SEC Form 3

FORM 3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person* Mackie Douglas B (Last) (First) (Middle) GREAT LAKES DREDGE & DOCK CORPORATION 2122 YORK ROAD (Street) OAK BROOK IL 60523 (City) (State) (Zip)	2. Date of Event Requiring Statement (Month/Day/Year) 12/21/2006	3. Issuer Name and Ticker or Trading Symbol Great Lakes Dredge & Dock CORP [ GLDD ]
		4. Relationship of Reporting Person(s) to Issuer (Check all applicable) X Director 10% Owner X Officer (give title below) Other (specify below) President and CEO	5. If Amendment, Date of Original Filed (Month/Day/Year) 12/26/2006
			6. Individual or Joint/Group Filing (Check Applicable Line) X Form filed by One Reporting Person Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Beneficially Owned
1. Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)
Common Stock, par value $0.0001	6,000(1)	I	Common Stock held by the wife of Douglas B. Mackie

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Warrants to purchase Common Stock, par value $0.0001	12/21/2006	07/19/2007	Common Stock, par value $0.0001	6,000(2)	5	I	Warrants to purchase Common Stock held by the wife of Douglas B. Mackie

Explanation of Responses:

1. These shares were omitted from Mr. Mackie's original Form 3, and were also omitted from one Form 4 filed by Mr. Mackie on March 21, 2007.

2. These warrants to purchase common stock were incorrectly characterized as directly owned on Mr. Mackie's original Form 3.

	/s/ Douglas B. Mackie	06/27/2007
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 5 (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).
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