CHICO, California — A fire raging out of control in northern California has rapidly become among the biggest ever in the western US state, authorities said Saturday.

The so-called Park Fire burned more than 350,000 acres (142,000 hectares) as of Saturday evening, making it the seventh-largest ever recorded in California history, the state agency Cal Fire said.

The fire, which prompted orders for more than 4,000 people to flee their homes, was burning through a largely rural, mountainous area near the city of Chico, about 90 miles (145 kilometers) north of state capital Sacramento.

"Extreme fire conditions continue to challenge firefighters," Cal Fire said in a post on X.

The fire was just 10 percent controlled, despite the efforts of more than 3,700 personnel with over a dozen helicopters and several planes, according to an agency update.

Surrounded by flames, resident Grant Douglas takes a pause on the side of the while evacuating his wife and dog as the Park fire continues to burn near Paynes Creek in unincorporated Tehama County, California on July 26, 2024. AFP PHOTO Flames from the Park fire whip across highway 36 near Paynes Creek in unincorporated Tehama County, California on July 26, 2024. AFP PHOTO Fire engines drive through flames ripping across Highway 36 as the Park fire continues to burn near Paynes Creek in unincorporated Tehama County, California on July 26, 2024. AFP PHOTO An air tanker drops fire retardant on a ridge near the Paynes Creek area of unincorporated Tehama County, California, as the Park fire continues to burn on July 27, 2024. AFP PHOTO A property is seen in flames as the Park fire continues to burn near Paynes Creek in unincorporated Tehama County, California on July 26, 2024. AFP PHOTO

"Numerous firefighting air tankers from throughout the State are flying fire suppression missions as conditions allow," it said.

"Lower temperatures and higher humidity have reduced fire activity," the agency said, while adding that fire was still spreading.

The Park Fire started Wednesday near Chico, in Butte County, and within hours had devastated a wide area there and in neighboring Tehama County.

Cal Fire's latest update said 20 structures were confirmed destroyed by the fire, lowering an earlier estimate of 134.

The agency said the numbers were expected to fluctuate as officials assess the damage on the ground.

The blaze has generated an enormous column of dense gray smoke which has also been blown over nearby states.

On Thursday, police detained a 42-year-old man on suspicion of having started the fire by pushing a burning car into a ravine.

Chico is only about 15 miles from Paradise, a city devastated by a 2018 fire that ranked as California's most deadly ever, claiming 85 lives.

The explosive growth of the Park Fire has again placed Paradise under evacuation warning, unleashing painful memories for its residents.

Ava Elsner, who lived through the 2018 fire, told CNN she worries about her neighbors as the Park Fire blazes.

"I don't want anyone else to experience this. It's the most traumatizing, terrifying, and saddening thing to have a whole community go up in flames," she told the broadcaster.

Experts say climate change, accelerated by human action, is leading to more extreme weather events.

In Oregon, the Durkee Fire, which started earlier this month, has consumed nearly 290,000 acres and was about 50 percent contained, the state's wildfire response and recovery agency said.