Firefighters on Saturday contained a 55-acre fire along Interstate 580 at Grant Line Road on the Altamont Pass, the Alameda County Fire Department reported Saturday morning.
Fire officials at one point reported the blaze at 75 acres but said better mapping accounted for the updated acreage.
At least one westbound lane of I-580 was closed due to the fire. The California Highway Patrol was advising motorists on that side of the Altamont to proceed with caution.
The CHP also said it is investigating several fires over an 8-mile stretch in the area as possible arson incidents.
Anyone with information should call CHP Dublin at (707) 641-8300.
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