Northbound US-101, Northbound State Route 1 Connector Ramp Expected to Continue to be Affected by High Tides in Marin County

Ramp has been closing more than usual in fall 2026

Marin County - Caltrans maintenance will continue to close the Northbound US-101, Northbound State Route 1 (SR-1) connector ramp in Mill Valley when needed if high tides affect the roadway.

The lower half of the Manzanita Park and Ride lot will continue to be closed due to flooding. Shoulder parking on SR-1 could be affected during tide events as well.

Maintenance will open the roadway as soon as high tides subside.

On Thursday, Oct. 29, the ramp was affected from high tides from about 1 p.m. to 6:30 p.m. The ramp was affected again on Friday, Oct. 30 and Saturday, Oct. 31.

More high tides are expected in November in Marin County.

King tides are scheduled for the following time frames:

• Nov. 22-28, 2026
• Dec. 20-27, 2026
• Jan. 18-24, 2027
• Feb. 16-22, 2027

This area may flood at any time throughout the fall/winter due to higher tides and winter weather conditions.

For more about king tides, see https://www.coastal.ca.gov/kingtides/

For more on Marin County preparation for El Niño see: El Niño & Winter Storm Preparedness | ReadyMarin

For 24/7 traffic updates, follow 511.org: https://twitter.com/511SFBay
For real-time traffic, click on Caltrans QuickMap: http://quickmap.dot.ca.gov/

California Governor's Office of Emergency Services has shared this on El Niño:

How Californians can prepare for El Niño

El Niño does not guarantee a wet winter or any particular storm, but it heightens the risk of strong storms in California. Californians should prepare now for the possibility of heavy rain, snow, and flooding:

• Sign up for alerts. Get local emergency alerts here and follow trusted sources.
  
• Know your flood risk. Find out whether your home or workplace is in a flood-prone area or downslope of an area recently affected by wildfire, where heavy rain can increase the risk of flooding, debris flows, and mudslides.
  
• Stay informed. Pay attention to weather forecasts and sign up for emergency alerts from your city or county. Conditions can change quickly during major storms, so follow instructions from local emergency officials.
  
• Have an evacuation plan. Know where you would go and how you would get there if you need to leave quickly. Keep an emergency kit ready, including plans, medications, and supplies for pets and other animals.
  
• Never drive through floodwater. Water on flooded roads can be deeper and faster-moving than it appears, and roadways may be damaged or washed out beneath the water. Turn around and find another route. For flood-risk tips by region, a household checklist, and what to do after a storm, see Cal OES's Ready California El Niño preparedness guide.

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