Come play with us. Grand River Casino and Resort has 250 reel and video slots to choose from as well as a 40-room lodge and a variety of food options from the River's Edge restaurant. Plus the entire property is now smoke-free! The Bay at Grand River is just down the hill from the casino and includes six cabins, more than 70 campsites with electrical hookups, showers, RV dump station, a playground, convenience store and two boat ramps with access to Lake Oahe. The Mobridge, SD area boasts excellent hunting and Lake Oahe's fishing is some of the best in the region. GRAND RIVER CASINO & RESORT time to play. Owned by the Standing Rock Sioux Tribe 4 miles west of Mobridge on Hwy 12 grandrivercasino.com Come play with us . Grand River Casino and Resort has 250 reel and video slots to choose from as well as a 40 - room lodge and a variety of food options from the River's Edge restaurant . Plus the entire property is now smoke - free ! The Bay at Grand River is just down the hill from the casino and includes six cabins , more than 70 campsites with electrical hookups , showers , RV dump station , a playground , convenience store and two boat ramps with access to Lake Oahe . The Mobridge , SD area boasts excellent hunting and Lake Oahe's fishing is some of the best in the region . GRAND RIVER CASINO & RESORT time to play . Owned by the Standing Rock Sioux Tribe 4 miles west of Mobridge on Hwy 12 grandrivercasino.com