The $45 million project was completed in October 2011. Work begin in 2010 to expand the hotel by 202 rooms with a ten-story tower, and add 24,000 square feet (2,200 m 2) to the casino. Because of this change, a lounge, Wildhorse Sports Bar, opened in May 2007. After contentious discussion within the tribal community, the previously 'dry' (not serving alcoholic beverages) resort, located on a dry reservation, began serving alcoholic beverages on May 5, 2006. The resort has expanded each year since its beginning, doubling the size of the casino in 20, adding a conference center in 2004, completely renovating its 100-room hotel in 2005 and expanding in 2006-07 to add four food and beverage venues: a buffet restaurant, a fine-dining restaurant, a sports bar, a coffee shop and a 24-hour restaurant. The casino opened in temporary buildings on November 5, 1994, run by Capital Gaming International Inc., with the tribe taking over as managers in 1999.

It is located 5 mi (8 km) east of Pendleton, on the Umatilla Indian Reservation, near Interstate 84. Wildhorse Resort & Casino is a casino owned and operated since 1994 by the Confederated Tribes of the Umatilla Indian Reservation in the U.S. Class=notpageimage| Location in Oregon Wildhorse Resort and Casino