The lightning-sparked South Rim fire in Black Canyon of the Gunnison National Park has burned 3,556 acres with no containment and mandatory evacuations remain in place.

Firefighters are trying to contain several more fires on the Western Slope, and air quality alerts are in effect for much of the state.

Wildfires have forced evacuations at two U.S. national parks in the West as summer monsoon storms increase lightning in the region.