The Parker Dam is located on the border of California and Arizona, some 155 miles south of the Hoover dam. This arch gravity dam was completed in 1938 and is constructed of concrete. The Parker Dam is the deepest dam in the world with a length of 856 feet and a width of 320 feet, of which 235 feet is located below the bed of the river. Parker Dam generates power and supplies water for most areas of Southern California. The reservoir created behind Parker Dam is known as Lake Havasu.