A new map identifies the third of U.S. rivers most likely to sustain freshwater biodiversity, but almost none of those waterways are protected.

Human activities add large quantities of nitrogen to the environment, much of which gets washed into streams and rivers. These waterways transport some of that nitrogen to the oceans, but they also ...

U.S. Geological Survey researchers developed models to better understand the timing and sources contributing to nutrient ...

When you think about heat waves, you might picture sweltering cities, shimmering asphalt and unbearable summer afternoons. These heat waves dominate the headlines because we feel them directly. Rivers ...