Ownership Submission
FORM 4
Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940
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(Print or Type Responses)
1. Name and Address of Reporting Person *
Leight Nathan
   2. Issuer Name and Ticker or Trading Symbol
Great Lakes Dredge & Dock CORP [GLDD] 		5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
__X__ Director _____ 10% Owner
_____ Officer (give title below) _____ Other (specify below)
(Last)
(First)
(Middle)
GREAT LAKES DREDGE & DOCK CORPORATION, 2122 YORK ROAD		 3. Date of Earliest Transaction (Month/Day/Year)
07/03/2007
(Street)

OAKBROOK, IL 60523		 4. If Amendment, Date Original Filed(Month/Day/Year)
 6. Individual or Joint/Group Filing(Check Applicable Line)
_X_ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person
(City)
(State)
(Zip)
Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security
(Instr. 3)		 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code
(Instr. 8)		 4. Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5)		 5. Amount of Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 3 and 4)		 6. Ownership Form: Direct (D) or Indirect (I)
(Instr. 4)		 7. Nature of Indirect Beneficial Ownership
(Instr. 4)
Code V Amount (A) or (D) Price
Common Stock 07/03/2007   X(1)   14,000 A $ 5 14,000 I Common Stock Held by the wife of Mr. Leight
Common Stock               92,150 I Common Stock Held by the Leight Family Irrevocable Trust
Common Stock               52,000 I Common Stock Held by the Terrapin Partners Employee Partnership (2)
Common Stock               4,000 I Common Stock Held by various family trusts (3)
Common Stock               870,850 D  

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Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security
(Instr. 3)		 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (Month/Day/Year) 3A. Deemed Execution Date, if any (Month/Day/Year) 4. Transaction Code
(Instr. 8)		 5. Number of Derivative Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4, and 5)		 6. Date Exercisable and Expiration Date
(Month/Day/Year)		 7. Title and Amount of Underlying Securities
(Instr. 3 and 4)		 8. Price of Derivative Security
(Instr. 5)		 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 4)		 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I)
(Instr. 4)		 11. Nature of Indirect Beneficial Ownership
(Instr. 4)
Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares
Common Stock Warrants (right to buy) $ 5 07/03/2007   X     14,000 12/21/2006 07/19/2007 Common Stock 14,000 $ 0 0 I Wife of Nathan Leight
Common Stock Warrants (right to buy) $ 5             12/21/2006 07/19/2007 Common Stock 1,572,000   1,572,000 I Warrants held by Terrapin Partners LLC (4)

Reporting Owners

Reporting Owner Name / Address Relationships
 Director  10% Owner  Officer  Other
Leight Nathan
GREAT LAKES DREDGE & DOCK CORPORATION
2122 YORK ROAD
OAKBROOK, IL 60523		   X      

Signatures

 /s/ Nathan Leight   07/09/2007
**Signature of Reporting Person Date

Explanation of Responses:

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1) Mr. Leight's wife converted warrants to common stock as a result of the warrant call by Great Lakes Dredge & Dock Corporation.
(2) Terrapin Partners LLC is the general partner of such partnership, and Mr. Leight is the co-manager of Terrapin Partners LLC. Mr. Leight disclaims beneficial ownership of the securities held by Terrapin Partners LLC, except to the extent of his pecuniary interest therein.
(3) 1000 shares of common stock are owned by Bruce Leight UGMA (Mr. Leight's son is the beneficiary), 1000 shares are owned by Jennifer Leight UGMA (Mr. Leight's daughter is the beneficiary), 1000 shares are owned by Keith Leight UGMA (Mr. Leight's son is the beneficiary), and 1000 shares are owned by Lillianne Leight UGMA (Mr. Leight's daughter is the beneficiary). Mr. Leight serves as a trustee or co-trustee of those trusts.
(4) Mr. Leight is the co-managing member of Terrapin Partners LLC. Mr. Leight disclaims beneficial ownership of the securities held by Terrapin Partners LLC, except to the extent of his pecuniary interest therein.

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