Rapid growth on the South Rim fire in Black Canyon of the Gunnison National Park forced immediate evacuations in Montrose County on Saturday afternoon.

A wildfire that's burning in the southern part of Black Canyon of the Gunnison National Park in western Colorado has grown to more than 1,600 acres. It has damaged some park equipment and several outbuildings.

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