Hagerman National Fish Hatchery
Pacific Region
 
 

Lower Snake River Dams

Lower Granite
Little Goose
Lower Monumental
Ice Harbor


Lower Granite Dam

Lower Granite DamThe dam is located at the head of Lake Bryan, about 3,200 feet long with an effective height of 100 feet. The dam is a concrete gravity type, with an earthfill right abutment embankment. It includes a navigation lock with clear dimensions of 86 by 674 feet; and an eight-bay spillway that is 512 feet long, with eight 50-foot by 60.5-foot radial gates.

Lower Granite Lake: The lake extends up the Snake River about 39.3 miles to Lewiston, Idaho, the upper terminus of the authorized Lower Snake River slack-water navigation project. It lies at elevation 738, and has a surface area of 8,900 acres.

Powerhouse: The powerhouse has six 135,000-kilowatt units. Power generated through September 1996 was 76.80 billion kilowatt hours.

 

Lower Granite Lake Recreation Areas

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Little Goose Dam

Little Goose Dam: The dam is 2,655 feet long with an effective height of 98 feet. It is located at the head of Lake West, the reservoir formed by Lower Monumental Dam. The dam is the concrete gravity type, with an earthfill right abutment embankment. It includes a navigation lock with clear dimensions of 86 by 675 feet; and an eight-bay spillway that is 512 feet long and has eight 50-foot by 60-foot tainter gates.

Lake Bryan: Lake Bryan lies directly behind Little Goose Dam. It extends about 37.2 miles up the Snake River, until it reaches Lower Granite Dam. It lies at elevation 638, and has a surface area of 10,025 acres.

Powerhouse: The powerhouse has six 135,000-kilowatt units. Power generated through September 1996 was 73.18 billion kilowatt hours.

 

Lake Bryan Recreation Areas

 

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Lower Monumental Dam

Lower Monumental DamThe 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.

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.

 

Lake West Reservoir and Recreation Areas

 

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Ice Harbor Dam

Ice Harbor DamThe 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.

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.

 

Lake Sacajawea Recreation Areas

 

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Last updated: August 20, 2013

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