Great Lakes Dredge & Dock Corp. engages in the provision of dredging services. The company is headquartered in Oak Brook, Illinois and currently employs 426 full-time employees. The company went IPO on 2006-12-27. The firm provides dredging services in the United States. The firm operates three types of dredging equipment: hopper dredges, hydraulic dredges and mechanical dredges. Its dredging generally involves the enhancement or preservation of the navigability of waterways or the protection of shorelines through the removal or replenishment of soil, sand or rock. Domestically, its work generally is performed in coastal waterways and deep-water ports. Its United States dredging market consists of four primary types of work: capital, coastal protection, maintenance and rivers and lakes. The company operates three principal types of dredging equipment: hopper dredges, hydraulic dredges and mechanical dredges. Its domestic dredging fleet is positioned on the East and Gulf Coasts, with a smaller number of vessels positioned on the West Coast, and with many of the rivers and lakes dredges on inland rivers and lakes.