Grand River Casino & Resort in Mobridge, South Dakota is owned by the Standing Rock Sioux Tribe and opened in 1994 as a premier gaming destination on the Missouri River. The casino features 250 reel and video slots, video poker and keno games, plus blackjack and poker tables across its gaming floor. The 40-room lodge includes two whirlpool suites with many rooms offering views of Lake Oahe. Additional amenities include The Bay facility with six cabins, a convenience store, campground, two boat ramps, and a fish cleaning station for lake access.