Below Mount Jefferson and McKenzie Pass is a massive storehouse of water three times the size of Lake Mead, say Oregon researchers.

Get comprehensive coverage of the California issues you care about the most in one free, weekly email. Sign up for WeeklyMatters. Map of active wildfires burning across California. Explore the history ...

Arizona is gearing up for a potential legal showdown to safeguard its water rights amid growing tensions over the Colorado ...

In the United States and across the globe, experts are raising alarms about the possibility of water demand exceeding supply ...

A rocky start to the year has put water flows through America's second-largest reservoir on track to decline, unless ...

Absent intervention by state wildlife officials, Nevada’s state animal, the desert bighorn sheep, may see its herds thinned ...