Megastructures

Hoover Dam (2006x7)

Air date: May 16, 2006

Exploring Nevada's Hoover Dam in Black Canyon on the Colorado River. The 726-foot dam weighs more than 6,600,000 tons and is 660 feet thick at its base. Completed in 1936, it can store up to two years' worth of the Colorado's average water flow, and generates four billion hours of hydroelectric power a year.