The 16 Complex Fire in the remote Rumsey Canyon area of Colusa County burned almost 18,000 acres by Saturday evening and was reported 71 percent contained, officials said.
The complex consists of two areas burning about four miles apart along Highway 16 south of Highway 20. The fire began Tuesday.
The California Department of Forestry and Fire Protection lifted an evacuation order at 5 p.m. Saturday for residents of the Cortina Rancheria area.
Highway 16, which was closed from Highway 20 to the town of Rumsey, also was reopened Saturday, Cal Fire spokesman Daniel Berlant said. But officials said traffic could be restricted or closed on Highway 20 if the fire approaches.
Fire officials said efforts were being made to protect structures and cultural values in the rancheria and fire area. They said 23 residences, one commercial structure and seven outbuildings are threatened.
Meanwhile, another fire that was reported Friday in neighboring Lake County burned 3,000 acres by Saturday evening. The fire, which threatened 300 residences and 40 outbuildings, was 5 percent contained Saturday, Berlant said.
Officials said the Scotts Fire was burning west of Scott Valley Road, on Cow Mountain, eight miles east of Ukiah. Mandatory evacuation orders for the Blue Lakes area were lifted Saturday evening.