formerly Boulder Dam
Highest concrete arch dam in the U.S., built on the Colorado River at the Arizona-Nevada border.
It impounds Lake Mead . The dam, completed in 1936, is used for flood and silt control, electric power, irrigation, and domestic and industrial water supplies. It is 726 ft (221 m) high and 1,244 ft (379 m) long (along the crest), has a power capacity of 1,345 megawatts, and a volume of 4.4 million cu yd (3.36 million cu m).