EXHIBIT 21.01 Subsidiaries of the Registrant ------------------------------ Jurisdiction Name of Incorporation Organization Ownership ---- ----------------------------- --------- Great Lakes Dredge & Dock Company New Jersey 100% Great Lakes International, Ind. Delaware 100% Dawson Dredging Company Delaware 100% Gates Construction Corp. New Jersey 100% Fifty-Three Dredging Corporation New Jersey 100% Amboy Aggregates (A JOINT VENTURE) New Jersey 50% NATCO Limited Partnership Delaware 75% North American Trailing Company Delaware 80%