UPDATE (Oct. 25, 4:15 a.m.): Evacuation orders were lifted for those affected by the Old Water Fire in San Bernardino.
Stretches of Highway 18 that were shut down during the firefighting effort were also reopened for traffic.
As of early Friday morning, the fire has burned 105 acres and is 30% contained.
All updates on this fire are being posted on this page .
(KGTV) -- A wildfire that erupted in San Bernardino early Thursday morning prompted mandatory evacuations and shut down numerous roads.
The blaze, dubbed the Old Water Fire, was first reported at around 2 a.m. and broke out near Old Waterman Canyon Road and Highway 18, officials with San Bernardino National Forest said.
Officials said the fire had a “potential for large growth” due to high Santa Ana winds.
As of 12 p.m., the fire burned at least 75 acres and was at 30% containment, according to San Bernardino County Fire District officials.
Mandatory evacuations were issued for at least 80 residences, with an evacuation center established at San Gorgonio High School. All voluntary evacuations have been lifted.
A stretch of Highway 18 was shut down between 40th Street in San Bernardino and Highway 138 in Crestline.
SBNF officials are posting updates, including road closures and evacuation orders, on this page .
The cause of the fire is unknown.