The Bald Fire in Lassen National Forest had grown to nearly 18,000 acres Saturday.
Homes in the Little Valley area of northwest Lassen County have been evacuated.
According to the Susanville Interagency Fire Center, there have been no structures damaged or destroyed.
The fire is burning in heavy brush and scattered timber on Bald Mountain near the Lassen-Shasta County line.
Containment is at 5%.
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