UNITED STATES
SECURITIES AND EXCHANGE COMMISSION

Washington, DC 20549

FORM N-Q

QUARTERLY SCHEDULE OF PORTFOLIO HOLDINGS OF REGISTERED
MANAGEMENT INVESTMENT COMPANIES

Investment Company Act File Number 811-499

RIVERSOURCE INCOME SERIES, INC.

(Exact name of registrant as specified in charter)

50606 Ameriprise Financial Center, Minneapolis, Minnesota	55474
(Address of principal executive offices)	(Zip code)

Scott R. Plummer — 5228 Ameriprise Financial Center, Minneapolis, MN 55474

(Name and address of agent for service)

Registrant’s telephone number, including area code: (612) 671-1947

Date of fiscal year end: January 31

Date of reporting period: October 31, 2010

Item 1. Schedule of Investments

Investments in Affiliated Funds
Columbia Income Builder Fund
Oct. 31, 2010 (Unaudited)

(Percentages represent value of investments compared to net assets)

Equity Funds (25.0%)

	Shares			Value(a)
Dividend Income (8.3%)
Columbia Dividend Opportunity Fund		2,590,937		$	19,354,298
International (1.0%)
RiverSource Disciplined International Equity Fund		315,949			2,338,019
Real Estate (2.2%)
RiverSource Real Estate Fund		471,025			5,077,650
U.S. Large Cap (9.0%)
Columbia Large Core Quantitative Fund		2,021,145			10,429,108
Columbia Large Value Quantitative Fund		1,226,385			10,448,803
Total					20,877,911
U.S. Small Cap (4.5%)
RiverSource Disciplined Small Cap Value Fund		1,246,516	(c)		10,483,198
Total Equity Funds (Cost: $55,708,740)				$	58,131,076

Fixed Income Funds (66.8%)

	Shares			Value(a)
Emerging Markets (4.7%)
Columbia Emerging Markets Bond Fund		931,388		$	10,887,931
Floating Rate (5.4%)
Columbia Floating Rate Fund		1,436,138			12,623,655
Global Bond (2.0%)
Columbia Global Bond Fund		619,608			4,634,668
High Yield (15.0%)
Columbia High Yield Bond Fund		11,416,330			31,851,561
Columbia Income Opportunities Fund		303,215			3,059,439
Total					34,911,000
Inflation Protected Securities (7.4%)
Columbia Inflation Protected Securities Fund		1,579,143			17,102,119
Investment Grade (32.3%)
Columbia Diversified Bond Fund		7,145,016			36,439,584
Columbia Limited Duration Credit Fund		401,804			4,054,200
Columbia U.S. Government Mortgage Fund		6,553,481	(c)		34,798,985
Total					75,292,769
Total Fixed Income Funds (Cost: $139,858,616)				$	155,452,142

Alternative Investments (4.4%)

	Shares			Value(a)
Columbia Absolute Return Currency and Income Fund		1,019,495	(b,c)	$	10,286,706
Total Alternative Investments (Cost: $10,166,919)				$	10,286,706

Cash Equivalents (3.4%)

	Shares		Value(a)
Money Market
Columbia Money Market Fund		7,821,443	$	7,821,443
Total Cash Equivalents (Cost: $7,821,443)			$	7,821,443
Total Investments in Affiliated Funds (Cost: $213,555,718)(d)			$	231,691,367

Notes to Investments in Affiliated Funds

(a)	Securities are valued by using policies described in Note 2 to the financial statements in the most recent Semiannual Report dated July 31, 2010.
(b)	Non-income producing.
(c)	The fund does not invest in underlying funds for the purpose of exercising management or control. At Oct. 31, 2010, the fund held the following positions, which exceed 5% of the underlying fund’s shares outstanding:

Underlying fund	Percent of shares held
RiverSource Disciplined Small Cap Value Fund		25.95	%
Columbia U.S. Government Mortgage Fund		14.02
Columbia Absolute Return Currency and Income Fund		6.00

(d) At Oct. 31, 2010, the cost of securities for federal income tax purposes was approximately $213,556,000 and the approximate aggregate gross unrealized appreciation and depreciation based on that cost was:

Unrealized appreciation	$	22,056,000
Unrealized depreciation		(3,921,000	)
Net unrealized appreciation	$	18,135,000

Fair Value Measurements

Generally accepted accounting principles (GAAP) require disclosure regarding the inputs and valuation techniques used to measure fair value and any changes in valuation inputs or techniques. In addition, investments shall be disclosed by major category.

The Fund categorizes its fair value measurements according to a three-level hierarchy that maximizes the use of observable inputs and minimizes the use of unobservable inputs by prioritizing that the most observable input be used when available. Observable inputs are those that market participants would use in pricing an investment based on market data obtained from sources independent of the reporting entity. Unobservable inputs are those that reflect the Fund’s assumptions about the information market participants would use in pricing an investment. An investment’s level within the fair value hierarchy is based on the lowest level of any input that is deemed significant to the asset or liability’s fair value measurement. The input levels are not necessarily an indication of the risk or liquidity associated with investments at that level. For example, certain U.S. government securities are generally high quality and liquid, however, they are reflected as Level 2 because the inputs used to determine fair value may not always be quoted prices in an active market.

Fair value inputs are summarized in the three broad levels listed below:

• Level 1 — Valuations based on quoted prices for investments in active markets that the Fund has the ability to access at the measurement date (to include NAV for open-end mutual funds). Valuation adjustments are not applied to Level 1 investments.

• Level 2 – Valuations based on other significant observable inputs (including quoted prices for similar securities, interest rates, prepayment speeds, credit risks, etc.).

• Level 3 – Valuations based on significant unobservable inputs (including the Fund’s own assumptions and judgment in determining the fair value of investments).

Inputs that are used in determining fair value of an investment may include price information, credit data, volatility statistics, and other factors. These inputs can be either observable or unobservable. The availability of observable inputs can vary between investments, and is affected by various factors such as the type of investment, and the volume and level of activity for that investment or similar investments in the marketplace. The inputs will be considered by the Fund Administrator, along with any other relevant factors in the calculation of an investment’s fair value. The Fund uses prices and inputs that are current as of the measurement date, which may include periods of market dislocations. During these periods, the availability of prices and inputs may be reduced for many investments. This condition could cause an investment to be reclassified between the various levels within the hierarchy.

Investments falling into the Level 3 category are primarily supported by quoted prices from brokers and dealers participating in the market for those investments. However, these may be classified as Level 3 investments due to lack of market transparency and corroboration to support these quoted prices. Additionally, valuation models may be used as the pricing source for any remaining investments classified as Level 3. These models rely on one or more significant unobservable inputs and/or significant assumptions by the Fund Administrator. Inputs used in valuations may include, but are not limited to, financial statement analysis, capital account balances, discount rates and estimated cash flows, and comparable company data.

The following table is a summary of the inputs used to value the Fund’s investments as of Oct. 31, 2010:

	Fair value at Oct. 31, 2010
	Level 1		Level 2
	quoted prices		other		Level 3
	in active		significant		significant
	markets for		observable		unobservable
Description	identical assets(a)		inputs		inputs		Total
Investments in Affiliated Funds	$	231,691,367	$	—	$	—	$	231,691,367

(a) There were no significant transfers between Levels 1 and 2 during the period.

Investments in Affiliated Funds
Columbia Income Builder Fund II
Oct. 31, 2010 (Unaudited)

(Percentages represent value of investments compared to net assets)

Equity Funds (24.8%)

	Shares			Value(a)
Dividend Income (9.4%)
Columbia Dividend Opportunity Fund		4,772,534		$	35,650,828
International (2.8%)
RiverSource Disciplined International Equity Fund		1,401,982			10,374,667
Real Estate (4.8%)
RiverSource Real Estate Fund		1,666,290	(c)		17,962,601
U.S. Large Cap (3.3%)
Columbia Large Core Quantitative Fund		201,996			1,042,301
Columbia Large Value Quantitative Fund		1,341,096			11,426,133
Total					12,468,434
U.S. Small Cap (4.5%)
RiverSource Disciplined Small Cap Value Fund		1,994,387	(c)		16,772,796
Total Equity Funds (Cost: $88,466,723)				$	93,229,326

Fixed Income Funds (71.8%)

	Shares			Value(a)
Emerging Markets (8.3%)
Columbia Emerging Markets Bond Fund		2,676,430	(c)	$	31,287,469
Floating Rate (9.6%)
Columbia Floating Rate Fund		4,086,273	(c)		35,918,342
Global Bond (3.0%)
Columbia Global Bond Fund		1,504,488			11,253,567
High Yield (17.6%)
Columbia High Yield Bond Fund		19,549,341			54,542,661
Columbia Income Opportunities Fund		1,134,314			11,445,231
Total					65,987,892
Inflation Protected Securities (4.8%)
Columbia Inflation Protected Securities Fund		1,683,300			18,230,144
Investment Grade (28.5%)
Columbia Diversified Bond Fund		11,198,799			57,113,877
Columbia Limited Duration Credit Fund		372,771			3,761,256
Columbia U.S. Government Mortgage Fund		8,691,784	(c)		46,153,375
Total					107,028,508
Total Fixed Income Funds (Cost: $244,427,604)				$	269,705,922

Alternative Investments (3.3%)

	Shares			Value(a)
Columbia Absolute Return Currency and Income Fund		1,247,115	(b,c)	$	12,583,391
Total Alternative Investments (Cost: $12,887,088)				$	12,583,391

Cash Equivalents (—%)

	Shares		Value(a)
Money Market
Columbia Money Market Fund		141,295	$	141,295
Total Cash Equivalents (Cost: $141,295)			$	141,295
Total Investments in Affiliated Funds (Cost: $345,922,710)(d)			$	375,659,934

Notes to Investments in Affiliated Funds

(a)	Securities are valued by using policies described in Note 2 to the financial statements in the most recent Semiannual Report dated July 31, 2010.
(b)	Non-income producing.
(c)	The fund does not invest in underlying funds for the purpose of exercising management or control. At Oct. 31, 2010, the fund held the following positions, which exceed 5% of the underlying fund’s shares outstanding:

Underlying fund	Percent of shares held
RiverSource Disciplined Small Cap Value Fund		42.77	%
Columbia U.S. Government Mortgage Fund		18.60
Columbia Emerging Markets Bond Fund		13.27
Columbia Floating Rate Fund		9.59
RiverSource Real Estate Fund		8.75
Columbia Absolute Return Currency and Income Fund		7.34

(d) At Oct. 31, 2010, the cost of securities for federal income tax purposes was approximately $345,923,000 and the approximate aggregate gross unrealized appreciation and depreciation based on that cost was:

Unrealized appreciation	$	37,372,000
Unrealized depreciation		(7,635,000	)
Net unrealized appreciation	$	29,737,000

Fair Value Measurements

Generally accepted accounting principles (GAAP) require disclosure regarding the inputs and valuation techniques used to measure fair value and any changes in valuation inputs or techniques. In addition, investments shall be disclosed by major category.

The Fund categorizes its fair value measurements according to a three-level hierarchy that maximizes the use of observable inputs and minimizes the use of unobservable inputs by prioritizing that the most observable input be used when available. Observable inputs are those that market participants would use in pricing an investment based on market data obtained from sources independent of the reporting entity. Unobservable inputs are those that reflect the Fund’s assumptions about the information market participants would use in pricing an investment. An investment’s level within the fair value hierarchy is based on the lowest level of any input that is deemed significant to the asset or liability’s fair value measurement. The input levels are not necessarily an indication of the risk or liquidity associated with investments at that level. For example, certain U.S. government securities are generally high quality and liquid, however, they are reflected as Level 2 because the inputs used to determine fair value may not always be quoted prices in an active market.

Fair value inputs are summarized in the three broad levels listed below:

• Level 1 — Valuations based on quoted prices for investments in active markets that the Fund has the ability to access at the measurement date (to include NAV for open-end mutual funds). Valuation adjustments are not applied to Level 1 investments.

• Level 2 — Valuations based on other significant observable inputs (including quoted prices for similar securities, interest rates, prepayment speeds, credit risks, etc.).

• Level 3 — Valuations based on significant unobservable inputs (including the Fund’s own assumptions and judgment in determining the fair value of investments).

Inputs that are used in determining fair value of an investment may include price information, credit data, volatility statistics, and other factors. These inputs can be either observable or unobservable. The availability of observable inputs can vary between investments, and is affected by various factors such as the type of investment, and the volume and level of activity for that investment or similar investments in the marketplace. The inputs will be considered by the Fund Administrator, along with any other relevant factors in the calculation of an investment’s fair value. The Fund uses prices and inputs that are current as of the measurement date, which may include periods of market dislocations. During these periods, the availability of prices and inputs may be reduced for many investments. This condition could cause an investment to be reclassified between the various levels within the hierarchy.

Investments falling into the Level 3 category are primarily supported by quoted prices from brokers and dealers participating in the market for those investments. However, these may be classified as Level 3 investments due to lack of market transparency and corroboration to support these quoted prices. Additionally, valuation models may be used as the pricing source for any remaining investments classified as Level 3. These models rely on one or more significant unobservable inputs and/or significant assumptions by the Fund Administrator. Inputs used in valuations may include, but are not limited to, financial statement analysis, capital account balances, discount rates and estimated cash flows, and comparable company data.

The following table is a summary of the inputs used to value the Fund’s investments as of Oct. 31, 2010:

	Fair value at Oct. 31, 2010
	Level 1		Level 2
	quoted prices		other		Level 3
	in active		significant		significant
	markets for		observable		unobservable
Description	identical assets(a)		inputs		inputs		Total
Investments in Affiliated Funds	$	375,659,934	$	—	$	—	$	375,659,934

(a) There were no significant transfers between Levels 1 and 2 during the period.

Investments in Affiliated Funds
Columbia Income Builder Fund III
Oct. 31, 2010 (Unaudited)

(Percentages represent value of investments compared to net assets)

Equity Funds (24.7%)

	Shares			Value(a)
Dividend Income (8.2%)
Columbia Dividend Opportunity Fund		2,112,273		$	15,778,681
International (4.3%)
RiverSource Disciplined International Equity Fund		1,097,750			8,123,350
Real Estate (6.8%)
RiverSource Real Estate Fund		1,206,565	(c)		13,006,769
U.S. Large Cap (0.9%)
Columbia Large Core Quantitative Fund		40,711			210,068
Columbia Large Value Quantitative Fund		180,268			1,535,887
Total					1,745,955
U.S. Small Cap (4.5%)
RiverSource Disciplined Small Cap Value Fund		1,010,862	(c)		8,501,349
Total Equity Funds (Cost: $42,144,228)				$	47,156,104

Fixed Income Funds (73.3%)

	Shares			Value(a)
Emerging Markets (10.3%)
Columbia Emerging Markets Bond Fund		1,678,016	(c)	$	19,616,008
Floating Rate (11.8%)
Columbia Floating Rate Fund		2,566,553	(c)		22,559,998
Global Bond (4.0%)
Columbia Global Bond Fund		1,014,444			7,588,044
High Yield (23.3%)
Columbia High Yield Bond Fund		12,673,648			35,359,477
Columbia Income Opportunities Fund		897,861			9,059,416
Total					44,418,893
Inflation Protected Securities (2.3%)
Columbia Inflation Protected Securities Fund		410,747			4,448,391
Investment Grade (21.6%)
Columbia Diversified Bond Fund		4,485,503			22,876,065
Columbia Limited Duration Credit Fund		143,399			1,446,898
Columbia U.S. Government Mortgage Fund		3,184,537	(c)		16,909,892
Total					41,232,855
Total Fixed Income Funds (Cost: $126,906,626)				$	139,864,189

Alternative Investments (1.9%)

	Shares			Value(a)
Columbia Absolute Return Currency and Income Fund		352,308	(b)	$	3,554,784
Total Alternative Investments (Cost: $3,576,972)				$	3,554,784

Cash Equivalents (0.1%)

	Shares		Value(a)
Money Market
Columbia Money Market Fund		152,512	$	152,512
Total Cash Equivalents (Cost: $152,512)			$	152,512
Total Investments in Affiliated Funds (Cost: $172,780,338)(d)			$	190,727,589

Notes to Investments in Affiliated Funds

(a)	Securities are valued by using policies described in Note 2 to the financial statements in the most recent Semiannual Report dated July 31, 2010.
(b)	Non-income producing.
(c)	The fund does not invest in underlying funds for the purpose of exercising management or control. At Oct. 31, 2010, the fund held the following positions, which exceed 5% of the underlying fund’s shares outstanding:

Underlying fund	Percent of shares held
RiverSource Disciplined Small Cap Value Fund		21.78	%
Columbia Emerging Markets Bond Fund		8.31
Columbia U.S. Government Mortgage Fund		6.81
RiverSource Real Estate Fund		6.18
Columbia Floating Rate Fund		6.02

(d) At Oct. 31, 2010, the cost of securities for federal income tax purposes was approximately $172,780,000 and the approximate aggregate gross unrealized appreciation and depreciation based on that cost was:

Unrealized appreciation	$	20,862,000
Unrealized depreciation		(2,914,000	)
Net unrealized appreciation	$	17,948,000

Fair Value Measurements

Generally accepted accounting principles (GAAP) require disclosure regarding the inputs and valuation techniques used to measure fair value and any changes in valuation inputs or techniques. In addition, investments shall be disclosed by major category.

The Fund categorizes its fair value measurements according to a three-level hierarchy that maximizes the use of observable inputs and minimizes the use of unobservable inputs by prioritizing that the most observable input be used when available. Observable inputs are those that market participants would use in pricing an investment based on market data obtained from sources independent of the reporting entity. Unobservable inputs are those that reflect the Fund’s assumptions about the information market participants would use in pricing an investment. An investment’s level within the fair value hierarchy is based on the lowest level of any input that is deemed significant to the asset or liability’s fair value measurement. The input levels are not necessarily an indication of the risk or liquidity associated with investments at that level. For example, certain U.S. government securities are generally high quality and liquid, however, they are reflected as Level 2 because the inputs used to determine fair value may not always be quoted prices in an active market.

Fair value inputs are summarized in the three broad levels listed below:

• Level 1 — Valuations based on quoted prices for investments in active markets that the Fund has the ability to access at the measurement date (to include NAV for open-end mutual funds). Valuation adjustments are not applied to Level 1 investments.

• Level 2 — Valuations based on other significant observable inputs (including quoted prices for similar securities, interest rates, prepayment speeds, credit risks, etc.).

• Level 3 — Valuations based on significant unobservable inputs (including the Fund’s own assumptions and judgment in determining the fair value of investments).

Inputs that are used in determining fair value of an investment may include price information, credit data, volatility statistics, and other factors. These inputs can be either observable or unobservable. The availability of observable inputs can vary between investments, and is affected by various factors such as the type of investment, and the volume and level of activity for that investment or similar investments in the marketplace. The inputs will be considered by the Fund Administrator, along with any other relevant factors in the calculation of an investment’s fair value. The Fund uses prices and inputs that are current as of the measurement date, which may include periods of market dislocations. During these periods, the availability of prices and inputs may be reduced for many investments. This condition could cause an investment to be reclassified between the various levels within the hierarchy.

Investments falling into the Level 3 category are primarily supported by quoted prices from brokers and dealers participating in the market for those investments. However, these may be classified as Level 3 investments due to lack of market transparency and corroboration to support these quoted prices. Additionally, valuation models may be used as the pricing source for any remaining investments classified as Level 3. These models rely on one or more significant unobservable inputs and/or significant assumptions by the Fund Administrator. Inputs used in valuations may include, but are not limited to, financial statement analysis, capital account balances, discount rates and estimated cash flows, and comparable company data.

The following table is a summary of the inputs used to value the Fund’s investments as of Oct. 31, 2010:

	Fair value at Oct. 31, 2010
	Level 1		Level 2
	quoted prices		other		Level 3
	in active		significant		significant
	markets for		observable		unobservable
Description	identical assets(a)		inputs		inputs		Total
Investments in Affiliated Funds	$	190,727,589	$	—	$	—	$	190,727,589

(a) There were no significant transfers between Levels 1 and 2 during the period.

Item 2. Control and Procedures.

(a) The registrant’s principal executive officer and principal financial officer, based on their evaluation of the registrant’s disclosure controls and procedures as of a date within 90 days of the filing of this report, have concluded that such controls and procedures are adequately designed to ensure that material information required to be disclosed by the registrant in Form N-Q is accumulated and communicated to the registrant’s management, including the principal executive officer and principal financial officer, or persons performing similar functions, as appropriate to allow timely decisions regarding required disclosure.

(b) There was no change in the registrant’s internal control over financial reporting that occurred during the registrant’s last fiscal quarter that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting.

Item 3. Exhibits.

Certifications pursuant to Rule 30a-2(a) under the Investment Company Act of 1940 (17 CFR 270.30a-2(a)) attached hereto as Exhibit 99.CERT.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934 and the Investment Company Act of 1940, the Registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

(Registrant)                               RiverSource Income Series, Inc.

By	/s/ J. Kevin Connaughton J. Kevin Connaughton
	President and Principal Executive Officer

Date December 20, 2010

Pursuant to the requirements of the Securities Exchange Act of 1934 and the Investment Company Act of 1940, this report has been signed below by the following persons on behalf of the Registrant and in the capacities and on the dates indicated.

By	/s/ J. Kevin Connaughton J. Kevin Connaughton
	President and Principal Executive Officer

Date December 20, 2010

By	/s/ Jeffrey P. Fox Jeffrey P. Fox
	Treasurer and Principal Financial Officer

Date December 20, 2010