Cheyenne River

The Cheyenne River (Lakota: Wakpá Wašté; "Good River"), also written Chyone, referring to the Cheyenne people who once lived there, 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). About 60% of the drainage basin is in South Dakota and almost all of the remainder is in Wyoming.

This article is about the river in South Dakota and Wyoming. For the Indian Reservation, see Cheyenne River Indian Reservation. For a North Dakota river with the same pronunciation, see Sheyenne River.
Not to be confused with Cheyenne Creek (Colorado) or Cheyenne Creek (South Dakota).
Cheyenne River
Lakota: Wakpá Wašté; "Good River"
Cheyenne River at the I-90 bridge crossing, near Wasta in Pennington County.
Cheyenne River course and watershed.
EtymologyCheyenne Native American Tribe
Location
CountryUnited States
StateWyoming, South Dakota
Physical characteristics
SourceThunder Basin National Grassland
 • locationConverse County, Wyoming
 • coordinates43.425928°N 105.058426°W / 43.425928; -105.058426
MouthLake Oahe / Missouri River
 • location
Ziebach County / Haakon County, South Dakota
 • coordinates
44.723965°N 101.166749°W / 44.723965; -101.166749
Length295 mi (475 km)
Basin size24,240 sq mi (62,800 km2)
Discharge 
 • locationEagle Butte
 • average874 cu ft/s (24.7 m3/s)
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