Efforts were underway Monday to clear vegetation around a brush fire that has burned 4,871 acres near the Cogswell Dam in the Angeles National Forest north of Azusa.
The fire was reported at 12:22 p.m. Sunday near the dam and West Fork Day Use area, according to a Los Angeles County Fire Department dispatcher.
As of Monday morning, the blaze — dubbed the “Bobcat Fire” — was still 0% contained, fire officials said.
Structures were threatened, according to Angeles National Forest officials, who said five engines, three hand crews, four helicopters, five fixed-wing aircraft and two water tenders were assigned to the fire.
Caltrans reported State Route 39 was closed in both directions from El Encanto Park near Cogswell Dam and the West Fork Picnic Area and Bridge.
A temporary flight restriction was in place over the fire area, and smoke was fouling the air in parts of L.A. County Sunday evening.
Temperatures in the forest were well above 100 degrees on Sunday, with only minor relief from the heat expected Monday.