The final acreage on Wednesday's Range fire west of Junction City was 1.5 acres, Cal Fire Battalion Chief Andy Reiling said.
The cause is under investigation, but the blaze which started less than 2 feet from Highway 299 is believed to have been sparked by a vehicle traveling through the area, he said.
In addition to Cal Fire, the U.S. Forest Service and Junction City and Weaverville volunteer fire departments responded to the fire. It was contained Wednesday night.
Update: The Shasta-Trinity National Forest reports firefighters quickly responded to the Range fire west of Junction City and have established a hose lay around the approximately half-acre perimeter.
Firefighters are responding to a reported vegetation fire about five miles west of Junction City, scanner traffic indicates. Rate of spread is described as slow to moderate.