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Image: U.S. Army Corps of Engineers official photograph Share
This congressionally authorized project includes Lower Monumental Dam, powerhouse, navigation lock, two fish ladders, a juvenile fish facility (JFF), and appurtenant facilities providing for navigation, hydroelectric generation, recreation, and irrigation. The dam is located at the head of Lake Sacajawea, the reservoir created by Lower Monumental Dam. It is 3,791 feet long, with an effective height of about 100 feet. The dam is a concrete gravity-type dam, with earthfill abutment embankments.