McNary Dam

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 the head of the slack-water pool created by John Day Dam, it provides slack-water navigation 61 mi (98 km) upstream to the mouth of the Snake River locks permit vessels to pass around the dam. McNary Dam is one of the largest hydroelectric power facilities in the United States.

The Columbia Electronic Encyclopedia, 6th ed. Copyright © 2012, Columbia University Press. All rights reserved.

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The Columbia Electronic Encyclopedia, 6th ed. Copyright © 2012, Columbia University Press. All rights reserved.