Cheyenne River catchment area
|Water code||US : 1267017|
|location||Wyoming , South Dakota (USA)|
|River system||Mississippi River|
|Drain over||Missouri River → Mississippi River → Gulf of Mexico|
|source||The confluence of Antelope Creek and Dry Fork Creek in eastern Wyoming
|muzzle||in the Missouri River dammed up to Lake Oahe
|Catchment area||62,800 km²|
|Left tributaries||Rapid Creek , Belle Fourche River|
|Reservoirs flowed through||Angostura Reservoir|
View of the Cheyenne River from I-90
It rises in northeast Wyoming, more precisely in the Thunder Basin National Grassland in northeast Converse County . It then flows eastward to South Dakota, past Edgemont , flows around the southern end of the Black Hills and crosses the reservoir Angostura Reservoir , which was created by the Angostura dam .
On the east side of the Black Hills it flows northeast, past Oral , the Buffalo Gap National Grassland and along the northwest border of the Pine Ridge Reservation and Badlands National Park . The Rapid Creek flows like the Belle Fourche River in the east of Meade County . It then flows northeast along the southern border of the Cheyenne River Reservation . At Cherry Creek which flows Cherry Creek in Cheyenne. It finally flows into the Missouri in Lake Oahe, 50 km northwest of Pierre .