The McDougall Duluth Shipbuilding Company was a large-scale wartime ship manufacturing shipyard, located at the city of Riverside, near Duluth. McDougall Duluth Shipbuilding was at 110 Spring Street, Duluth, Minnesota, now the site of the West Duluth's Spirit Lake Marina. The shipyard was located on St. Louis River Estuary at western part of Lake Superior. McDougall Duluth Shipbuilding Company was found by Alexander McDougall (1845-1923) in 1917 to built ships for World War I. McDougall Duluth Shipbuilding Company and the Superior Shipbuilding Company (now Fraser Shipyards) were called the Twin Ports shipbuilding industry of Minnesota and Wisconsin. Once built the ships can travel to the Atlantic Ocean through the Great Lakes and the Saint Lawrence Seaway.