SC 13G/A

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UNITED STATES
SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 13G

(Rule 13d-102)

Under the Securities Exchange Act of 1934
(Amendment No. 4)*

INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT TO
RULES 13d-1(b), (c) AND (d) AND AMENDMENTS THERETO FILED
PURSUANT TO RULE 13d-2(b)

WASHINGTON GROUP INTERNATIONAL, INC

(Name of Issuer)

Shares of Common Stock, $0.01 Per Share

(Title of Class of Securities)

938862208

(CUSIP Number)

December 31, 2006

(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

     o Rule 13d-1(b)

     þ Rule 13d-1(c)

     o Rule 13d-1(d)

* The remainder of this cover page shall be filled out for a reporting person’s initial filing on this form with respect to the subject class of securities, and for any subsequent amendment containing information which would alter the disclosures provided in a prior cover page.

The information required in the remainder of this cover page shall not be deemed to be “filed” for the purpose of Section 18 of the Securities Exchange Act of 1934 (“Act”) or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).

CUSIP No. 938862208 

1	NAMES OF REPORTING PERSONS: Greenlight Capital, L.L.C.
	I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY):
	13-3886851
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS):
	(a)   o
	(b)   o
3	SEC USE ONLY:
4	CITIZENSHIP OR PLACE OF ORGANIZATION:
	Delaware
		5	SOLE VOTING POWER:
NUMBER OF			1,305,012
SHARES		6	SHARED VOTING POWER:
BENEFICIALLY
OWNED BY			0
EACH		7	SOLE DISPOSITIVE POWER:
REPORTING
PERSON			1,305,012
WITH:		8	SHARED DISPOSITIVE POWER:
			0
9	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON:
	1,305,012
10	CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS):
	o
11	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9):
	4.4%**
12	TYPE OF REPORTING PERSON (SEE INSTRUCTIONS):
	OO

*SEE INSTRUCTIONS BEFORE FILLING OUT

**SEE ITEM 4(b).

2

CUSIP No. 938862208 

1	NAMES OF REPORTING PERSONS: Greenlight Capital, Inc.
	I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY):
	13-3871632
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS):
	(a)   o
	(b)   o
3	SEC USE ONLY:
4	CITIZENSHIP OR PLACE OF ORGANIZATION:
	Delaware
		5	SOLE VOTING POWER:
NUMBER OF			1,357,500
SHARES		6	SHARED VOTING POWER:
BENEFICIALLY
OWNED BY			0
EACH		7	SOLE DISPOSITIVE POWER:
REPORTING
PERSON			1,357,500
WITH:		8	SHARED DISPOSITIVE POWER:
			0
9	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON:
	1,357,500
10	CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS):
	o
11	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9):
	4.5%
12	TYPE OF REPORTING PERSON (SEE INSTRUCTIONS):
	CO

*SEE INSTRUCTIONS BEFORE FILLING OUT

**SEE ITEM 4(b).

3

CUSIP No. 938862208 

1	NAMES OF REPORTING PERSONS: DME Advisors, L.P.
	I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY):
	20-1365209
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS):
	(a)   o
	(b)   o
3	SEC USE ONLY:
4	CITIZENSHIP OR PLACE OF ORGANIZATION:
	Delaware
		5	SOLE VOTING POWER:
NUMBER OF			192,988
SHARES		6	SHARED VOTING POWER:
BENEFICIALLY
OWNED BY			0
EACH		7	SOLE DISPOSITIVE POWER:
REPORTING
PERSON			192,988
WITH:		8	SHARED DISPOSITIVE POWER:
			0
9	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON:
	192,988
10	CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS):
	o
11	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9):
	0.6%**
12	TYPE OF REPORTING PERSON (SEE INSTRUCTIONS):
	PN

*SEE INSTRUCTIONS BEFORE FILLING OUT

**SEE ITEM 4(b).

4

CUSIP No. 938862208 

1	NAMES OF REPORTING PERSONS: David Einhorn
	I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY):
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS):
	(a)   o
	(b)   o
3	SEC USE ONLY:
4	CITIZENSHIP OR PLACE OF ORGANIZATION:
	U.S. Citizen
		5	SOLE VOTING POWER:
NUMBER OF			2,855,500
SHARES		6	SHARED VOTING POWER:
BENEFICIALLY
OWNED BY			0
EACH		7	SOLE DISPOSITIVE POWER:
REPORTING
PERSON			2,855,500
WITH:		8	SHARED DISPOSITIVE POWER:
			0
9	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON:
	2,855,500
10	CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS):
	o
11	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9):
	9.6%**
12	TYPE OF REPORTING PERSON (SEE INSTRUCTIONS):
	IN

*SEE INSTRUCTIONS BEFORE FILLING OUT

**SEE ITEM 4(b).

5

TABLE OF CONTENTS

	Item 4 Ownership
SIGNATURE
Joint Filing Agreement

AMENDMENT NO. 4 TO SCHEDULE 13G

     This Amendment No. 4 (this “Amendment”) to the Schedule 13G (the “Schedule 13G”), as filed with the Securities and Exchange Commission (the “SEC”) on July 29, 2004 as amended by Amendment No. 1, filed with the SEC on August 3, 2004, as amended by Amendment No. 2, filed with the SEC on February 14, 2005, as amended by Amendment No. 3, filed with the SEC on February 14, 2006, is being filed on behalf of Greenlight Capital, L.L.C., a Delaware limited liability company (“Greenlight LLC”), Greenlight Capital, Inc., a Delaware corporation (“Greenlight Inc”), DME Advisors, L.P., a Delaware limited partnership (“Advisors,” and together with Greenlight LLC and Greenlight Inc, “Greenlight”), DME Advisors GP, LLC, a Delaware limited liability company that serves as general partner to Advisors, and Mr. David Einhorn, principal of Greenlight (collectively with Greenlight, the “Reporting Persons”).

     This Amendment to Schedule 13G relates to the Common Stock, par value $0.01 per share (the “Common Shares”), of Washington Group International, Inc., a Delaware corporation, purchased by Greenlight for the account of (i) Greenlight Capital, L.P. (“Greenlight Fund”), of which Greenlight LLC is the general partner, (ii) Greenlight Capital Qualified, L.P. (“Greenlight Qualified”), of which Greenlight LLC is the general partner, (iii) Greenlight Capital Offshore, Ltd. (“Greenlight Offshore”), to which Greenlight Inc acts as investment advisor, and (iv) any managed accounts for which Advisors acts as investment manager.

     This Amendment is being filed to amend and restate Item 4 as follows:

Item 4 Ownership.

(a)	As of December 31, 2006, Greenlight and Mr. Einhorn are the beneficial owners of 2,855,500 Common Shares.
(b)	Greenlight and Mr. Einhorn are the beneficial owners of 9.6% of the outstanding Common Shares. This percentage is determined by dividing 2,855,500 by 29,848,138, the number of Common Shares issued and outstanding as of October 30, 2006, as reported in the Form 10-Q filed on November 11, 2006 with the Securities and Exchange Commission.
(c)	Greenlight has the sole power to vote and dispose of the 2,855,500 Common Shares beneficially owned by it. As the principal of Greenlight, Mr. Einhorn may direct the vote and disposition of the 2,855,500 Common Shares beneficially owned by Greenlight.

The filing of this Schedule 13G shall not be construed as an admission that any of the Reporting Persons is for the purposes of Section 13(d) or 13(g) of the Securities Exchange Act of 1934, as amended, the beneficial owner of any of the 2,855,500 Common Shares owned by Greenlight Fund, Greenlight Qualified, Greenlight Offshore or any managed account managed by Advisors. Pursuant to Rule 13d-4, each of the Reporting Persons disclaims all such beneficial ownership.

Exhibits Exhibit 99.1

     Joint Filing Agreement between Greenlight and David Einhorn.

6

SIGNATURE

     After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

     Date: February 14, 2007

Greenlight Capital, L.L.C.
By:	/S/ DANIEL ROITMAN
	Daniel Roitman, Chief Operating Officer
Greenlight Capital, Inc.
By:	/S/ DANIEL ROITMAN
	Daniel Roitman, Chief Operating Officer
DME Advisors, L.P.
By:	DME Advisors GP, L.L.C., its general partner
	By:	/S/ DANIEL ROITMAN
		Daniel Roitman, Chief Operating Officer
/S/ DANIEL ROITMAN
Daniel Roitman, on behalf of David Einhorn

     The Power of Attorney, executed by David Einhorn authorizing Harry Brandler and Daniel Roitman to sign and file this Amendment on David Einhorn’s behalf, which was filed with the Schedule 13G filed with the Securities and Exchange Commission on July 18, 2005, by the Reporting Persons with respect to the Ordinary Shares of Flamel Technologies S.A. is hereby incorporated by reference.

7

EX-99.1

EXHIBIT 99.1

JOINT FILING AGREEMENT

     In accordance with Rule 13d-1(k) under the Securities Exchange Act of 1934, as amended, the undersigned agree to the joint filing on behalf of each of them of a Statement on Schedule 13G (including any and all amendments thereto) with respect to the Shares of Common Stock, par value $0.01 per share, of Washington Group International, Inc., and further agree that this Joint Filing Agreement shall be included as an Exhibit to such joint filings.

     The undersigned further agree that each party hereto is responsible for the timely filing of such Statement on Schedule 13G and any amendments thereto, and for the accuracy and completeness of the information concerning such party contained therein; provided, however, that no party is responsible for the accuracy or completeness of the information concerning any other party, unless such party knows or has reason to believe that such information is inaccurate.

     This Joint Filing Agreement may be signed in counterparts with the same effect as if the signature on each counterpart were upon the same instrument.

     IN WITNESS WHEREOF, the undersigned have executed this Agreement as of February 14, 2007.

Greenlight Capital, L.L.C.
By:	/S/ DANIEL ROITMAN
	Daniel Roitman, Chief Operating Officer
Greenlight Capital, Inc.
By:	/S/ DANIEL ROITMAN
	Daniel Roitman, Chief Operating Officer
DME Advisors, L.P.
By:	DME Advisors GP, L.L.C., its general partner
	By:	/S/ DANIEL ROITMAN
		Daniel Roitman, Chief Operating Officer
/S/ DANIEL ROITMAN
Daniel Roitman, on behalf of David Einhorn