UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549  FORM 10-Q/A Amendment No. 1  [X] QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934. For the quarterly period ended June 30, 2011  [   ] TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934. For the transition period from ___ to ___  Exact name of registrant as specified in its charterState or other jurisdiction or incorporation of organizationCommission File Number(I.R.S. Employer
Identification No.)Questar CorporationUtah001-0879687-0407509Questar Pipeline CompanyUtah000-1414787-0307414Questar Gas CompanyUtah333-6921087-0155877  180 East 100 South Street, P.O. Box 45433 Salt Lake City, Utah 84145-0433 (Address of principal executive offices)  Registrants telephone number, including area code (801) 324-5000 Web sitehttp://www.questar.com  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.  Questar CorporationYes [X]   No [   ]Questar Pipeline CompanyYes [X]   No [   ]Questar Gas CompanyYes [X]   No [   ]  Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (Section 232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).  Questar CorporationYes [X]   No [   ]Questar Pipeline CompanyYes [   ]   No [   ]Questar Gas CompanyYes [   ]   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. Do not check non-accelerated filer if a smaller reporting company (Check one):  Questar CorporationLarge accelerated filer [X]Accelerated filer [   ]Non-accelerated filer [   ]Smaller reporting company [   ]Questar Pipeline CompanyLarge accelerated filer [   ]Accelerated filer [   ]Non-accelerated filer [X]Smaller reporting company [   ]Questar Gas CompanyLarge accelerated filer [   ]Accelerated filer [   ]Non-accelerated filer [X]Smaller reporting company [   ]  Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).  Questar CorporationYes [   ]   No [X]Questar Pipeline CompanyYes [   ]   No [X]Questar Gas CompanyYes [   ]   No [X]   Indicate the number of shares outstanding of each of the issuers classes of common stock, as of July 31, 2011:  Questar Corporationwithout par value177,507,911Questar Pipeline Company$1.00 per share par value6,550,843Questar Gas Company$2.50 per share par value9,189,626  Questar Pipeline Company and Questar Gas Company, as wholly-owned subsidiaries of a reporting company, meet the conditions set forth in General Instruction H(1)(a) and (b) of Form 10-Q and are therefore filing this form with the reduced disclosure format.


QUESTAR CORPORATION QUESTAR PIPELINE COMPANY QUESTAR GAS COMPANY FORM 10-Q/A Amendment No.1 FOR THE QUARTERLY PERIOD ENDED JUNE 30, 2011  EXPLANATORY NOTE This amendment No. 1 for the Quarterly Report on Form 10-Q/A is being filed to clarify that the disclosure in the ITEM 4. CONTROLS AND PROCEDURES applies to all three registrants, Questar Corporation, Questar Pipeline Company and Questar Gas Company.   ITEM 4.  CONTROLS AND PROCEDURES.  Evaluation of Disclosure Controls and Procedures. The Chief Executive Officers and Chief Financial Officer of Questar Corporation, Questar Pipeline Company and Questar Gas Company have evaluated the effectiveness of Questar Corporations, Questar Pipeline Companys and Questar Gas Companys disclosure controls and procedures (as such term is defined in Rule 13a-15(e) under the Securities Exchange Act of 1934, as amended) as of June 30, 2011. Based on such evaluation, such officers have concluded that, as of June 30, 2011, Questar Corporations, Questar Pipeline Companys and Questar Gas Companys disclosure controls and procedures are effective in alerting them on a timely basis to material information relating to Questar Corporation, Questar Pipeline Company and Questar Gas Company, including their consolidated subsidiaries, required to be included in Questar Corporations, Questar Pipeline Companys and Questar Gas Companys reports filed or submitted under the Exchange Act. Questar Corporations, Questar Pipeline Companys and Questar Gas Companys Chief Executive Officers and Chief Financial Officer also concluded that the controls and procedures were effective in ensuring that information required to be disclosed by Questar Corporation, Questar Pipeline Company and Questar Gas Company in the reports that it files or submits under the Exchange Act is accumulated and communicated to Questar Corporations, Questar Pipeline Companys and Questar Gas Companys management including its principal executive and financial officers or persons performing similar functions as appropriate to allow timely decisions regarding required disclosure.  Changes in Internal Controls. There were no changes in Questar Corporations, Questar Pipeline Companys and Questar Gas Companys internal controls over financial reporting that occurred during the quarter ended June 30, 2011, that have materially affected, or are reasonably likely to materially affect, Questar Corporations,  Questar Pipeline Companys and Questar Gas Companys internal control over financial reporting.     SIGNATURES  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.  QUESTAR CORPORATION QUESTAR PIPELINE COMPANY QUESTAR GAS COMPANY (Registrants)   September 2, 2011 /s/Ronald W. Jibson Ronald W. Jibson President and Chief Executive Officer, Questar and Questar Gas  September 2, 2011 /s/R. Allan Bradley R. Allan Bradley President and Chief Executive Officer, Questar Pipeline  September 2, 2011 /s/Kevin W. Hadlock Kevin W. Hadlock Executive Vice President and Chief Financial Officer, Questar, Questar Pipeline and Questar Gas    Questar 2011 Form 10-Q 2