The 12 Tribes Resort & Casino is the second attempt to build a casino near Omak. This $68 million casino is the Tribe's fourth casino joining Mill Bay Casino in Manson, Okanaogan Casino in Okanaogan and Coulee Dam Casino in Coulee Dam, Washinton. The Colville Confederated Tribe celebrated its ground-breaking on Jand its grand-opening on June 17, 2015. The casino is an Indian gamng casino that sits on 40 acres of tribal land between the Tribes' gas/convenience store and the small town of Omak. 12 Tribes Omak Casino Hotel is located off of U.S.