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Highway 41 was closed from Highway 145 to road 200 due to the flames and smoke-- west of Millerton Lake.
The Madera County Sheriff's Office said the highway has re-opened.
The flames broke out at about 10:30 Thursday morning.
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HWY 41 closed at HWY 145 due to grass fires
Cal-Fire asked PG&E to de-energize a power line to assist firefighters. More than 300 customers were without power as a result.
The California Highway Patrol is investigating the cause but said the fire may have been sparked by a vehicle dragging a chain.