Big Sioux River upstream end (OSM) to Big Sioux River downstream end (OSM)
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● Big Sioux River downstream end (OSM)
Big Sioux River
SD • US
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The Big Sioux River is a tributary of the Missouri River in eastern South Dakota and northwestern Iowa in the United States. It flows generally southwardly for 419 mi (674 km), and its watershed is 9,006 mi2 (23,330 km2). The United States Board on Geographic Names settled on "Big Sioux River" as the stream's name in 1931. The river is named after the Lakota people, who have known it as Tehankasandata, or Thick Wooded River.
The Big Sioux River rises in Roberts County, South Dakota, on a low plateau known as the Coteau des Prairies and flows generally southwardly through Grant, Codington, H...
418.8 mi total
1 sections
2 access points
0 camps
0 rapids
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Click any point for details. Sections without stored geometry are drawn as straight put-in → take-out lines — actual courses follow the river.