When it was created in 1935 by the building of the Hoover Dam, Lake Mead was the largest artificial lake in the world.
But the glorious Nevada lake, which has provided decades of water sports and boating, has lost 4 trillion gallons of water in the past 14 years.
Satellite photos that chart the effect of a drought that began in 2000 and is starting to threaten the Las Vegas water supply reveal the dramatic extent to which the reservoir has dried up.
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