"It was a small fire but it had a powerful punch to it", Santa County Fire spokesman Mike Eliason said.
It was only 5 percent contained by Saturday, and had destroyed 20 buildings, according to the Associated Press.
Siskiyou County Board of Supervisors chair Ray Haupt says the blaze moved so fast it quickly reached Hornbrook, a community of about 250 people about 14 miles (22 kilometers) south of the OR border.
"Temperatures at 8 a.m. were ridiculously over 100 degrees" in foothills near Forest Falls and many inland valleys, the National Weather Service said.
OR authorities urged hikers and other outdoor enthusiasts to avoid forests near the state line. The blaze was 48% contained by Saturday morning, but had already burned 10 structures, according to Cal Fire.
East Iron Gate Reservoir Estates in areas south of the reservoir, Copco Road, north of Ager and Beswick roads, west of Desavato Road and east of Snackenbury Creek. Grass is considered one-hour fuel, meaning it can dry out in just one hour and be ready to help flames spread.
Other major fires in the state are close to being fully contained. The fire quickly grew to about 1.5 square miles. In 2015 in Chelan County, three firefighters were killed and another was injured fighting a wildfire in Twisp.
In the same county, a fire on the Camp Pendleton Marine base prompted the evacuation of 750 homes. That fire has scorched about 85 square miles (220 square kilometers) and is 50 percent contained.
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A dozen wildfires are burning in Colorado's forests, displacing families across the state.
Residents should be aware of low air quality as they return home and of some flames and smoke visible within the fire perimeter. Gov. John Hickenlooper visited the area Friday.
A wildfire burning through drought-stricken timber and brush near California's border with OR has killed one person and destroyed multiple structures as it grows largely out of control, authorities said Friday.
It also offered relief in the southern Colorado mountains where a blaze has destroyed over 130 homes and forced the evacuation of at least 2,000 properties.
Jennifer Jones is a spokesperson with the National Interagency Fire Center in Boise.
The blaze consumed an estimated 20 structures, including homes and other types of buildings.
Officials have opened up the burned-out area near a popular fishing lake 80 miles (130 kilometers) southeast of Salt Lake City, as well as a stretch of highway.
Highway 12 is closed from mm 7 to mm 22.5. Officials believe human activity sparked the blaze, but an exact cause hasn't been determined.