Nevada's Lake Mead, the largest capacity reservoir in the US, hit a low point Sunday and it's expected to dwindle even further by the end of the summer.
The river that feeds Lake Mead, the Colorado, has been experiencing a 14-year drought. It's the most important source of water in the west, supplying cities and farmers in seven states and Mexico.
Jay Famiglietti, senior water scientist at NASA's JPL joins the show to put the situation in perspective.