Fish need to cross roads too. But the tunnels built to channel rivers under roads and railways can block their migrations.

Cuba's sustainable approach to farming has protected its rivers from the kind of nutrient pollution that impairs many US waterways.

Efforts to engineer Britain's rivers over the past 75 years have only made flooding worse.

Thousands of dams across the US are aging and overdue for maintenance. Taking them down can revive rivers, restore fish runs and create new opportunities for tourism and outdoor activities.

For every degree of increase in global temperature, there will be about 6 days less of ice per year on rivers that freeze, researchers say.

The path of the Nile River has remained unchanged for about 30 million years. Now scientists know why.

"If you don't know where a hippo goes, how in the world can you design a thoughtful management plan?"

A new simulation shows how changing the incentives for using and storing water could help deal with droughts while also meeting demand.