The dramatic shift is a warning sign—and scientists say the changes that aren't yet visible to the naked eye are just as ...

The biggest rivers in the U.S. are the lifeblood of the regions they flow through. They provide drinking water, irrigation for agricultural lands and a habitat where important ecosystems can thrive.

The Snake River in the Pacific Northwest was listed as the nation's most endangered river, according to a report released by the environmental advocacy group American Rivers back in 2021. The river ...