WILLIAMS, Calif. (AP) — Firefighters are hoping to overtake a pair of growing wildfires in Northern California that is threatening 23 homes.

State fire spokeswoman Stacie McCambridge said Friday that more than 1,200 firefighters are battling the blazes in Colusa County known as the Sixteen Complex Fire which has grown to more than 19 square miles.

McCambridge says the fire is currently 20 percent contained as crews are working aggressively to establish containment lines in steep and rugged terrain through grass, brush and oak woodland.

Officials say smoke will be highly visible as an evacuation advisory is in effect for the Cortina Rancheria area near Highways 16 and 20. A stretch of roadway from Highway 20 to the town of Rumsey also remains closed.

Officials hope to have the fire fully contained by Monday.

Copyright 2012 The Associated Press.