About 4 feet of water and mud got inside during the storm, destroyed a backyard spa and gazebo, and entombed multiple cars in dirt and mud, including a Model T and a replica of Herbie the Love Bug, the Volkswagen Beatle from the Disney movies of the same moniker, the Antelope Valley Press reported.
Dunnagan told the newspaper she has flood insurance, but many of her neighbors weren't as fortunate.
"All of these guys have been told they have not been covered," she said.
Los Angeles County Supervisor Michael Antonovich said in a statement that he will ask the Board of Supervisors to approve declaring a local emergency for the communities in the Leona Valley, Quartz Hill and surrounding areas.
If approved as expected Tuesday, the emergency will free up state or federal resources to support recovery efforts.
The thunderstorms were powered by a low pressure system pulling in moisture from the south. As much as 1.45 inches of rain fell in a quick span of time near where the most intense flooding occurred.
The storms unleashed flash flooding and debris flows along State Route 58, Interstate 5 and throughout the area.
Those who witnessed the worst of the flooding describe it as terrifying.
"It was a raging river of mud," said 51-year-old Rhonda Flores, who was in her car when the flooding overtook State Route 58. "I've never experienced anything like it, ever."
She and hundreds of others on the roadway at the time were rescued about 10 hours later and spent the night at area shelters.
Sgt. Mario Lopez, a spokesman for the California Highway Patrol, said it will take days to reopen State Route 58, a mile of which is choked with mud between 2 and 6 feet deep. About 200 cars and semi-trucks were trapped in the now-hardened mud, frozen in place at odd angles.
Heavy equipment and workers were in the process of freeing the vehicles and clearing the mud Saturday.
Hundreds of cars also were stuck on Interstate 5, a major artery, but those cars were cleared and the freeway reopened by late Friday.
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Associated Press reporters Christine Armario, Sue Manning and John Rogers contributed to this report from Los Angeles, and Raquel Dillon contributed from Lake Hughes, Calif.