The American West is drying up

Locals call it the “bathtub ring”. A white strip more than 150 feet tall encircles the turquoise surface of Lake Mead, America’s largest reservoir, showing visitors how high the water once was, and how far it has fallen. The shrinking of Lake Mead and Lake Powell, its sister reservoir upriver, is perhaps the most visible manifestation of the 22-year megadrought that has gripped the American West. The water levels of both have reached record lows. Dip a toe into Lake Mead and it feels shockingly warm for such a large body of water. The canyons drowned when Lake Powell was filled in the 1960s are slowly revealing themselves.