Pendleton, city (1990 pop. 15,126), seat of Umatilla co., NE Oreg., on the Umatilla River, in the foothills of the Blue Mts.; founded 1869 on the old Oregon Trail, inc. 1889. A distribution an...

McNary Dam, 7,265 ft (2,214 m) long and 183 ft (56 m) high, on the Columbia River between Oregon and Washington, near Umatilla, Oreg.; built 1947–56 by the U.S. Corps of Engineers. Located at ...

Cayuse, Native North Americans who formerly occupied parts of NE Oregon and SE Washington. They were closely associated with the Nez Percé and spoke a language belonging to the Sahaptin-Chinoo...

Oregon, state in the Pacific Northwest of the United States. It is bordered by Washington, across the Columbia R. (N), Idaho, partially across the Snake R. (E), Nevada and California (S), and ...