UNITED STATES
SECURITIES AND EXCHANGE COMMISSION

Washington, D.C.  20549

FORM 8-K
CURRENT REPORT

Pursuant to Section 13 or 15(d) of
The Securities Exchange Act of 1934

Date of Report –March 25, 2006

(Date of earliest event reported)

QUESTAR CORPORATION
(Exact name of registrant as specified in charter)

STATE OF UTAH                                        1-8796                                87-0407509

(State of other jurisdiction of            (Commission File No.)             (I.R.S. Employer

incorporation or organization)                                                          Identification No.)

180 East 100 South Street, P.O. Box 45433 Salt Lake City, Utah 84145-0433
(Address of principal executive offices)

Registrant's telephone number, including area code (801) 324-5000

                                  Not Applicable                                  
(Former name or former address, if changed since last report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):

[  ]  Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

[  ]  Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

[  ]  Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17

       CFR 240.14d-2(b))

[  ]  Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17

       CFR 240.13e-4(c))

Item 3.03 - Material Modification to Rights of Security Holders

On March 25, 2006, Questar Corporation’s Shareholder Rights Plan (Plan) expired by its own terms.

On February 13, 1996, Questar's Board of Directors adopted the Plan declaring a stock-right dividend for each outstanding share of common stock. The stock rights were issued March 25, 1996. The rights would have become exercisable if a person had acquired 15% or more of the Company's common stock or had announced an offer for 15% or more of the common stock. With the expiration of the Plan, no such stock rights exist.

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.

		QUESTAR CORPORATION   (Registrant)
March 28, 2006		/s/ Keith O. Rattie
		Chairman, President and Chief Executive Officer