Grand Canyon National Park is monitoring cyanobacteria in several waterways and advising backcountry visitors how to reduce ...

At the Grand Canyon, benthic types grow on rocks and sediment along the bottoms of streams and waterways, forming mats or mucous balls, officials say.

Wildland firefighters are fighting two blazes in northern Arizona, one of which is threatening structures near the Grand Canyon.

Ground and aerial searches were conducted to locate a missing Utah man in the Grand Canyon.

The ASU student, who was reported missing in April, was on track to receive a master's degree in computer science and had a ...