UNITED STATES
SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D. C. 20549

FORM 10-Q/A

þ Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

For the quarterly period ended June 30, 2008

or

o 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 1-7414

NORTHWEST PIPELINE GP

(Exact name of registrant as specified in its charter)

DELAWARE (State or other jurisdiction of incorporation or organization)	26-1157701 (I.R.S. Employer Identification No.)
295 Chipeta Way, Salt Lake City, Utah (Address of principal executive offices)	84108 (Zip Code)

(801) 583-8800
(Registrant’s telephone number, including area code)

No Change
(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 þ     No o

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 the definitions of “large accelerated filer,” “accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act. (Check one):

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

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

EXPLANATORY NOTE

     The Registrant is filing this Amendment No. 1 (the “Amendment”) to the Registrant’s Quarterly Report on Form 10-Q for the quarterly period ended June 30, 2008 (the “Form 10-Q”), which was originally filed with the Securities and Exchange Commission on August 7, 2008. The Amendment is being filed solely to correct the Section 302 certifications filed as Exhibits 31.1 and 31.2 to the Form 10-Q, which inadvertently omitted certain language that was required to be included.

     Except for the matter described above, the Amendment does not change any previously reported financial results, modify or update disclosures in the Form 10-Q, or reflect events occurring after the date of the filing of the Form 10-Q.

PART II
OTHER INFORMATION

Item 6. Exhibits.

     The exhibits that are filed with this Amendment are set forth in the Exhibit Index.

SIGNATURES

     Pursuant to the requirements of Section 13 or 15(d) 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.

NORTHWEST PIPELINE CORPORATION (Registrant)
By	/s/ R. Rand Clark
	R. Rand Clark
	Controller

     Date: August 25, 2008

EXHIBIT INDEX

Exhibit	Description
31.1	Section 302 Certification of Principal Executive Officer
31.2	Section 302 Certification of Principal Financial Officer
32.1	Section 906 Certification of Principal Executive Officer and Principal Financial Officer