View Lewis and Clark exhibits and interpretation by the tribes who greeted the Corps in the Columbia plateau region. Hear stories of the Cayuse, Umatilla and Walla Walla tribes, who own and operate the facility together as the Confederated Tribes of the Umatilla Indian Reservation. While you’re there, visit the Wildhorse Resort and Casino. Off Hwy 331, five miles east of Pendleton, Oregon.