MONTEZUMA COUNTY, Colo. (CBS4) – The Burro Fire almost doubled in size from Saturday to Sunday in Montezuma County.

Officials say the fire grew to nearly 500 acres and is not contained.

READ MORE: No Charges For Colorado Man Who Sent Anonymous Letters, Pictures To School Board Members

Burro Fire (credit: San Juan National Forest)

The fire is 13 miles away from the 416 Fire in Durango. Both fires have prompted several road and trail closures including U.S. 550 and a portion of the Colorado Trail.

LINK: Burro Fire Information

A cause is under investigation.

READ MORE: Douglas County School Board Set To Consider Eliminating Mask Mandate For Students, Staff Tuesday

Crews expect to have this fire fully contained on July 15.

Wildfire Resources

– Visit CBSDenver.com’s Living With Wildfire section.

Wildfire Photo Galleries

MORE NEWS: Report Shows RTD Union Station Problems Festering For Years: 1/3 In Survey Feel Safety At Risk When Using RTD

– See images from the most destructive wildfires (Black Forest, Waldo Canyon, High Park and Fourmile), the deadliest (Storm King) and largest wildfire (Hayman) in Colorado history.