Parker Dam, Arizona

The base of the Parker Dam extends 235 feet below the riverbed, making it the deepest dam in the country. The water held behind this dam on the Colorado River comprises Lake Havasu, the popular recreational site and home to the original London Bridge (crated in England, and shipped to this country by the visionary developer Robert McCullouch). On the lake near the Parker Dam is the Intake Pumping Plant, which is the origin of the Colorado River Aqueduct, one of the primary sources of water for Los Angeles.