Great Lakes to Announce Third Quarter Results

Great Lakes Dredge & Dock Corporation (NASDAQ: GLDD) will release its financial results for the quarter and nine months ended September 30 2009 on Tuesday November 3 2009 at 7:00 a.m. C.S.T. A conference call will be held the same day at 10:00 a.m. C.S.T. The call in number is 866-202-1971 and pass code is 40845286. The call can also be heard on the company’s Web site www.gldd.com under Events and Presentations on the investor relations page. Information related to the conference call will also be available on the investor relations page of the site. The conference call will be available by replay for two weeks by calling 888-286-8010 and providing pass code 79108006.

Great Lakes Dredge & Dock Corporation is the largest provider of dredging services in the United States and has significant international operations averaging 30 percent of the company’s dredging revenue over the past three years.