Authorities said PCH was shut down from Las Posas Road in Camarillo to Trancas Canyon Road in Malibu shortly before noon. That closure was later expanded to cover Broad Beach to Las Posas due to significant mud flow.
Crews worked to clear the mess and the road was reopened in both directions by around 4 p.m.
"Please drive with caution," Caltrans warned motorists.
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A similar part of the highway was inundated with mud the last time a small storm cell hit the region, causing vehicles to get stuck in the muck.