 Great Lakes Dredge Dock Corporation Great Lakes or the Company GLDD, the largest provider of dredging services in the United States announced today the execution of a definitive contract for the construction of a 6,500-cubic-yard-capacity Trailing Suction Hopper Dredge. With expected delivery in the 1st quarter of 2023, the vessel will complement the companys existing six-dredge Hopper fleet, including the ATB Tug Douglas B. Mackie and 15,000-cubic-yard-capacity barge Ellis Island, which was delivered in the fourth quarter of 2017. 