Pacific Coast Highway reopened in both directions from Trancas Canyon and Broad Beach roads in Malibu to Las Posas Road at the Ventura County line Monday following cleanup of debris pushed onto the road by heavy rain.
Ventura County sheriff's officials announced the reopening at about 4:20 p.m., just as evening rush hour traffic was also beginning to flood streets.
Earlier, mudflow and storm runoff had "covered lanes," and only residents with an ID were allowed to pass.
Highway 23, or Decker Road, remains closed in both directions from PCH to upper Mulholland Highway Drive.
About 1:50 p.m., authorities announced an additional closure of West Broad Beach Road for westbound traffic. The Los Angeles County Sheriff's Department was on scene and will allow residents to enter.
The area was affected by the destructive Woolsey Fire, which burned in Los Angeles and Ventura counties last year.