Moreau River

Moreau River
Location of the Moreau River (colored turquoise)
Data
Water code	US :  1265832
location	South Dakota (USA)
River system	Mississippi River
Drain over	Missouri River  → Mississippi River  → Gulf of Mexico
source	in Harding County 45 ° 8 ′ 42 ″  N , 102 ° 49 ′ 51 ″  W.
muzzle	in the Missouri River dammed up to Lake Oahe coordinates: 45 ° 21 ′ 19 ″  N , 100 ° 22 ′ 31 ″  W 45 ° 21 ′ 19 ″  N , 100 ° 22 ′ 31 ″  W
length	320 km
Communities	Usta , Iron Lightning , Thunder Butte , Green Grass , Whitehorse
Moreau River near Whitehorse

The Moreau River is a right tributary of the Missouri River and is approximately 200 miles long. It flows in the US state of South Dakota .

The Santee-Dakota of the Cheyenne River Sioux Tribe called the Hinhan Wakpa - 'Owl River'. The river rises in two creeks in the Badlands of Harding County . The source of the southern arm is about 20 miles west of the source of the northern arm, which rises near Crow Buttes . The two arms run in the ESE direction and converge in south Perkins County . The Moreau River flows through the Cheyenne River Indian Reservation , past the towns of Usta , Iron Lightning , Thunder Butte , Green Grass and Whitehorse . It flows into the Missouri in Lake Oahe .