unit:
Basic	$	0.04	$	0.02	$	(0.08	)
Diluted	$	0.04	$	0.02	$	(0.08	)

These amounts have been calculated after applying the Company's accounting policies and adjusting the results of Rangeland Energy, LLC to reflect the depreciation and amortization that would have been charged assuming the preliminary fair value adjustments to property, plant and equipment and intangible assets had been made at the beginning of the current period.  The purchase price allocation for this acquisition has been prepared on a preliminary basis pending final asset valuation and asset rationalization, and changes are expected when additional information becomes available. Accordingly, the purchase accounting adjustments made in connection with the development of the unaudited pro forma are preliminary and subject to change. The entities acquired were development stage entities (as defined by ASC Topic 915, Development Stage Entities) until commencing principal commercial operations in June 2012.

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Segments (Tables)

6 Months Ended

Mar. 31, 2013

Segment Reporting [Abstract]

Reportable Segments

Revenues, gross profit, identifiable assets, goodwill, property, plant and equipment, total assets and expenditures for property, plant and equipment for each of the Company's reporting segments are presented below (in millions):

	Three Months Ended March 31, 2013
	Storage and Transportation Operations		Salt Operations		Crude Operations		Total
Firm storage revenues	$	23.6	$	—	$	—	$	23.6
Salt revenues	—		11.3		—		11.3
Crude revenues	—		—		10.9		10.9
Transportation revenues	15.7		—		—		15.7
Hub services revenues	2.3		—		—		2.3
Gross profit (excluding depreciation and amortization)	37.7		4.0		9.3		51.0
Identifiable assets	16.3		10.9		4.0		31.2
Goodwill	90		6.3		163.1		259.4
Property, plant and equipment	989.2		118.9		104.5		1,212.6
Total assets	938.6		113.0		418.9		1,470.5
Expenditures for property, plant and equipment	11.6		1.2		1.8		14.6

	Three Months Ended March 31, 2012
	Storage and Transportation Operations		Salt Operations		Crude Operations		Total
Firm storage revenues	$	23.5	$	—	$	—	$	23.5
Salt revenues	—		13.4		—		13.4
Transportation revenues	7.6		—		—		7.6
Hub services revenues	2.4		—		—		2.4
Gross profit (excluding depreciation and amortization)	30.5		5.4		—		35.9
Identifiable assets	11.9		10.5		—		22.4
Goodwill	90.2		6.3		—		96.5
Property, plant and equipment	794.9		112.4		—		907.3
Total assets	776.3		111.4		—		887.7
Expenditures for property, plant and equipment	51.1		1.6		—		52.7

	Six Months Ended March 31, 2013
	Storage and Transportation Operations		Salt Operations		Crude Operations		Total
Firm storage revenues	$	47.2	$	—	$	—	$	47.2
Salt revenues	—		23.9		—		23.9
Crude revenues	—		—		13.7		13.7
Transportation revenues	23.9		—		—		23.9
Hub services revenues	5.5		—		—		5.5
Gross profit (excluding depreciation and amortization)	69.5		9.2		11.8		90.5
Identifiable assets	16.3		10.9		4.0		31.2
Goodwill	90.0		6.3		163.1		259.4
Property, plant and equipment	989.2		118.9		104.5		1,212.6
Total assets	938.6		113.0		418.9		1,470.5
Expenditures for property, plant and equipment	35.8		3.5		2.2		41.5

	Six Months Ended March 31, 2012
	Storage and Transportation Operations		Salt Operations		Crude Operations		Total
Firm storage revenues	$	46.4	$	—	$	—	$	46.4
Salt revenues	—		26.5		—		26.5
Transportation revenues	14.1		—		—		14.1
Hub services revenues	6.7		—		—		6.7
Gross profit (excluding depreciation and amortization)	60.6		11.0		—		71.6
Identifiable assets	11.9		10.5		—		22.4
Goodwill	90.2		6.3		—		96.5
Property, plant and equipment	794.9		112.4		—		907.3
Total assets	776.3		111.4		—		887.7
Expenditures for property, plant and equipment	87.5		2.9		—		90.4

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Certain Balance Sheet Information (Tables)

6 Months Ended

Mar. 31, 2013

Balance Sheet Related Disclosures [Abstract]

Components of Inventories

Inventories consisted of the following at March 31, 2013 and September 30, 2012, respectively (in millions):

	March 31, 2013		September 30, 2012
Parts and supplies	$	4.3	$	4.2
Natural gas	0.4		0.4
Raw materials	0.3		0.2
Finished goods	0.7		0.8
Total inventories	$	5.7	$	5.6

Components of Property, Plant and Equipment

Property, plant and equipment consisted of the following at March 31, 2013 and September 30, 2012, respectively (in millions):

	March 31, 2013		September 30, 2012
Plant equipment	$	332.1	$	225.3
Salt deposits	41.6		41.6
Land and buildings	248.0		180.2
Pipelines	424.5		213.1
Vehicles	3.3		3.0
Construction in process	87.1		331.4
Base gas	73.5		73.1
Office furniture and equipment	2.5		1.0
	1,212.6		1,068.7
Less: accumulated depreciation	232.7		200.8
Total property, plant and equipment, net	$	979.9	$	867.9

Components of Intangible Assets

Intangible assets consisted of the following at March 31, 2013 and September 30, 2012, respectively (in millions):

	March 31, 2013		September 30, 2012
Customer accounts	$	191.2	$	38.3
Covenants not to compete	4.4		—
Deferred financing and other costs	16.1		5.2
	211.7		43.5
Less: accumulated amortization	24.3		14.2
Total intangible assets, net	$	187.4	$	29.3

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Related Party Transactions

6 Months Ended

Mar. 31, 2013

Related Party Transactions [Abstract]

Related Party Transactions

Related Party Transactions

The Company has recorded sales to Inergy of $3.3 million for each of the three months endedMarch 31, 2013 and 2012, and $6.7 million and $5.3 million for the six months endedMarch 31, 2013 and 2012, respectively. The sales relate to storage space leased at the Company's Bath storage facility. These sales increased the Company's net income by $2.2 million and $2.3 million for the three months endedMarch 31, 2013 and 2012, respectively, and $4.6 million and $3.4 million for the six months endedMarch 31, 2013 and 2012, respectively.

At March 31, 2013, the Company had a $0.7 million payable to Inergy that is included in accrued expenses on the consolidated balance sheet. At September 30, 2012, the Company had a $0.3 million payable to Inergy that is included in accrued expenses on the consolidated balance sheet.

As discussed in Note 2, prior to the Company's IPO, Inergy funded certain of the Company's activities.

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Partners' Capital

6 Months Ended

Mar. 31, 2013

Partners' Capital [Abstract]

Partners' Capital

Partners’ Capital

Common Units

On December 7, 2012, the Company  sold 10,714,283 newly issued common units at $21.00 per unit for a total purchase price of approximately $225 million pursuant to a Common Unit Purchase Agreement, dated November 3, 2012 (the “Common Unit Purchase Agreement”), between the the Company and the purchasers named therein. The issuance of the common units pursuant to the Common Unit Purchase Agreement was made in reliance upon an exemption from the registration requirements of the Securities Act, pursuant to Section 4(2) thereof. The Company filed a copy of the Common Unit Purchase Agreement as Exhibit 10.1 to the Current Report on Form 8-K filed by the Company on November 5, 2012.

Classes of Unitholders

The Company has three classes of unitholders which include a general partner, limited partners and IDR holders. The Company's partnership agreement requires that, within 45 days after the end of each quarter, beginning with the quarter ending December 31, 2011, the Company will distribute all available cash (as defined in the Company's partnership agreement) to common unitholders of record on the applicable record date. The general partner will not be entitled to distributions on its non-economic general partner interest. The IDRs are entitled to receive 50% of the cash distributed from operating surplus (as defined in the Company's partnership agreement) in excess of the initial quarterly distribution of $0.37.

Inergy, as the initial holder of the Company's IDRs, has the right under its partnership agreement to elect to relinquish the right to receive incentive distribution payments based on the initial quarterly distribution and to reset, at a higher level, the quarterly distribution amount (upon which the incentive distribution payments to Inergy would be set). If Inergy elects to reset the quarterly distribution, it will be entitled to receive a number of newly issued Company common units. The number of common units to be issued to Inergy will equal the number of common units that would have entitled the holder to the quarterly cash distribution in the prior quarter equal to the distribution to Inergy on the IDRs in such prior quarter. As the reset election has not been made, no additional units have been issued. For accounting purposes, diluted earnings per unit can be impacted, (even if the reset election has not been made), if the combined impact of issuing the additional units and resetting the cash target distribution is dilutive. Currently, diluted earnings per unit has not been impacted because the combined impact is antidilutive.

Quarterly Distributions of Available Cash

A summary of the Company’s limited partner quarterly distribution for the six months endedMarch 31, 2013 is presented below:

Six Months Ended March 31, 2013
Record Date	Payment Date	Per Unit Rate		Distribution Amount (in millions)
November 7, 2012	November 14, 2012	$	0.385	$	28.8
February 7, 2013	February 14, 2013	$	0.390	33.6
				$	62.4

During the six months endedMarch 31, 2013, the Company paid $2.9 million in IDRs to its general partner.

On April 25, 2013, the Company declared a distribution of $0.395 per limited partner unit to be paid on May 15, 2013, to unitholders of record on May 8, 2013 with respect to the second fiscal quarter of 2013. On May 15, 2012, the Company paid a distribution of $0.37 per limited partner unit to unitholders of record on May 8, 2012 with respect to the second fiscal quarter of 2012.

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Commitments and Contingencies

6 Months Ended

Mar. 31, 2013

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

Commitments and Contingencies

The Company has entered into certain purchase commitments in connection with the identified growth projects primarily related to the Watkins Glen NGL development project, the MARC I Pipeline, and certain upgrades to the US Salt facility. The Watkins Glen NGL development project entails the conversion of certain caverns created by US Salt into 2.1 million barrels of NGL storage.  The MARC I Pipeline, which was placed into service in December 2012, is a 39 mile, 30 inch bi-directional pipeline that extends between the Company's Stagecoach south lateral interconnect with Tennessee Gas Pipeline Company's 300 Line near its compressor station 319 and Transco's Leidy Line near its compressor station 517, and is capable of providing 550 MMcf/d of firm transportation capacity. At March 31, 2013, the total of these firm purchase commitments was $16.9 million and the purchases associated with these commitments are expected to occur over the next twelve months.

The Company is periodically involved in litigation proceedings. If the Company determines that a negative outcome is probable and the amount of loss is reasonably estimable, then it accrues the estimated amount. The results of litigation proceedings cannot be predicted with certainty; however, management believes that the Company does not have material potential liability in connection with these proceedings that would have a significant financial impact on its consolidated financial condition, results of operations or cash flows. However, the Company could incur judgments, enter into settlements or revise its expectations regarding the outcome of certain matters, and such developments could have a material adverse effect on the Company's results of operations or cash flows in the period in which the amounts are paid and/or accrued.

Any loss estimates are inherently subjective, based on currently available information, and are subject to management's judgment and various assumptions. Due to the inherently subjective nature of these estimates and the uncertainty and unpredictability surrounding the outcome of legal proceedings, actual results may differ materially from any amounts that have been accrued.

In June 2010, Inergy Midstream and CNYOG entered into a letter of intent with Anadarko Petroleum Corporation (“Anadarko”) which contemplated that, subject to certain conditions, Anadarko may exercise an option to acquire up to a 25% ownership interest in the MARC I pipeline. On September 23, 2011, Anadarko filed a complaint against the Company and CNYOG in the Court of Common Pleas in Lycoming County, Pennsylvania (Cause No. 11-01697) alleging that (i) Anadarko had an option to acquire, and timely exercised its option to acquire, a 25% ownership interest in the MARC I pipeline, (ii) the Company refused to enter into definitive agreements under which Anadarko would acquire a 25% interest in the pipeline and, by doing so, the Company breached the letter of intent, and (iii) by refusing to enter into definitive agreements, the Company breached a duty of good faith and fair dealing in connection with the letter of intent. Based on these allegations, Anadarko seeks various remedies, including specific performance of the letter of intent and monetary damages.   Inergy may be required to indemnify the Company for litigation related costs and damages under the omnibus agreement that governs the Company's relationship with Inergy.

The Company filed its answer to Anadarko's complaint on January 17, 2012 and discovery is ongoing. The Company believes that Anadarko's claims are without merit and intends to vigorously defend themselves in the lawsuit. Because this litigation is in the early stages of the proceedings, the Company is unable to estimate a reasonably possible loss or range of loss in this matter. Moreover, the Company believes that it has meritorious defenses that it intends to assert.

The Company utilizes third-party insurance subject to varying retention levels of self-insurance, which management considers prudent.

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Segments

6 Months Ended

Mar. 31, 2013

Segment Reporting [Abstract]

Segments

Segments

Effective with the acquisition of the COLT Hub, the Company's financial statements reflect three operating and reporting segments: (i) storage and transportation operations, (ii) salt operations and (iii) crude operations. The Company's storage and transportation operations include storage and transportation of natural gas and NGLs for third parties. The Company's salt operations include the production and sale of salt products. The Company's crude operations include the storage, loading and transportation of crude oil for third parties.

The identifiable assets associated with each reporting segment include accounts receivable and inventories. Revenues, gross profit, identifiable assets, goodwill, property, plant and equipment, total assets and expenditures for property, plant and equipment for each of the Company's reporting segments are presented below (in millions):

	Three Months Ended March 31, 2013
	Storage and Transportation Operations		Salt Operations		Crude Operations		Total
Firm storage revenues	$	23.6	$	—	$	—	$	23.6
Salt revenues	—		11.3		—		11.3
Crude revenues	—		—		10.9		10.9
Transportation revenues	15.7		—		—		15.7
Hub services revenues	2.3		—		—		2.3
Gross profit (excluding depreciation and amortization)	37.7		4.0		9.3		51.0
Identifiable assets	16.3		10.9		4.0		31.2
Goodwill	90		6.3		163.1		259.4
Property, plant and equipment	989.2		118.9		104.5		1,212.6
Total assets	938.6		113.0		418.9		1,470.5
Expenditures for property, plant and equipment	11.6		1.2		1.8		14.6

	Three Months Ended March 31, 2012
	Storage and Transportation Operations		Salt Operations		Crude Operations		Total
Firm storage revenues	$	23.5	$	—	$	—	$	23.5
Salt revenues	—		13.4		—		13.4
Transportation revenues	7.6		—		—		7.6
Hub services revenues	2.4		—		—		2.4
Gross profit (excluding depreciation and amortization)	30.5		5.4		—		35.9
Identifiable assets	11.9		10.5		—		22.4
Goodwill	90.2		6.3		—		96.5
Property, plant and equipment	794.9		112.4		—		907.3
Total assets	776.3		111.4		—		887.7
Expenditures for property, plant and equipment	51.1		1.6		—		52.7

	Six Months Ended March 31, 2013
	Storage and Transportation Operations		Salt Operations		Crude Operations		Total
Firm storage revenues	$	47.2	$	—	$	—	$	47.2
Salt revenues	—		23.9		—		23.9
Crude revenues	—		—		13.7		13.7
Transportation revenues	23.9		—		—		23.9
Hub services revenues	5.5		—		—		5.5
Gross profit (excluding depreciation and amortization)	69.5		9.2		11.8		90.5
Identifiable assets	16.3		10.9		4.0		31.2
Goodwill	90.0		6.3		163.1		259.4
Property, plant and equipment	989.2		118.9		104.5		1,212.6
Total assets	938.6		113.0		418.9		1,470.5
Expenditures for property, plant and equipment	35.8		3.5		2.2		41.5

	Six Months Ended March 31, 2012
	Storage and Transportation Operations		Salt Operations		Crude Operations		Total
Firm storage revenues	$	46.4	$	—	$	—	$	46.4
Salt revenues	—		26.5		—		26.5
Transportation revenues	14.1		—		—		14.1
Hub services revenues	6.7		—		—		6.7
Gross profit (excluding depreciation and amortization)	60.6		11.0		—		71.6
Identifiable assets	11.9		10.5		—		22.4
Goodwill	90.2		6.3		—		96.5
Property, plant and equipment	794.9		112.4		—		907.3
Total assets	776.3		111.4		—		887.7
Expenditures for property, plant and equipment	87.5		2.9		—		90.4

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Related Party Transactions (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013	Mar. 31, 2012		Sep. 30, 2012
Related Party Transaction [Line Items]
Sales to Inergy	$ 3.3	$ 3.3	$ 6.7	$ 5.3	[1]
Increased in net income by sales relate to storage space leased	2.2	2.3	4.6	3.4
Inergy [Member]
Related Party Transaction [Line Items]
Sales to Inergy	3.3	3.3	6.7	5.3
Related party receivable	0.7		0.7
Related party accounts payable						$ 0.3

[1] Retrospectively adjusted as described in Note 1.

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Business Acquisitions (Tables)

6 Months Ended

Mar. 31, 2013

Business Combinations [Abstract]

Estimated Fair Value of Assets Acquired

The following table summarizes the estimated fair values of the assets acquired and liabilities assumed at the acquisition date (in millions):

	December 7, 2012
Current assets	$	3.4
Property, plant and equipment	102.4
Intangible assets	157.4
Total identifiable assets acquired	263.2
Current liabilities	3.3
Total liabilities assumed	3.3
Net identifiable assets acquired	259.9
Goodwill	162.9
Net assets acquired	$	422.8

Pro Forma Consolidated Statements of Operations

The following represents the pro forma consolidated statements of operations as if the COLT Hub had been included in the consolidated results of the Company for the three-month period ended March 31, 2012 and for the full six-month periods ended March 31, 2013 and 2012 (in millions):

	(Unaudited) Pro Forma Consolidated Statement of Operations
	Three Months Ended March 31,		Six Months Ended March 31,
	2012		2013		2012
Revenue	$	47.0	$	119.4	$	93.8
Net income	$	6.1	$	5.5	$	13.4
Net income per limited partner unit:
Basic	$	0.04	$	0.02	$	(0.08	)
Diluted	$	0.04	$	0.02	$	(0.08	)

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Certain Balance Sheet Information (Property Plant and Equipment) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Sep. 30, 2012	Mar. 31, 2012
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 1,212.6	$ 1,068.7	$ 907.3
Less: accumulated depreciation	232.7	200.8
Property, plant and equipment, net	979.9	867.9
Plant equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment	332.1	225.3
Salt deposits
Property, Plant and Equipment [Line Items]
Property, plant and equipment	41.6	41.6
Land and buildings
Property, Plant and Equipment [Line Items]
Property, plant and equipment	248.0	180.2
Pipelines [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment	424.5	213.1
Vehicles
Property, Plant and Equipment [Line Items]
Property, plant and equipment	3.3	3.0
Construction in process
Property, Plant and Equipment [Line Items]
Property, plant and equipment	87.1	331.4
Base gas
Property, Plant and Equipment [Line Items]
Property, plant and equipment	73.5	73.1
Office furniture and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 2.5	$ 1.0

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CONSOLIDATED STATMENTS OF COMPREHENSIVE INCOME (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013	Mar. 31, 2012
Net income	$ 3.2	$ 16.4	$ 9.7	$ 34.0	[1]
Change in unrealized fair value on cash flow hedges (Note 2)	0	0	0	0	[1]
Comprehensive income	$ 3.2	$ 16.4	$ 9.7	$ 34.0	[1]

[1] Retrospectively adjusted as described in Note 1.

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Summary of Significant Accounting Policies

6 Months Ended

Mar. 31, 2013

Accounting Policies [Abstract]

Summary of Significant Accounting Policies

Summary of Significant Accounting Policies

Revenue Recognition

Revenue for natural gas and NGL firm storage is recognized ratably over the contract period regardless of the volume of natural gas or NGL stored by the Company's customers. Revenue from natural gas firm storage is affected to a lesser extent by volumes of stored gas received and or delivered by the Company's customers. Revenue for transportation services is recognized ratably over the contract period. Transportation revenue is derived from the sale of capacity that the Company has secured on certain third party pipelines, revenues for transportation on the East Pipeline and transportation revenue from placing the North-South Facilities and the MARC I Pipeline into service in the 2012 and 2013 fiscal years, respectively. Revenue from transportation services is also affected to a lesser extent by volumes of gas transported during the period. Revenue from hub services is recognized ratably over the contract period. Revenues from the sale of salt are recognized when product is shipped to the customer or when certain contractual performance requirements have otherwise been met. Revenues from the COLT Hub are recognized when the contractual services are provided, such as loading of customer rail cars.

Expense Classification

Storage related costs consist of the direct costs to operate the storage and transportation facilities, including power, contractor and fuel costs. These costs support the revenue generated from firm storage, hub services and transportation services due to the intertwined nature of our assets. The Company's transportation related costs consist primarily of costs to procure firm transportation capacity on certain pipelines. Transportation related costs also consist of direct costs to operate the East Pipeline and the MARC I Pipeline. In limited instances, the Company may sell inventory obtained from fuel-in-kind collections. The cost basis of this inventory will be recorded in storage related costs. Operating and administrative expenses consist of all expenses incurred by the Company other than those described above in storage and transportation related costs and depreciation and amortization. Certain operating and administrative expenses and depreciation and amortization are incurred in providing storage services, but are not included in storage and transportation related costs. These amounts were $16.7 million and $11.2 million for the three months endedMarch 31, 2013 and 2012, respectively, and $29.7 million and $21.6 million for the six months endedMarch 31, 2013 and 2012, respectively.

Credit Risk and Concentrations

Inherent in the Company's contractual portfolio are certain credit risks. Credit risk is the risk of loss from nonperformance by suppliers, customers or financial counterparties to a contract. Inergy takes an active role in managing credit risk and has established control procedures, which are reviewed on an ongoing basis. The Company attempts to minimize credit risk exposure through credit policies and periodic monitoring procedures as well as through customer deposits, letters of credit and entering into netting agreements that allow for offsetting counterparty receivable and payable balances for certain financial transactions, as deemed appropriate.

One customer, ConEdison, accounted for approximately 10% and 14% of the Company's total revenue for the three months endedMarch 31, 2013 and 2012, respectively, and 12% and 14% of the Company's total revenue for the six months endedMarch 31, 2013 and 2012, respectively.  No other customer accounted for 10% or more of the Company's total revenue in those periods. All ConEdison revenues are captured in the storage and transportation segment.

Chesapeake Energy Corporation accounted for 14% of the Company's consolidated accounts receivable at March 31, 2013, and ConEdison accounted for 11% of the Company's consolidated accounts receivable at September 30, 2012.

Use of Estimates

The preparation of consolidated financial statements in conformity with accounting principles generally accepted in the United States requires management to make estimates and assumptions that affect the reported amount of assets and liabilities and disclosure of contingent assets and liabilities at the date of the consolidated financial statements and the reported amounts of revenues and expenses during the periods presented. Actual results could differ from those estimates.

Inventories

Inventories for storage and transportation operations, consisting primarily of natural gas, are stated at the lower of cost or market and are computed predominantly using the average cost method. Inventories for salt operations are stated at the lower of cost or market, cost being principally determined on the first-in, first-out method. All costs associated with the production of finished goods at the salt production facility are captured as inventory costs.

Property, Plant and Equipment

Property, plant and equipment are stated at historical cost less accumulated depreciation. The Company capitalizes all construction related direct labor and material costs as well as the cost of funds used during construction. Amounts capitalized for cost of funds used during construction amounted to $1.0 million and $1.1 million during the three months endedMarch 31, 2013, and 2012, respectively, and $2.3 million and $2.9 million during the six months endedMarch 31, 2013, and 2012, respectively. Depreciation is computed by the straight-line method over the estimated useful lives of the assets, as follows:

	Years
Buildings and improvements	15-25
Office furniture and equipment	3-7
Vehicles	3-5
Pipelines	15
Base gas	10
Plant equipment	3-20

Salt deposits are depleted on a unit of production method. Maintenance and repairs are charged to expense as incurred.

The Company reviews its long-lived assets for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. If such events or changes in circumstances are present, a loss is recognized if the carrying value of the asset is in excess of the sum of the undiscounted cash flows expected to result from the use of the asset and its eventual disposition. An impairment loss is measured as the amount by which the carrying amount of the asset exceeds the fair value of the asset. The Company has not identified any indicators that suggest the carrying amount of an asset may not be recoverable for the period ended March 31, 2013.

Identifiable Intangible Assets

Intangible assets acquired in the acquisition of a business are required to be separately recognized if the benefit of the intangible asset is obtained through contractual or other legal rights, or if the intangible asset can be sold, transferred, licensed, rented or exchanged, regardless of the acquirer's intent to do so. Deferred financing costs represent financing costs incurred in obtaining financing and are being amortized over the term of the related debt.

The Company has recorded certain identifiable intangible assets, which are amortized on a straight-line basis over their estimated economic lives, as follows:

	Years
Customer accounts	15-20
Covenants not to compete	3-5
Deferred financing costs	5-8

Goodwill

Goodwill is recognized for various acquisitions by the Company as the excess of the cost of the acquisitions over the fair value of the related net assets at the date of acquisition. Goodwill is subject to at least an annual assessment for impairment by applying a fair-value-based test.

The Company completed its annual impairment test for each of its reporting units and determined that no impairment existed as of September 30, 2012. No indicators of impairment were identified requiring an interim impairment test during the six-month period ended March 31, 2013.

Income Taxes

The Company and its majority unitholder, Inergy, are generally not subject to federal or state income tax. Therefore, the earnings of the Company are included in the federal and state income tax returns of its common unitholders and, as a result of Inergy's majority ownership interest in the Company, the limited partners of Inergy. Net earnings for financial statement purposes may differ significantly from taxable income reportable to unitholders as a result of differences between the tax basis and the financial reporting basis of assets and liabilities and the taxable income allocation requirements under the Company's partnership agreement.

Cash and Cash Equivalents

The Company defines cash equivalents as all highly liquid investments with maturities of three months or less when purchased.

Income Per Unit

The Company calculates basic net income per limited partner unit by utilizing the two class method. Net income available to partners and the weighted-average number of units outstanding are presented only for the period subsequent to the IPO on December 21, 2011. Earnings (net income available to partners) of US Salt is presented only for the period subsequent to the acquisition on May 14, 2012. Basic and diluted net income per unit are the same, as there are no potentially dilutive units outstanding at March 31, 2013.

Fair Value

The carrying amounts of cash, accounts receivable and accounts payable approximate their fair value. As of March 31, 2013, the estimated fair value of the Company's fixed-rate senior notes, based on available trading information, totaled $522.5 million compared with the aggregate principal amount at maturity of $500.0 million. The fair value of debt was determined based on market quotes from Bloomberg. At March 31, 2013, the Company's $600.0 million revolving credit facility had amounts outstanding of $211.9 million, which approximated fair value due primarily to the floating interest rate associated with borrowings under the credit facility.

Transactions with Inergy

Inergy has historically provided the Company with funding to support its acquisition, capital expansion and working capital needs. The amounts provided by Inergy to finance acquisitions were considered to be permanent investments by Inergy and have accordingly been classified as parent company's investment on the consolidated financial statements of the Company. Amounts financed to support capital expansion and working capital needs, net of what the Company provided to Inergy were considered to be loans and were classified as payable to Inergy on the Company's consolidated financial statements. In connection with the Company's IPO on December 21, 2011, Inergy extinguished $152.8 million of indebtedness owed by the Company, which was treated as a capital contribution by Inergy.

Subsequent to the IPO, the Company used its revolving credit facility to finance acquisitions and its capital expansion and working capital needs.

Interest on intercompany loans provided by Inergy was historically charged on the loan balances during the period of construction of the Company's expansion projects.

Allocation of Expenses

The Company shares common management, operating and administrative and overhead costs with Inergy. The shared costs allocated to the Company totaled $5.0 million (including $3.0 million of unit-based compensation charges) and $2.3 million (including $0.9 million of unit-based compensation charges) for the three months endedMarch 31, 2013 and 2012, respectively, and $9.1 million (including $5.2 million of unit-based compensation charges) and $4.8 million (including $1.8 million of unit-based compensation charges) for the six months endedMarch 31, 2013 and 2012, respectively. In conjunction with its IPO, the Company entered into an Omnibus Agreement with Inergy that requires the Company to reimburse Inergy for all shared costs incurred on its behalf. Due to the nature of these shared costs, it is not practicable to estimate what the costs would have been on a stand-alone basis. Accordingly, the accompanying financial statements may not necessarily be indicative of the conditions that would have existed, or the results of operations that would have occurred, if the Company had operated as a stand-alone entity.

Comprehensive Income (Loss)

Comprehensive income includes net income and other comprehensive income. Other comprehensive income includes the realized loss on a derivative instrument that the Company entered into to hedge the purchase of base gas for one storage facility. The amount included in other comprehensive income associated with this derivative is being reclassified to earnings over the same period that the hedged base gas is recorded in earnings. The amount reclassified to earnings for the six-month period ended March 31, 2013 was not material.

Property Tax Receivable

The Company receives property tax benefits under New York's Empire State Development program. The amounts due to be refunded to the Company under this program amounted to $4.9 million and $5.7 million as of March 31, 2013 and September 30, 2012, respectively. At March 31, 2013, $2.0 million of the amounts due to be refunded were classified in prepaid expenses and other current assets, and $2.9 million were classified in other long-term assets on the consolidated balance sheets. At September 30, 2012, $2.0 million of the amounts due to be refunded were classified in prepaid expenses and other current assets, and $3.7 million were classified in other long-term assets on the consolidated balance sheets.

Prepaid Property Taxes

The Company prepays property taxes in certain taxing jurisdictions and thus records the amount of taxes relating to future periods in prepaid expenses and other current assets, which totaled $2.4 million and $1.7 million at March 31, 2013 and September 30, 2012, respectively.

Property, Plant and Equipment Accrual

The Company has accrued for property, plant and equipment, including certain construction work in process relating to construction efforts on various growth projects. At March 31, 2013 the Company had accrued $8.5 million relating to property, plant and equipment, of which $7.9 million was classified as accrued expenses and $0.6 million was classified as accounts payable on the consolidated balance sheets. At September 30, 2012 the Company had accrued $45.1 million relating to property, plant and equipment, of which $44.1 million was classified as accrued expenses and $1.0 million was classified as accounts payable on the consolidated balance sheets.

Asset Retirement Obligations

An asset retirement obligation ("ARO") is an estimated liability for the cost to retire a tangible asset. The fair value of these AROs could not be made as settlement dates (or range of dates) associated with these assets were not estimable.

Accounting for Unit-Based Compensation

The Company has a unit-based employee compensation plan and all share-based payments to employees, including grants of employee stock options, are recognized in the income statement based on their fair values. The amount of compensation expense recorded by the Company during the three months endedMarch 31, 2013 was $3.4 million ($3.0 million allocated by Inergy for Inergy units and $0.4 million for Inergy Midstream units). The amount of compensation expense allocated to the Company during the three months endedMarch 31, 2012 was $0.9 million. The amount of compensation expense recorded by the Company during the six months endedMarch 31, 2013 was $6.0 million ($5.2 million allocated by Inergy for Inergy units and $0.8 million for Inergy Midstream units). The amount of compensation expense allocated to the Company during the six months endedMarch 31, 2012 was $1.8 million.

Segment Information

There are certain accounting requirements that establish standards for reporting information about operating segments, as well as related disclosures about products and services, geographic areas and major customers. Further, they define operating segments as components of an enterprise for which separate financial information is available that is evaluated regularly by the chief operating decision maker in deciding how to allocate resources and assess performance. In determining its operating segments, the Company examined the way it organizes its business internally for making operating decisions and assessing business performance. See Note 9 for disclosures related to the Company's three operating and reporting segments.

Recently Issued Accounting Pronouncements

On February 5, 2013, the FASB issued ASU No. 2013-02, “Reporting of Amounts Reclassified Out of Accumulated Other Comprehensive Income.” This ASU amends and clarifies the disclosure requirements prescribed in ASU No. 2011-05, “Comprehensive Income (Topic 220): Presentation of Comprehensive Income.” ASU No. 2013-02 requires that entities present information about reclassification adjustments from accumulated other comprehensive income in their annual financial statements in a single note or on the face of the financial statements. Public entities will also have to provide this information in their interim financial statements. Specifically, entities must present, either in a single note or parenthetically on the face of the financial statements, the effect of significant amounts reclassified from each component of accumulated other comprehensive income based on its source and the income statement line items affected by the reclassification. If a component is not required to be reclassified to net income in its entirety, entities would instead cross reference to the related footnote for additional information.  The Company will be subject to the requirements of ASU No. 2013-02 effective October 1, 2013, and the Company is currently reviewing the effect of this ASU.

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Summary of Significant Accounting Policies (Narrative) (Detail) (USD $)	3 Months Ended		6 Months Ended												6 Months Ended	3 Months Ended		6 Months Ended			12 Months Ended	3 Months Ended		6 Months Ended		3 Months Ended	6 Months Ended	3 Months Ended	6 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013 segment	Mar. 31, 2012	Sep. 30, 2012	Dec. 21, 2011	Mar. 31, 2013 Prepaid expenses and other current assets	Sep. 30, 2012 Prepaid expenses and other current assets	Mar. 31, 2013 Other long term assets	Sep. 30, 2012 Other long term assets	Mar. 31, 2013 Accrued Liabilities [Member]	Sep. 30, 2012 Accrued Liabilities [Member]	Mar. 31, 2013 Accounts payable	Sep. 30, 2012 Accounts payable	Mar. 31, 2013 Revenue	Mar. 31, 2013 Revenue Con Edison	Mar. 31, 2012 Revenue Con Edison	Mar. 31, 2013 Revenue Con Edison	Mar. 31, 2012 Revenue Con Edison	Mar. 31, 2013 Accounts Receivable Con Edison	Sep. 30, 2012 Accounts Receivable Con Edison	Mar. 31, 2013 Restricted units	Mar. 31, 2012 Restricted units	Mar. 31, 2013 Restricted units	Mar. 31, 2012 Restricted units	Mar. 31, 2013 Inergy [Member] Restricted units	Mar. 31, 2013 Inergy [Member] Restricted units	Mar. 31, 2013 Inergy Midstream Restricted units	Mar. 31, 2013 Inergy Midstream Restricted units	Mar. 31, 2013 Inergy [Member]	Mar. 31, 2013 Inergy [Member] Senior Notes [Member]
Significant Accounting Policies [Line Items]
Number of operating segments			3
Notes Payable, Fair Value Disclosure																															$ 522,500,000
Senior Notes	500,000,000		500,000,000																											500,000,000
Line of credit facility, maximum borrowing capacity	600,000,000		600,000,000			500,000,000
Operating and administrative expenses	16,700,000	11,200,000	29,700,000	21,600,000
Percentage of concentration of risk															10.00%	10.00%	14.00%	12.00%	14.00%	14.00%	11.00%
Amounts capitalized for cost of funds used in construction	1,000,000	1,100,000	2,300,000	2,900,000
Indebtedness extinguished			152,800,000
Operating, administrative and overhead cost	5,000,000	2,300,000	9,100,000	4,800,000
Unit-based compensation charges		900,000		1,800,000																		3,400,000	900,000	6,000,000	1,800,000	3,000,000	5,200,000	400,000	800,000
Amounts of Property Tax Receivable	4,900,000		4,900,000		5,700,000		2,000,000	2,000,000	2,900,000	3,700,000
Prepaid Taxes	2,400,000		2,400,000		1,700,000
Construction Payable	8,500,000		8,500,000		45,100,000						7,900,000	44,100,000	600,000	1,000,000
Outstanding balance on the credit facility	$ 211,900,000		$ 211,900,000		$ 416,500,000

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Summary of Significant Accounting Policies (Tables)

6 Months Ended

Mar. 31, 2013

Accounting Policies [Abstract]

Estimated Useful Lives of Assets

	Years
Buildings and improvements	15-25
Office furniture and equipment	3-7
Vehicles	3-5
Pipelines	15
Base gas	10
Plant equipment	3-20

Estimated Economic Lives of Identifiable Intangible Assets

	Years
Customer accounts	15-20
Covenants not to compete	3-5
Deferred financing costs	5-8