Grand River Casino and Resort near Mobridge opened in March 1994, and has worked hard to maintain a high level of gaming quality and service. The Casino is owned by the Standing Rock Sioux Tribe. You can choose from 250 reel and video slot machines, as well as blackjack and poker. A variety of dining options are available with the River’s Edge restaurant as well as an all-you-can-eat buffet. Our 40-room lodge includes two whirlpool suites.