Update: Southbound Highway 101 was reopened at 5 p.m., with northbound lanes expected to be opened by 8 p.m., according to Caltrans.
Parts of Highway 154 are closed until 5 p.m. on Sunday. Only residents will have access and through traffic should use Highway 101.
Original story: Santa Barbara County received the brunt of a Saturday morning storm that slammed into the Central Coast, with multiple trees fallen on structures, minor flooding and debris flows.
Highway 101 is closed from Milpas to Highway 150 for flooding, according to Santa Barbara CHP.
Mud and water covered the roadway near San Ysidro Creek and other areas, and both directions were still closed as of 11:30 a.m.
A flash flood warning was issued for the Sherpa and Whittier fire burn areas, and areas of Montecito, Summerland and Carpinteria were issued evacuation warnings Friday night.
Evacuation orders remained in effect Saturday for communities below the Thomas Fire, Whittier Fire and Sherpa Fire burn areas.
Heavy rainfall swept across the South Coast shortly after 8 a.m., with some rainfall rates above 0.5 inches per hour.
A large pine tree believed to be 100 years old came down on a Santa Barbara home, and a eucalyptus tree fell into an apartment complex in Goleta, the Santa Barbara County Fire Department reported.
Street flooding, downed trees and other problems were reported throughout the county, with numerous road closures and minor vehicle crashes.
Several Santa Barbara-area freeway underpasses were flooded, including Mission Street, Carrillo and Castillo streets, and officials shut down some Highway 101 exit ramps.
Union Pacific reported damage to the railroad tracks north of Ventura, which was delaying some Amtrak train traffic along the coast.
Creeks were flowing strongly, but no major debris flows had been reported as of 11:30 a.m.
In northern Santa Barbara County, several road closures, fallen trees and power lines were reported.
Fallen trees and toppled power lines completely blocked the lanes in the 2400 block of Highway 135 in Los Alamos.
The two-lane roadway was expected to remain closed between Bell Street and Harris Grade Road until early Saturday afternoon.
Rocks and mud were reported at multiple locations, including along Highway 101 at the Nojoqui Grade summit and on Highway 166 east of Santa Maria with crews working quickly to keep traffic flowing.
A number of large power outages also were reported in the Santa Maria, Los Alamos, Lompoc and Santa Ynez valleys related to the storm.