New research finds the Upper Colorado River Basin lost an estimated 4.6 trillion gallons of groundwater during a severe ...

Arizona is pushing back on a plan for Colorado River water cuts by joining Nevada's lawsuit against the federal government.

The two largest reservoirs in the US have dropped to unprecedented lows as drought grips the Southwest, but groundwater ...

The Central Utah Project and other transbasin diversions bring Colorado River water to the Wasatch Front. If Utah has to cut ...

Watch how a century-old mistake and a continuing drought have pushed the Western water supply to the brink—and what overhauls ...

Declining Colorado River flows and falling water levels at Lake Powell and Lake Mead are highly visible signs of the ...

Rep. Greg Stanton says “Arizona got screwed” in the new Colorado River water deal, which is why the state joined a lawsuit to ...

Lake Powell is about 22% full. What does that mean for the Colorado River and the millions who rely on it?

A new study found that groundwater in the Upper Colorado River Basin declined more sharply than in the Lower Basin during a ...

The Grand Canyon State sues over Trump administration rules that would sharply reduce the amount of water Arizona receives from the river.

California's Salton Sea was created after an irrigation project along the Colorado River went wrong in 1905. The California ...

Under the new federal plan, Arizona would absorb a 760,000 acre-feet cut per year, representing roughly 27% of its full ...