"Sir Francis Drake Blvd is closed between Platform Bridge Rd and the entrance to Samual P Taylor State Park due to a large tree down. Marin County Fire Department crews are working to cut up the tree but it will likely take at least an hour. Use alternate routes. Update: @marin county department Marin County Public Works is on scene and estimating the road will be closed until 10AM. Use an alternate route." - CHPMarin (thx LP and BE)