The Magpie Rock Fire burning eight miles west of Dixon has doubled in size since Wednesday and has now scorched an estimated 2,500 acres.
There are now 287 people assigned to the lightning-caused fire which is burning in steep, rocky terrain with dense brush and timber.
Fire managers report seeing "very extreme" fire behavior on Wednesday as the blaze continued to move east and southeast towards Revais Creek.
Heavy Air Tankers dropped retardant on the fire, along with other aircraft. Additionally, a burnout operation was successful on the northeast flank.
There are no evacuations and no structures threatened at this time. The blaze remains 0% contained.
There are area road closures in place.
