Cheyenne River Lakota: Wakpá Wašté; "Good River" | |
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![]() Cheyenne River course and watershed. | |
Etymology | Cheyenne Native American Tribe |
Location | |
Country | United States |
State | Wyoming, South Dakota |
Physical characteristics | |
Source | Thunder Basin National Grassland |
• location | Converse County, Wyoming |
• coordinates | 43°25′33″N 105°03′30″W / 43.425928°N 105.058426°W |
Mouth | Lake Oahe / Missouri River |
• location | Ziebach County / Haakon County, South Dakota |
• coordinates | 44°43′26″N 101°10′00″W / 44.723965°N 101.166749°W |
Length | 295 mi (475 km) |
Basin size | 24,240 sq mi (62,800 km2) |
Discharge | |
• location | Eagle Butte |
• average | 874 cu ft/s (24.7 m3/s)[1] |
The Cheyenne River (Lakota: Wakpá Wašté; "Good River"[2]), also written Chyone,[3] referring to the Cheyenne people who once lived there,[4] is a tributary of the Missouri River in the U.S. states of Wyoming and South Dakota. It is approximately 295 miles (475 km) long and drains an area of 24,240 square miles (62,800 km2).[5] About 60% of the drainage basin is in South Dakota and almost all of the remainder is in Wyoming.[6]
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: CS1 maint: archived copy as title (link) Cheyenne River Phase I TMDL Assessment