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Lauren Sommer, KQED
Environment
One of the worst recorded droughts in human history has stretched water supplies thin across the far-reaching Colorado River basin, which serves 40 million people.
By Grace Hood and Lauren Sommer, KQED
<p>A riverboat glides through Lake Mead on the Colorado River at Hoover Dam near Boulder City, Nev., in this photo from October 2015.</p> <p>A riverboat glides through Lake Mead on the Colorado River at Hoover Dam near Boulder City, Nev., in this photo from October 2015.</p>