Ice Harbor Dam
Lake Sacajawea: At elevation 440, Lake Sacajawea extends northeast 32 miles upstream to Lower Monumental Dam, and has a surface area of 9,200 acres. Powerhouse: The Ice Harbor powerhouse contained three 90,000-kilowatt units initially. It now has three additional 111,000-kilowatt units. Power generation through September 1994 was 73.81 billion kilowatt hours. Navigation lock: The lock is a single-lift type with clear plan. It has clear dimensions of 86 feet by 675 feet, and a 15-foot minimum depth.
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The dam is 2,822 feet long, with an
effective height of 100 feet. It is of the concrete gravity type,
with an earthfill embankment section at the north abutment. It has
a ten-bay spillway that is 590 feet long, and ten 50-foot tainter
gates. 