A wildfire burning in Grand Canyon National Park triggered a chlorine gas leak Friday afternoon after flames reached a water ...

Colorado’s lakes serve as a needed respite during sweltering summer days, but as the days become warmer the state’s lakes are becoming more susceptible to toxic blooms of algae.

Investigators say Edward McClure injected Jesus Lopez Barcenas with a sedative before doing a proper medical assessment ...

Colorado's mountain streams are facing a "real challenge" from a rising concentration of heavy metal levels. These rising levels are only worsening with climate change, a new study found.

A new round of samples shows the Colorado River "positive" overall for zebra mussels, as state officials scramble to contain ...

A new report from the conservation group American Rivers names a stretch of the Colorado River, the Ohio River and eight other rivers as endangered.

As climate change and overuse threaten the Colorado River, Native American tribes seek a larger role in the river's stewardship.

The environmental group is trying to halt a new deal to reduce water taken from the river, saying it could accelerate the release of toxic dust in towns along the Salton Sea.

Suzette, also a former river guide along for our float, had hiked to the headwaters of the Colorado and collected river water, while John got some from the Green, and then during their barefoot ...

As climate change bakes the U.S. West and dries up key Colorado River reservoirs, a slew of invasive species is flourishing in warmer waters at the expense of the artery’s native inhabitants ...

As the Interior Department considers how to reduce water consumption from the Colorado River Basin, tensions are rising in Western states.

A new report from the conservation group American Rivers names a stretch of the Colorado River, the Ohio River and eight other rivers as endangered.