Bois de Sioux River

River in the United States Bois de Sioux RiverThe Bois de Sioux River below the dam of Lake Traverse. Roberts County, South Dakota is at left, and Traverse County, Minnesota is at right.Red River drainage basin, with Bois de Sioux River highlightedPhysical characteristicsSource • locationDam at the foot of Lake Traverse, South Dakota • coordinates45°51′42″N 96°34′23″W / 45.8616667°N 96.5730556°W / 45.8616667; -96.5730556 (Bois de Sioux River origin) Mouth • locationConfluence with the Otter Tail River to form the Red River • coordinates46°15′52″N 96°35′55″W / 46.2644444°N 96.5986111°W / 46.2644444; -96.5986111 (Bois de Sioux River mouth) • elevation951 ft (290 m)Length41 mi (66 km)Basin featuresProgressionBois de Sioux River → Red River → Lake Winnipeg → Nelson River → Hudson Bay → Atlantic OceanGNIS ID640348 The Bois de Sioux River (/ˌbɔɪz də ˈsuː/ BOYZ də SOO) drains Lake Traverse, the southernmost body of water in the Hudson Bay watershed of North America. It is a tributary of the Red River of the North and defines part of the western border of the U.S. state of Minnesota, and the eastern borders of North