A patrol boat makes its way upstream along the Colorado River in Black Canyon just south of Hoover Dam, Friday, April 12, 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
A patrol boat makes its way upstream along the Colorado River in Black Canyon just south of Hoover Dam, Friday, April 12, 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)
A patrol boat makes its way upstream along the Colorado River in Black Canyon just south of Hoover Dam, Friday, April 12, 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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