Hikers make their way along the banks of the Colorado River in Black Canyon south of Hoover Dam, Sunday, April 14, 2013, near Willow Beach, Ariz. 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
Hikers make their way along the banks of the Colorado River in Black Canyon south of Hoover Dam, Sunday, April 14, 2013, near Willow Beach, Ariz. 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)
Hikers make their way along the banks of the Colorado River in Black Canyon south of Hoover Dam, Sunday, April 14, 2013, near Willow Beach, Ariz. 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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