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Climate change, drought and high demand are expected to force the first-ever mandatory cuts to a water supply that 40 million people across the American West depend on — the Colorado River.

Dozens of wildfires were burning in hot, dry conditions across the U.S. West, including a blaze touched off by lightning that was moving toward northern Arizona's largest city.

FLAGSTAFF — A lawsuit that accuses the federal government of failing to adequately provide for students on a small, isolated reservation in Arizona is set to go to trial in November. The lawsuit filed in 2017 seeks systematic reforms of ...

Tourists appeared ready to roam Grand Canyon National Park again after it partially reopened Friday, despite objections from Navajo officials and others that it could hurt efforts to control the coronavirus.

The U.S. Forest Service, faced with the slow pace of forest thinning, is seeking proposals to remove dense stands of trees in a wide swath of Arizona to help prevent wildfires.

The Imperial Irrigation District wants $200 million for the Salton Sea, a massive, briny lake in the desert southeast of Los Angeles created when the Colorado River breached a dike in 1905 and flooded a dry lake bed.

The first European American who reached the Colorado River in the Grand Canyon marveled at what was before him: an astounding system of canyons, profound fissures and slender spires that seemingly tottered from their bases.

Two companies that were negotiating to take over a coal-fired power plant on the Arizona-Utah line ended the effort Thursday, saying the challenges were too great.

The U.S. Bureau of Reclamation has been prodding Western states to wrap up drought contingency plans, one each in the lower and upper basins.

American Indian tribes are welcoming an opportunity to offer sports betting in potentially hundreds of casinos across the country after the U.S. Supreme Court cleared the way for states to legalize it.