Minnesota has Main Ave, N. River and more. The Seven Clans Casino Thief River Falls location boasts a 40, square foot water park with four large water slides, three mini-slides, two hot tubs, a. Casino, room all suite Hotel and Indoor Water Park featuring over slots, 4 Blackjack tables and 2 restaurants. Contents. Lots. Exciting casino floor with over slot machines and 4 blackjack tables. Seven Clans Casino, Thief River Falls is a tribally owned casino hotel situated near Thief River Falls, Minnesota. 7 clans casino hotel prices. Pros: wonderful water park! Loved the lazy river, water slides (only one smaller one was closed), lots of tables, nice splash pad areas for small kids. A mile from Highway 59, this informal casino hotel is 11 miles from downtown Thief River Falls, and 33 miles from Agassiz National Wildlife Refuge. Thief River Falls, MN info. . Welcome to Seven Clans Casinos, the hottest gaming destination of the north! Whether you like playing slots, blackjack or poker, our casino is the place to. 1 History; 2 Property. The casino floor boasts over gaming machines (video slots, poker and keno) and four live blackjack tables so you get Las Vegas action and Northern Minnesota.