[an error occurred while processing this directive]
4 of 12
Photograph by Adriel Heisey
A bathtub ring of bleached rock—a sign of severe drought—lines Lake Powell, the country's second largest man-made lake and canteen for much of the Southwest. Five years of drought and demand from distant cities has depleted the lake's reserves to their lowest point since 1969. "This is the driest five years we've seen for a century," says Tom Ryan, a hydrologist with the U.S. Bureau of Reclamation, the agency that monitors the lake.