The Pass Fire began on Wednesday along Hams Pass Road in the Hulls Mountain Area northeast of Covelo.
On Friday Cal Fire said the fire was holding at 644 acres with 80 percent containment.
Cal Fire said 756 firefighting personnel were on scene Friday, with 37 engines, 30 of which were from Cal Fire, and 28 fire crews, of which 21 were Cal Fire's. There also was one dozer and eight water tenders.
Firefighting costs to date total $1.5 million.
Cooperating agencies include Cal Fire, Brooktrails Fire Department, Covelo Fire Department, Laytonville Fire Department, Little Lake Fire Department, Redwood Valley/Calpella Fire Department, Ukiah Valley Fire Protection District, US Forest Service and the California Department of Corrections and Rehabilitation. Mendocino National Forest was taking part in the unified command.
Cal Fire said the fire's cause remains under investigation.
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