**UNITED
        STATES**
 **SECURITIES
        AND EXCHANGE COMMISSION**
 Washington,
        D.C. 20549
 
 **FORM
        10-K/A**
 **AMENDMENT
        NO. 1**
 
 
 Annual
        Report Pursuant to
 Section
        13 or 15(d) of the Securities Exchange Act of 1934
 
 **For
        the Fiscal Year Ended December 29, 2006**   **Commission
        File Number 1-12054**
 
 
 **WASHINGTON
        GROUP INTERNATIONAL, INC.**
 A
        Delaware Corporation
 IRS
        Employer Identification No. 33-0565601
 
 720
        PARK
        BOULEVARD, BOISE, IDAHO 83712
 208-386-5000
 
 
 
 **SECURITIES
        REGISTERED PURSUANT TO SECTION 12(b) and**
 **SECTION
        12(g) OF THE ACT**
 
 Securities
        registered pursuant to Section 12(b) of the Exchange Act: None
 
 Securities
        registered pursuant to Section 12(g) of the Exchange Act:
 
 **Title
        of class**
 Common
        Stock, $.01 par value per share
 
 **COMPLIANCE
        WITH REPORTING REQUIREMENTS**
 
 Indicate
        by check mark if the registrant is a well-known seasoned issuer, as defined
        in
        Rule 405 of the Securities Act.
 X Yes    No
 
 Indicate
        by check mark if the registrant is not required to file reports pursuant
        to
        Section 13 or Section 15(d) of the Act.
 Yes  X  No
 
 Indicate
        by check mark whether the registrant is a large accelerated filer, an
        accelerated filer, or a non-accelerated filer. See definition of “Accelerated
        filer and large accelerated filer,” in Rule 12b-2 of the Exchange Act of
        1934.
 X  Large
        accelerated filer   Accelerated Filer  Non-accelerated filer
 
 Indicate
        by check mark whether the registrant is a shell company (as defined in Rule
        12b-2 of the Exchange Act).
 ____Yes   X No
 
 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.  X Yes  No
 
 Indicate
        by check mark whether the registrant has filed all documents and reports
        required to be filed by Section 12, 13, or 15(d) of the Exchange Act subsequent
        to the distribution of securities under a plan confirmed by a court. X Yes  No
 
 
 **DISCLOSURE
        PURSUANT TO ITEM 405 OF REGULATION S-K**
 Indicate
        by check mark if disclosure of delinquent filers pursuant to Item 405 of
        Regulation S-K is not contained herein, and will not be contained, to the
        best
        of registrant’s knowledge, in definitive proxy or information statements
        incorporated by reference in Part III of this Form 10-K or any amendment
        to this
        Form 10-K. X
 
 
 **AGGREGATE
        MARKET VALUE OF COMMON STOCK HELD BY NON-AFFILIATES**
 At
        June
        30, 2006 (the last business day of the registrant’s most recently completed
        second fiscal quarter), the aggregate market value of the registrant’s common
        stock held by nonaffiliates of the registrant, based on the closing price
        on
        June 30, 2006, as reported by the NASDAQ Global Select Market®, was
        approximately $1,527,217,172.
 
 The
        number of shares of common stock outstanding as of February 21, 2007  was
        28,856,499.
 
 
 **DOCUMENTS
        INCORPORATED BY REFERENCE**
 Portions
        of the registrant’s definitive proxy statement for its annual meeting of
        stockholders to be held on May 18, 2007, which is expected to be filed with
        the
        Securities and Exchange Commission not later than April 17, 2007, are
        incorporated by reference into Part III of this report on Form 10-K. In the
        event such proxy statement is not filed by April 17, 2006, the required
        information will be filed as an amendment to this report on Form 10-K no
        later
        than that date.
 
  
   **EXPLANATORY
        NOTE**
 Washington
        Group International, Inc. hereby amends the Signatures page of its Annual
        Report
        on Form 10-K for the fiscal year ended December 29, 2006 (the “Original 2006
        Form 10-K”) solely to change the dates listed on that page as “February XX,
        2007” to “February 26, 2007.”
 The
        Original 2006 Form 10-K, including the signature page, is not reproduced
        in this
        Amendment.
 
 
  
   **SIGNATURES**
 
 Pursuant
        to the requirements of Section 13 or 15(d) of the Securities Exchange Act
        of
        1934, we have duly caused this Amendment No. 1 to the Original 2006 Form
        10-K to
        be signed on our behalf by the undersigned, thereunto duly authorized on
        February 27, 2007.
 
 Washington
        Group International, Inc.
 
 By  /s/
        George H. Juetten
 George
        H.
        Juetten, Executive Vice President and Chief Financial Officer
 
 Pursuant
        to the requirements of the Securities Exchange Act of 1934, this Amendment
        No. 1
        to the Original 2006 Form 10-K has been signed below on February 27, 2007
        by the
        following persons on our behalf in the capacities indicated.
 
 
 Chief
        Executive Officer and President and Director
 /s/
        Stephen G. Hanks  (Principal
        Executive Officer)
 
 Executive
        Vice President and Chief Financial Officer
 /s/
        George H. Juetten  (Principal
        Financial Officer)
 
 Vice
        President and Controller
 /s/
        Jerry
        K. Lemon  (Principal
        Accounting Officer)
 
 
 /s/
        Dennis R. Washington*  Chairman
        and Director
 
 /s/
        David
        H. Batchelder*  Director
 
 /s/
        Michael R. D’Appolonia *  Director
 
 /s/
        C.
        Scott Greer*  Director
 
 /s/
        William H. Mallender*  Director
 
 /s/
        Michael P. Monaco*  Director
 
 /s/
        Cordell Reed*  Director
 
 /s/
        Gail
        E. Hamilton*  Director
 
 /s/
        Dennis K. Williams*  Director
 
 /s/
        John
        Alm*  Director
 
 *Craig
        G.
        Taylor, by signing his name hereto, does hereby sign this Form 10-K on behalf
        of
        each of the above-named directors of Washington Group International, Inc.,
        pursuant to powers of attorney executed on behalf of each such officer and
        director.
 
 By
        /s/
        Craig G. Taylor
 Craig
        G.
        Taylor, Attorney-in-fact