Great Lakes Dredge and Dock Company is an American company providing construction services in dredging and land reclamation, currently the largest such provider in the United States. GLD&D operates primarily in the United States but conducts one-quarter of its business overseas. It is currently based in Oak Brook, Illinois. The company was founded in 1890 as the partnership of William A. Lydon & Fred C. Drews and was named Lydon & Drews dredging company. Early projects included the shoreline structures for the Chicago's Columbian Exposition. The company soon had satellite... operations throughout the Great Lakes. It was renamed the Great Lakes Dredge and Dock Company in 1905. Between 1900 and 1950, GLD&D undertook major projects such as the Sabin Lock, straightening of the Chicago River west of the Chicago Loop, the Michigan Avenue Bridge, foundation landfill and reclamation of the area where the Adler Planetarium & Astronomy Museum, Soldier Field, Meigs Field and Field Museum of Natural History stand today in Chicago and harbor work for the Naval Station Great Lakes. During the Second World War, GLD&D constructed the MacArthur Lock.
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| NASDAQ symbol: | GLDD |
| Founded: | 1890 |
| Headquarters: | Oak Brook, Illinois |
| Legal structure: | Public company |
| Annual revenue: | $586,880,000 |
| Net income: | $4,980,000 |
| Operating income: | $26,100,000 |
| Market cap: | $510,000,000 |
| Industries: | Heavy and Civil Engineering Construction |