Comprised of mud, rocks and debris, the dramatic flood made its way across Sand Canyon Road near the Live Oak Campground in the Angeles National Forest.
The incident prompted a shutdown of the narrow two-lane street in both directions. Some motorists ignored the closure signs, hoping to avoid slow traffic on the nearby 14 Freeway during the rainstorm.
Gary Demaio, who lives in Sand Canyon, said he was not surprised by the mudslide but was somewhat worried about possible dangers to his home during amid heavy rainfall.
"We're at a 90-degree angle, the hill behind us," Demaio said. "The catch basin there is privately owned. It's a foot from the edge of the wall, so we're a little concerned about that."