Los Angeles County firefighters were able to assist approximately 50 people in leaving the campground.
"We had some campers that were trapped, unable to make it higher ground, due to fast-moving water," said Los Angeles County Fire Department Capt. Ron Haralson. "Their vehicles were flooded up to the doors. We were able to assist/rescue 27 people to safety."
The fire crews were working on a plan to get them out of the area. Ventura County firefighters were assisting L.A. County crews.
David Saul, the owner of Malibu Emergency Preparedness Solutions, captured a video of the rushing water.
Fire crews said there were about 20 trailers at the campsite as of Thursday morning.
No injuries were reported.
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