A wildfire in rugged terrain in the San Isabel National Forest grew to 100 acres Thursday.
There were structures in the area, but it was unclear whether any were threatened, said Larry Helmerick, a spokesman for the Rocky Mountain Area Coordination Center. No evacuations have been ordered.
''We hope it's going to settle down tonight,'' Helmerick said.
The fire was reported Wednesday night in Custer County, about three miles southeast of Wetmore and 100 miles south of Denver. It had been estimated at 20 acres earlier Thursday.
The blaze was caused by lightning and was burning in oak brush and ponderosa pine, Helmerick said.
Three heavy air tankers, two single-engine air tankers and a helicopter were helping firefighters on the ground. A 10-person crew planned to join the effort overnight and three other 20-person crews were requested, Helmerick said.
A 1,000-acre wildfire burning since June 23 about 10 miles southeast of Pagosa Springs in Archuleta County was being allowed to burn to thin out dead brush and trees not native to the area.
On the Net:
Rocky Mountain Area Coordination Center: www.fs.fed.us/r2/fire/rmacc.html
