The Potomac River tops the list as pollution, development, and climate pressures grow.

Salt Creek in Death Valley, California. A new analysis reveals that rivers in arid landscapes are helping to soak up more carbon dioxide than previously thought. “Rivers are one of the most uncertain ...

A Penn State-led research team found that rivers are experiencing heatwaves at higher frequency and intensity than air heatwaves, which could have serious implications for aquatic life — and the lives ...

As bright-colored kayaks push through a thick wall of fog, voices and the beats of drums build as kayakers approach a crowd that has formed on the beach. Applause erupts as the boats land on the sandy ...