X0303 4 2009-09-16 0 0001372020 Great Lakes Dredge & Dock CORP GLDD 0001384113 Johnson Kyle D GREAT LAKES DREDGE & DOCK CORPORATION 2122 YORK ROAD OAK BROOK IL 60523 0 1 0 0 VP - Chief Contract Manager Common Stock 2009-09-16 4 S 0 2000 7.13 D 52501 D The sale reported was effected pursuant to a Rule 10b5-1 trading plan adopted by Mr. Johnson on October 1, 2008. /s/ Kyle D. Johnson 2009-09-17