Marin County Quarterly Caltrans Update

Header image for the Marin County Quarterly Caltrans Update.

Welcome to the second Marin County Caltrans E-Newsletter!

Movie sequels are not always a superb idea, but we’re hoping that this sequel to the first Marin County Newsletter will be in the ballpark of "The Empire Strikes Back" and "The Godfather Part 2."

The goal of the newsletter is to provide quarterly updates on the county where you live, work, represent or serve. This newsletter will provide the status for some of the bigger projects and include other resources, content and data links to other information related to Caltrans' work in Marin County. As you might have noticed, the area is experiencing changes, and Caltrans wants to continue to evolve.

Marin County also is a community that is rich in outdoor activities, and a number of projects improve areas for cyclists as well as pedestrians. We know that vehicles still are essential, so HOV lanes will be essential for travelers on US 101 from Marin County to Sonoma County and back.


Visit our project website for additional updates.

For project questions & to sign up for our weekly newsletter, please contact us at EMAIL.

Marin Sonoma Narrows B-7 project reaches milestone

The Marin-Sonoma Narrows (MSN) B-7 project continues to progress throughout 2024, leading to High Occupancy Vehicle (HOV) lane completion scheduled for the summer of 2025.

The project reached another milestone on April 12, 2024, when traffic was shifted on US-101 in both directions from Novato near Olive Avenue to San Antonio Road.

Marin Sonoma Narrows B - 7 Project, Southbound traffic on US 101 from Novato near Olive Ave. to San Antonio Road.

Southbound traffic was realigned away from the temporary median lanes, into the newly constructed Southbound US-101 road section. That section has been raised to match the median that was opened in June 2023.

Marin Sonoma Narrows B - 7 Project, Northbound traffic on US 101 from Novato near Olive Ave. to San Antonio Road.

Northbound US-101 traffic was realigned into those same temporary median lanes now moving in the opposite direction, as the next phase of construction begins to reconstruct the old northbound road section.

Construction for the project includes widening US-101 to install HOV lanes for 3.5 miles along the northbound lanes from North Novato to the Marin, Sonoma line, and for 6.3 miles along the southbound lanes from De Long Avenue to the county line.

SR-1 Capital Maintenance Project about to begin

West Marin County is one of the most scenic areas in the whole state, and the Point Reyes, Olema and Tomales Bay areas of State Route 1 (SR-1) certainly qualify.

State Route 1 Capital Maintenance Project preliminary work on Shoreline Highway.

Preliminary work for the Capital Preventive Maintenance (CAPM) project is scheduled on Shoreline Highway the week of June 10, 2024. Preliminary work includes setting up area signs, placing message boards and mobilizing equipment.

State Route 1 Capital Maintenance Project will repair segments of SR 1 starting in the town of Tomales.

Once preliminary work has concluded, Caltrans will start its first segment in the town of Tomales the week of June 17. Work in the town of Point Reyes Station is scheduled for the end of July.

The $33.5 million project will repair segments of SR-1 and will include cycling and pedestrian upgrades. The project is slated to make improvements during a nearly 14-mile stretch from Olema through Point Reyes Station and from Tomales to the county line.

The upgrades include pavement resurfacing and repairs; restriping; culvert replacements to improve drainage; shoulder widening to help cyclists; guardrail, crosswalk, and signage upgrades; new signage; and sidewalk and path upgrades to meet disability access standards and improve access to West Marin-Inverness School in Point Reyes Station.

Caltrans met with representatives from the towns and public agencies in Tomales on May 2. The project team discussed details of the work, the schedule and communication goals.

For more information, see 1 Capital Preventive Maintenance

Sea-level rise project addressed in Marin County

Flooding affects many residential, commercial, and industrial land in Marin County, and Caltrans is looking for ways to mitigate the issue.

That’s why the agency held public informational meetings on the US-101, State Route 1 (SR-1) Sea-Level Rise project in Marin City on Thursday, Feb. 29 and in Tamalpais Valley on March 28.

Caltrans public informational meeting on US 101, State Route 1 Sea - Level Rise Project in Marin City February 29th.Both meetings were well attended, and the communities brought several excellent ideas to the table.

The purpose of the meetings was primarily as listening sessions for Caltrans as the project team fielded questions and comments. The project team also shared information about the Project Initiation Document (PID) stage.

Some of the goals are to learn from the community, share information and eventually receive funding, so the project can move on to the environmental stage. Public engagement will continue to be a priority throughout the project. Caltrans is scheduled to circulate the Draft Environmental Document (DED) externally in the summer of 2027.

With this project, Caltrans proposes to enhance access and mobility by addressing recurring flooding and sea-level rise impacts that affect SR-1, US-101 and the Manzanita Park and Ride lot in the Richardson Bay area.

For more info about the project, check out US-101, State Route 1 Sea-Level Rise Project

Current 2024 Marin County Maintenance Highlights Chart

The Marin County newsletter will be distributed on a quarterly schedule.

Caltrans bay area logoFor 24/7 traffic updates, please visit or
For real-time information, please visit Caltrans QuickMap:


Marin County Public Information Officers

Matt O’Donnell

Pedro Quintana

General Information
(510) 286-4444

Follow us for more! | Instagram | Twitter | Facebook | YouTube |