Up to seven acres burned in Trione-Annadel State Park

Firefighters were expected to work through the night to douse a wildfire that burned up to 7 acres in Trione-Annadel State Park on Sunday afternoon, Cal Fire officials said.

Fire crews had stopped the advance of the blaze but were still working to build containment lines around the burn area by Sunday evening, an agency spokeswoman said.

The fire erupted around 1:44 p.m. in heavy brush and oak woodland in rugged, hard-to-reach terrain near Lake Ilsanjo, located in the center of the 5,000-acre park, Cal Fire personnel said.

Firefighters had to hike into the fire, delaying their response, although they made fast progress in stopping the fire’s progress.

Up to 148 firefighters were assigned to the blaze, aided by three air tankers and two helicopters, Cal Fire said.

Crews attacked the Annadel incident even as firefighting resources around the region were scrambling to address a much larger blaze atop the The Geysers outside Cloverdale, which had reached 1,500 acres by afternoon.

The Annadel blaze remained within the park, and no structures were threatened, Cal Fire said.

You can reach Staff Writer Mary Callahan at 707-521-5249 or mary.callahan@pressdemocrat.com. On Twitter @MaryCallahanB.