The Rocky fire burning in the rugged terrain of Lake County continued to expand Friday, consuming 18,000 acres by early afternoon, Cal Fire reported.
The latest report, issued shortly before 2:30 p.m., put containment at 5 percent.
The Rocky fire, near Morgan Valley Road and Rocky Creek Road, east of Lower Lake, began about 3:30 p.m. Wednesday and, pushed by strong winds, quickly devoured thousands of acres of heavy brush and timberland.
About 1,000 personnel and 150 fire engines were assigned Friday to the firefighting effort. Eight airplanes and eight helicopters were preparing to drop fire retardant and water on the blaze.
Three structures were destroyed. Crews worked throughout the night Thursday to take advantage of cooler temperatures.
Other fires burning in Northern California:
Swedes fire: The fire in Butte County started shortly before noon Wednesday. Cal Fire reports 400 acres have burned. Containment was at 60 percent by early Friday afternoon.
Lowell fire: The fire in Nevada County started Saturday. Total burned acreage stood at 2,303 acres with 75 percent containment.
Wragg fire: The fire in Napa and Solano counties near Lake Berryessa started July 22 and burned 8,051 acres. Containment was at 80 percent.