The water in the largest U.S. reservoir has sunk to a record low, due to the severe drought in the American Southwest. Lake Mead, in Nevada, had dropped 10 feet in three months. With an average depth of 1,084 feet in February, last week the reservoir measured only 1,074 feet deep, or only 37 percent of capacity, according to the U.S. Bureau of Reclamation. The manmade lake — formed during the Great Depression by the blocking of the Colorado River with Hoover Dam — has […]