Homes dot the hills on the southwest side of Lake Mead, Tuesday, April 16, 2013, in Boulder City, Nev. Water levels of the man-made lake, which was created by the damning of the Colorado River at Black Canyon, are expected to drop this summer. Citing drought and demand, advocacy group American Rivers is calling the Colorado River the nation's most endangered waterway. The group's annual report follows a federal Bureau of Reclamation study that says that over the next 50 years the Colorado River will run short of supply for the more than 40 million people it serves in Arizona, California, Colorado, Nevada, New Mexico, Utah and Wyoming. (AP Photo/Julie Jacobson)

Associated Press
Homes dot the hills on the southwest side of Lake Mead, Tuesday, April 16, 2013, in Boulder City, Nev. Water levels of the man-made lake, which was created by the damning of the Colorado River at Black Canyon, are expected to drop this summer. Citing drought and demand, advocacy group American Rivers is calling the Colorado River the nation's most endangered waterway. The group's annual report follows a federal Bureau of Reclamation study that says that over the next 50 years the Colorado River will run short of supply for the more than 40 million people it serves in Arizona, California, Colorado, Nevada, New Mexico, Utah and Wyoming.  (AP Photo/Julie Jacobson)
Homes dot the hills on the southwest side of Lake Mead, Tuesday, April 16, 2013, in Boulder City, Nev. Water levels of the man-made lake, which was created by the damning of the Colorado River at Black Canyon, are expected to drop this summer. Citing drought and demand, advocacy group American Rivers is calling the Colorado River the nation's most endangered waterway. The group's annual report follows a federal Bureau of Reclamation study that says that over the next 50 years the Colorado River will run short of supply for the more than 40 million people it serves in Arizona, California, Colorado, Nevada, New Mexico, Utah and Wyoming. (AP Photo/Julie Jacobson)
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