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EncyclopediaJohn Day DamJohn Day Dam, 219 ft (67 m) high and 5,640 ft (1,719 m) long, on the Columbia River between Oregon and Wash.; built between 1959 and 1968 by the U.S. Army Corps of Engineers. It is an extremely large generator of hydroelectric power. The dam's reservoir regulates navigation upstream; locks provide ship passage from The Dalles Dam reservoir to McNary Dam (see Columbia basin project). The Columbia Electronic Encyclopedia, 6th ed. Copyright © 2007, Columbia University Press. All rights reserved. More on John Day Dam from Infoplease:
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- Washington: Temperature Extremes - Washington: Temperature Extremes Month Maximum °F Year Place Minimum °F Year Place Jan. 74 ...
- Oregon, state, United States: Economy - Economy Oregon's major sources of farm income are greenhouse products, wheat, cattle (huge ...
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