MENDOCINO COUNTY (CBS SF) — Cal Fire crews are working to contain a vegetation fire in Mendocino County that has burned over 85 acres, triggering evacuation orders on Monday.

Dubbed the “Moose Fire,” the blaze began burning off Moose Road and Bus McGall Road northwest of Hopland in Mendocino County.

The fire has a moderate rate of spread and is burning in a brush and grass oak woodland area with steep terrain, Cal Fire said. Ten structures are currently being threatened.

Evacuation orders were in effect for residents of Valley View Drive in addition to the Bus McGall and Moose Road areas, according to the Mendocino County Sheriff’s Office. Residents are advised to evacuate the area immediately and head towards a safe location. The north end of Feliz Creek is also under an evacuation warning.

The fire burned 85 acres as of 8:30 p.m. Monday evening and was 25% contained, Cal Fire said. The cause of the fire is under investigation. About 300 firefighters are battling the fire, with more personnel arriving throughout the night.

The Sonoma County Sheriff’s Office sent out an advisory stating there were no active fires in the area after reports of smoke smell from residents in the area of Cloverdale all the way down to the Mark West Springs Road area.

This is a developing story. Stay with CBS SF for the latest updates.