Walter Butler Shipbuilders Inc. was a large-scale World War II ship manufacturing shipyard, located at Superior, Wisconsin, United States. Walter Butler purchased the shipyard from Lake Superior Shipbuilding in 1942. Walter Butler Shipbuilders Inc. was at E 1st St, Superior, Wisconsin. The shipyard was located on the western part of Lake Superior. Walter Butler Shipbuilders Inc. was found by Walter Butler in 1942 to build ships for World War II. Walter Butler Shipbuilders Inc., the McDougall Duluth Shipbuilding Company and the Superior Shipbuilding Company 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.