The Heart Mountain Division of the Shoshone Project receives irrigation water directly from Buffalo Bill Reservoir through the Shoshone Canyon Conduit, a three-mile-long tunnel drilled through Cedar Mountain. From the conduit, the water passes over the Shoshone River through the Shoshone River Siphon and into the twenty-eight-mile-long Heart Mountain Canal, then through a short tunnel in Rattlesnake Mountain, across the river, and into the Heart Mountain Canal System. Completed in 1938, the siphon is 1,640 feet long and at the time of construction was the longest self-supporting pipe span in the world. About 31,120 acres are irrigated on the Heart Mountain Division, which was settled beginning in 1946. The Heart Mountain Power Plant, one of four hydropower generating facilities using water from Buffalo Bill Dam, has a generating capacity of 6,900 kVA. On February 10, 1904, the Secretary of the Interior set aside $2,250,000 for the initial construction of the Shoshone Project, one of the first federal reclamation projects in the nation and the largest federal project in Wyoming. The project was settled in four divisions: Garland in 1907, Frannie in 1917, Willwood in 1927, and Heart Mountain in 1946. Today, the project comprises 93,000 acres, with major crops including alfalfa hay, sugar beets, dry edible beans, malting barley, and specialty crops.