News Headlines WarHorse Casino Omaha construction is on schedule for 2024 opening Novem. For more information, see Nebraska Indian Casinos The Omaha Tribe owns the Lucky 77 Casino in Walthill, the Santee Sioux Tribe owns the Ohiya Casino & Resort in Niobrara, and the Nebraska tribe owns the Prairie Flower Casino in Carter Lake, Iowa. The Winnebago Tribe of Nebraska owns two casinos, the Iron Horse Bar & Casino in Emerson and the Native Star Casino in Winnebago. Four of these casinos are in Nebraska and one is on the state border inside Iowa near Omaha. The new gaming laws also add new types of casino games to all Nebraska casinos. Also, a new casino named Grand Island Casino Resort is under construction at Fonner Park in Grand Island, and a new Harrah's racetrack and casino is coming to Columbus. The Winnebago Tribe is building casino facilities at Horsemen's Park in Omaha, Lincoln Racecourse in Lincoln, and Atokad in South Sioux City. 2020 allowing casino gambling at horse racing tracks. Three gambling ballot measures were passed by Nebraska voters in Nov.