In a photo provided by Caltrans, water and mud cover Interstate 5 at Fort Tejon, about 75 miles north of downtown Los Angeles, on Thursday, Oct. 15, 2015. Flash flooding sent water, mud and rocks rushing across Interstate 5, stranding hundreds of vehicles and closing the major north-south thoroughfare. (Caltrans via AP)
In a photo provided by Robert Rocha, cars on a road are stopped because of flooding, with some stuck in the mud in the distance, in Lake Hughes, Calif. Flash flooding sent water, mud and rocks rushing across Interstate 5 north of Los Angeles on Thursday, stranding hundreds of vehicles and closing the major north-south thoroughfare. A storm system brought downpours across a wide swath of northern Los Angeles County. A number of secondary roads were left impassable from mud and some residents were trapped in their homes. (Robert Rocha via AP)
Traffic is stopped on the northbound Interstate 5 just south of Hasley Canyon due to mudslides at Fort Tejon, Calif., Thursday, Oct. 15, 2015. (Katharine Lotze/Santa Clarita Valley Signal via AP) LOS ANGELES DAILY NEWS OUT; MANDATORY CREDIT
In this photo provided by Caltrans, vehicles are stopped in mud on California's Interstate-5 after flooding Thursday, Oct. 15, 2015. (Caltrans via AP)
Debris sits along Interstate 5 at Fort Tejon, about 75 miles north of downtown Los Angeles, on Thursday, Oct. 15, 2015. Flash flooding sent water, mud and rocks rushing across the interstate, stranding hundreds of vehicles and closing the major north-south thoroughfare. (Caltrans via AP)
Debris sits along Interstate 5 at Fort Tejon, about 75 miles north of downtown Los Angeles, on Thursday, Oct. 15, 2015. Flash flooding sent water, mud and rocks rushing across the interstate, stranding hundreds of vehicles and closing the major north-south thoroughfare. (Caltrans via AP)
Dark, muddy water rushes down the canyon under Lake Hughes Road north of Castaic Lake on Thursday, Oct. 15, 2015, after a heavy downpour caused a flash flood that washed out many sections of the canyon roads in the Angeles National Forest, and a section of northbound Interstate 5 near Fort Tejon, Calif. (Katharine Lotze/The Santa Clarita Valley Signal via AP) LOS ANGELES DAILY NEWS OUT; MANDATORY CREDIT