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Michael Pace

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High water cover the road in the Box Town neighborhood as a waste can floats Sunday, May 8, 2011 in Memphis, Tenn. as flood waters continue to rise along the Mississippi River. (AP Photo/Wade Payne) (AP)

US rivers are becoming saltier — and it’s not just from treating roads in winter

Sujay Kaushal, Gene E. Likens, Michael Pace, Ryan Utz