Completed in 1904, Milner Dam raised the Snake River 38 feet to divert water into major north and south side canals. An unmatched gravity system in national reclamation development, the project irrigates 360,000 acres of land. Twin Falls, Jerome, and a half dozen other communities suddenly sprang up in a desert plain watered by 160 miles of main canals. Located on lava channels formed by two rock islands, Milner Dam's three segments, 462, 404, and 280 feet in length, were built by four locally powered electric cranes that were an engineering marvel of that time.