Seven Clans Casinos water park under construction Bonnie Meibers, Grand Forks Herald · February 20, 2019 at 5:51 pm A $1.8 million renovation to a Thief River Falls water park is underway. Seven Clans Casinos recently completed renovations of its restaurant and hotel, and said in a release the water park renovation is “the last pieces of the puzzle.” During the renovation, the arcade, hotel and casino are still open. The water park renovation will include the addition of a toddler-friendly area with a splash pad, coin operated lockers and a rock climbing wall. The rock wall will have a seperate fee and can have as many as three climbers on it at a time. Fischer Brother’s LLC, based in Chippewa Falls, Wis., is doing the renovation.