Lucky Peak Dam
Lucky Peak Dam is a rolled earth and gravel fill dam on the Boise River in Ada County, Idaho, U.S.A.. At the time of its construction in the early 1950s, its primary purpose was flood control, with a secondary purpose of irrigation. Hydroelectric power generation was added in 1988. The normal operating elevation of the full reservoir is 3055 feet (931 m) above sea level, the empty reservoir's elevation (Boise River) is 2824 feet (861 m). Construction began in November 1949 by the U.S. Army Corps of Engineers, and the dam was operational in 1955. The resulting reservoir is named Lucky Peak Lake. Most of the federal dams in southern Idaho, including the others on the Boise River, were built by the Bureau of Reclamation. The Idaho Power Company, a private utility, built multiple hydroelectric dams on the Snake River. Lucky Peak Dam is located along State Highway 21, 10 miles (16 km) upstream from the city of Boise, and below the older concrete arch Arrowrock Dam, completed in 1915. Originally built without hydroelectric power generation, the construction of the Lucky Peak powerhouse was begun in 1984 and became operational in 1988, generating electricity primarily for Seattle City Light.