Mandatory evacuations are underway for people living in the Riviera West area.
The fire broke out this afternoon and it's burned for several hours, in a steep, heavily wooded area. Cal Fire has been attacking from both the ground and from the air.
So far, flames have burned at least 19 acres, 30-percent contained, and there are reports it might be two different fires burning near one another.
Stay with ABC7 News for updates on this developing story.