UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
Notice of Effectiveness
Effectiveness Date:	August 4, 2011 5:00 P.M.

Form:	S-4
CIK: 0001372020 Company Name: Great Lakes Dredge & Dock CORP File Number: 333-175699
CIK: 0001526363 Company Name: Great Lakes Dredge & Dock Company, LLC File Number: 333-175699-06
CIK: 0001526375 Company Name: NASDI Holdings Corp File Number: 333-175699-05
CIK: 0001526373 Company Name: NASDI, LLC File Number: 333-175699-04
CIK: 0001070599 Company Name: FIFTY THREE DREDGING CORP File Number: 333-175699-03
CIK: 0001140031 Company Name: GREAT LAKES CARIBBEAN DREDGING INC File Number: 333-175699-02
CIK: 0001070597 Company Name: DAWSON MARINE SERVICES CO File Number: 333-175699-01