McNary: Columbia River, OR/WA
Owner: U.S. Army Corps of Engineers
Type: Federal
Year Started: 1953
Location: Columbia River
State: Oregon, Washington
Capacity: 990.5 MW
McNary Web Page
McNary Dam is a 1.4-mile (2.2-km) long concrete gravity run-of-the-river dam which spans the Columbia River. It joins Umatilla County, Oregon with Benton County, Washington, 292 miles (470 km) upriver from the mouth of the Columbia at Astoria, Oregon. The dam provides for slackwater navigation, hydroelectric power generation, recreation, wildlife habitat, and incidental irrigation.