Umatilla Indian Reservation

Rattlesnake Pete from the Umatilla Indian Reservation

The Umatilla Indian Reservation is an Indian reservation in eastern Oregon in the United States, mostly located in Umatilla County, with a very small part extending south into Union County. The reservation is owned by the Confederated Tribes of the Umatilla Indian Reservation.

The reservation has a land area of 702.009 km² (271.047 sq mi) and a population of 2,927 as of the 2000 census. The largest community is Mission.

Located near the city of Pendleton on the north side of the Blue Mountains, the reservation was established for three Sahaptin-speaking Native American tribes who traditionally inhabited the Columbia Plateau region: the Cayuse, Umatilla, and Walla Walla. The tribes share land and a governmental structure as part of their confederation.

The reservation has a casino on Interstate 84, the Wildhorse Casino Resort. The Tamástslikt Cultural Institute provides a historical exhibit about the reservation and the three tribes, as well as exhibits of Native American arts and traditional craftwork.