The San Carlos Lake closed on Friday due to a health and safety hazard caused by dead fish. Some activities, like fishing, are prohibited until further notice.

The tool will categorize dust storms based on dust concentration, but will also measure wind speed and area covered.

The study looked into the "gleam-glum effect" on how certain phonetic sounds trigger emotional responses in 5-year-olds versus adults.

The discovery of the black hole will require new theories for how black holes formed in the early universe.

A small section of the Salt River is wet and lush only minutes from downtown Phoenix. The area near the Rio Salado Audubon Center is rare oasis of water in the mostly-dry river bed.

A new initiative aimed at providing gynecologic and reproductive health care to queer individuals is launching later this year.

An agreement with the San Diego County Water authority could allow Arizona to benefit from desalinated ocean water to help deal with shortages on the Colorado River.

Water experts are calling for urgent changes at Lake Powell and Lake Mead, as a dry winter could send reservoir levels dangerously low.

State and federal agencies across Arizona have put fire restrictions in place, as the danger of wildfires increases with hot and dry conditions.

Wildfire risk is rising across the West after a dry winter and ongoing drought left vegetation more vulnerable to fire. Now, researchers at the University of Nevada, Reno are putting about $3.5 million in federal funding to work on a project aimed at reducing that risk in the eastern Sierra Nevada.

Phoenix’s average temperature for March, April and May was 80.2 degrees, which is 6.4 degrees above normal.

The estimate pops up again and again in reporting on the West's most important waterway, but one researcher thinks it might be slightly high. That might point to a bigger problem.