Nation NASA satellite images show Lake Mead water levels plummeting to lowest point since 1937 July 22, 2022Marina Pitofsky and Wyatte Grantham-Philips, USA TODAYComments Off on NASA satellite images show Lake Mead water levels plummeting to lowest point since 1937 As of Monday, Lake Mead, the largest reservoir in the United States, was filled to 27% capacity, according to the NASA Earth Observatory.