Lower Monumental Lock and Dam
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.

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Photo by: U.S. Army Corps of Engineers |  VIRIN: 071019-A-CE999-005.JPG