Footage captured boulders and other flaming debris falling down onto the road.
An emergency dispatcher recorded the video on his dashcam while driving along the mountainside.
RELATED: El Dorado Fire near Yucaipa sparked by pyrotechnic device at gender reveal party, officials say
Officials said the blaze, which was caused by a smoke-generating pyrotechnic device used during a gender reveal party, has grown to 22,489 acres and is 59% contained.
Investigators say the people who started the fire, which erupted Sept. 5 near Yucaipa, could face charges related to death of a firefighter who was killed while battling the blaze.
RELATED: El Dorado Fire: Charges possible in death of firefighter killed while battling blaze in San Bernardino National Forest
The U.S. Forest Service said the death happened Thursday but did not release additional details.
The cause of the fire and the fighter's death are both under investigation.