Tepusquet Road from Highway 166 to Santa Maria Mesa Road is closed. A total of 40 wildfires are now burning in 11 western states.
At least 750 homes remained threatened and hundreds more were evacuated. The fire south of Oroville was one of more than a dozen burning in the state as firefighters worked in scorching temperatures to. Its cause was unknown. On Saturday, a fire at an electrical power station in Los Angeles left 140,000 residents without power, after a second straight day marked by temperatures that exceeded 90 degrees (32 Celsius).
All campers and staff were safe, organizers said in a message posted on social media.
If smoke is not present where you live, you are advised to take that opportunity to air out your home.
The fire is believed to have started Saturday (July 8) around 1:45 p.m.More news: One dead, eight wounded after shooting at OH gender-reveal party
Sunday's temperatures will approach 95 degrees Fahrenheit, forecasters said, with little chance of rain. A warning was also issued for the residents of Buckhorn area.
The blaze about 60 miles north of Sacramento grew rapidly to more than seven square miles and was almost 20% contained, according to the California Department of Forestry and Fire Protection.
Both fires are suspicious as a bystander saw a vehicle speeding away from the area right after the fire started, said Zaniboni.More news: Trump and Xi at G20 in Hamburg: Time to abandon illusions
"This is very, very steep, rugged mountain terrain", said Ryan Diguilio, a Santa Barbara City Fire Department investigator.
Authorities have said that ground and air resources have been deployed to face this blaze's "extreme fire behavior".
The fire off state Route 166 near Twitchell Reservoir broke out about 3:45 p.m. and within a few hours had grown to 3,000 acres and was threatening remote homes, according to Cal Fire. The blaze was 10 percent contained.More news: Firefighters Battle Massive Fire at Construction Site in Oakland
Incident information from Cal Fire.