Update: 5:30 p.m.
The Tower Fire along the Cuesta Grade was 100 percent contained Saturday night, according to Cal Fire San Luis Obispo County. It had burned 60 acres when crews stopped its progress earlier in the day.
One engine will remain on scene overnight.
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The Tower Fire along the Cuesta Grade remained at 60 acres overnight and is now 60 percent contained.
The slow northbound lane of Highway 101 remained closed to traffic Saturday morning while about 100 firefighters worked to keep the fire in check.
The fire, which began when a car fire ignited roadside vegetation, spread into steep, densely vegetated terrain, making the work slow, said Cal Fire San Luis Obispo County spokesman Chris Elms.
“It’s heavy timber so there’s going to be a lot of mop-up work,” he said.
“We’re taking the opportunity this morning to hit this thing hard and get as much containment as we can,” Elms said, adding that Cal Fire likely would be on the scene throughout the day.
The exact cause of the car fire remains under investigation, Elms said.
The car was the only property destroyed by the fire, he said, adding that reports of a downed power line were incorrect.