Officials have publicly worried that many areas between Redding and Riverside County are at risk of mudslides and flooding after wildfires stripped the land bare.
Northeast of Los Angeles, State Route 2 is closed in both directions between the Vincent Gulch Divide and State Route 39, in the Angeles National Forest, because of a rock slide, Caltrans said.
Snow, meanwhile, closed a portion of Interstate 5 in the Grapevine and Lebec areas — between Los Angeles and Bakersfield — after vehicles began sliding across the roadways.
“Caltrans #snowplows are hard at work on I-5 through the Grapevine,” the department tweeted.
To the south, I-5 is also closed at its intersection with State Route 170 in Pacoima because of flooding.
In Tujunga, just north of Burbank, where a Southwest flight skidded off the runway in heavy rain Thursday, a portion of La Tuna Canyon is closed near Interstate 210 due to what officials described as 2-inch debris flow from a mudslide.
Burbank Boulevard is also closed near its intersection with Interstate 405 in Sherman Oaks because of flooding in the Sepulveda Basin, Caltrans said.