New data shows that water levels in major reservoirs including Lakes Mead and Powell are well below average for this time of year.

A salt crisis is looming for U.S. rivers The biggest source of salty freshwater in D.C. and other major northern inland cities is an overapplication of road salt to thaw winter ice, which runs off ...

The tiny nation has more than 100 smaller dams. The United States has more than 250,000 rivers totaling of about 3.5 million miles.