US-101 Marin Sonoma Narrows ProjectNorthbound Traffic Shift – Overnight June 21, 2019


06-21-2019-North Bound 101 MSN Traffic Shift

As part of the continued progress of US-101 Marin-Sonoma Narrows Project, Caltrans will shift northboundUS-101 traffic to a new traffic alignment south of San Antonio Creek for approximately ¾ of a mile. Traffic shift will begin overnight Friday, June 21 at 11:59 PM and will be completed Saturday, June 22, by 7:00 AM.

  • The speed limit in this construction area has been reduced.
  • Additional safety signage has been installed, as well as message boards to warn motorists of the lane shift.
  • Traffic shift is weather dependent.Please drive cautiously through the construction zone, leave a safe traveling distance between your vehicle and the vehicle ahead of you, and please #BeWorkZoneAlert.

Travel information is available on Caltrans QuickMap: and Follow us on Twitter: @CaltransD4 or @CaltransHQ