Riverton – Casino gaming in Wyoming begins a new era on May 1, when the Northern Arapaho Tribe opens its full-service Wind River Casino in a new 45,000-square-foot building south of Riverton. The new casino, the state’s largest, will feature 750 Las Vegas-style gaming machines, eight table games, two restaurants, an espresso bar, a gift shop, a separate 4,500-square-foot meeting/conference and entertainment center and a non-smoking gaming area with 70 machines.