Watch live: AIR7HD aerial coverage of flash flooding in Acton
The rushing water washed out the intersection at Red Rover Mine Road and Sierra Highway, and then overflowed onto the 14. Cars continued trying to cross over the growing stream and avoid being washed away.
A pickup truck was seen stuck in the rushing waters as rescue crews worked out a plan to save the driver.
Other cars were seen getting stuck in water at least 2-3 feet deep.
The backyards of some homes and fences were also overwhelmed by water.
DEVELOPING: We will provide more details as they become available.