Not only is Lake Powell's water level plummeting because of drought, its total capacity is shrinking, too Lake Powell, the second-largest human-made reservoir in the US, has lost nearly 7% of its potential storage capacity since 1963, when Glen Canyon Dam was built, a new report shows. #press https://www.cnn.com/2022/03/21/us/lake-powell-capacity-shrinking-drought-climate/index.html?utm_source=press.coop https://cdn.cnn.com/cnnnext/dam/assets/220321144911-lake-powell-utah-062421-file-super-169.jpg