06
Arizona Spillway and Highway Bridge, Boulder Dam
Two giant Spillways which will be used during flood periods when it is deemed advisable to lower the surface of the reservoir, are known as the Arizona and Nevada Spillways. They have an approximate length of 650 feet, 150 ft. wide at the top and an average depth of 125 ft. The largest battleship could be floated in this structure, if the shaft at the end of Spillway were dammed at the portal.