Lower Monumental Dam
Lake Herbert G. West: The lake extends up the Snake River for a distance of 28.1 miles to the tailwater of Little Goose Dam. It has a surface area of 6,590 acres, and is at elevation 540. Powerhouse: The powerhouse has six 135,000-kilowatt units. Power generated through September 1996 was 76.8 billion kilowatt hours.
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The
dam is located at the head of Lake Sacajawea, the reservoir created
by Ice Harbor Dam. It is 3,791 feet long, with an effective height
of 100 feet. The dam is a concrete gravity-type dam, with short
earthfill abutment embankments. The eight-bay spillway is 572 feet
long, and has eight 50-foot by 60-foot tainter gates. 