Northbound lanes of the 5 Freeway were shut down at Lake Hughes Road. Two northbound lanes were opened before 9 p.m. Friday and traffic was beginning to move.
At 1:30 p.m., the blaze had charred 3 to 5 acres. By 3 p.m. the fire had increased to more than 50 acres. By 4:15 p.m. the fire had grown to 150 acres.
By 5:45 p.m. the fire had grown to 500 acres. It was reportedly 10 percent contained.
At 8:10 p.m. the fire had grown to 650 acres.
Fire officials said flames were running uphill and they were fighting it from the air.
A total of six helicopters and three fixed-wing tankers were battling the blaze, along with 250 firefighters on the ground.
No structures were threatened. No injuries were reported.
The cause of the fire was not immediately known.
