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LAKE MEAD, Arizona — A tall bleached 'bathtub ring' is visible behind the Hoover Dam on May 12, in Lake Mead National Recreation Area, Arizona. As severe drought grips parts of the Western United States, Lake Mead, which was once the largest reservoir in the nation, has seen its surface elevation drop below 1,080 feet above sea level, its lowest level since the construction of the Hoover Dam in the 1930s. (Photo:AFP)
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