The three-alarm blaze is comprised of multiple fires but forward progress was stopped at 8:30 p.m., according to fire officials.
California Highway Patrol officials, who first reported the fire at 7:13 p.m., said the highway is closed and traffic is being diverted to Franklin Canyon Road.
Lanes have been reopened but residual delays and traffic are becoming a problem. Fire officials have not yet determined the cause of the fire.
Stay with ABC7 News for the latest details on this developing story.