Two wildfires make up the Mendocino Complex. The Ranch Fire which was 23 percent contained and the River Fire which was 58 percent contained on Sunday.
The fires burned in Mendocino, Lake and Colusa counties, about 90 miles north of San Francisco.
The Mendocino Complex fires cover more than two-thirds the size of sprawling Los Angeles. They have forced the evacuation of more than 20,000 residents and destroyed more than 100 structures.
So far this year, US fires have burned 5 million acres, much more than the 10-year average, according to the National Interagency Fire Center.