Grand River
Born where its two forks meet in Shadehill Reservoir, the Grand flows east across northern South Dakota through the Standing Rock Sioux Reservation, its last miles forming an arm of Lake Oahe just above Mobridge.
Course of the river, simplified. Map data from Natural Earth (public domain).
Weather at the Grand River (National Weather Service) ↗
River facts
| Length | About 110 miles |
|---|---|
| Source | North and South forks meet at Shadehill Reservoir, Perkins County, SD |
| Mouth | Missouri River (Lake Oahe) near Mobridge, South Dakota |
| State | South Dakota |
Boat ramps, launches and bait shops
Detailed ramp, bait shop and lock-and-dam listings for the Grand River are coming soon. Until then, these searches open Google Maps along the river:
Fishing regulations
Check the state agency for river-specific rules, seasons and limits before you fish:
- South Dakota: South Dakota Department of Game, Fish and Parks ↗
Lakes on or near the Grand River
Lakes in our guide on or near this river:
Facts from Grand River (Wikipedia) ↗