Lower Granite Dam

The 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