About the Show
It took five years to build. When completed in 1936, Hoover Dam was one of the world's largest hydroelectric facilities. Today, it generates 4 billion kilowatt-hours of energy a year, enough to serve 1.3 million people. An astonishing 660 feet thick at its base, the dam needs to be strong enough to store up to two years' worth of the Colorado River's average water flow.


Never miss a Nat Geo moment

Your email address
We use our own and third-party cookies to improve our services, personalise your advertising and remember your preferences. If you continue browsing, or click on the accept button on this banner, we understand that you accept the use of cookies on our website. For more information visit our Cookies Policy AcceptClose cookie policy overlay