SR 131 Capital Preventive Maintenance

Contact: Matt O’Donnell
Phone: (510) 852-5113

Map showing State Route 131 in Tiburon.MARIN COUNTY – Caltrans District 4 (Bay Area) is in the environmental phase of the State Route 131 (SR-131) Capital Preventive Maintenance Project in the town of Tiburon.

The purpose of the project is to improve serviceability and ride quality on SR-131 and restore existing drainage systems to reduce the potential for highway flooding and to increase the safety for the public.

In addition, the project will enhance and complete streets and support active modes of transportation by bridging a gap in the transportation network and improve bicycle access throughout the area.

The location is approximately 1,000 feet west of US-101 interchange to the Tiburon Boulevard/Main Street intersection.

The Draft Environmental Document (DED) for the project was released and Caltrans held a public comment period from Sept. 29 through Nov. 3, 2023. The link to the DED can be found here:

The final environmental document was released in January of 2024.
The final design phase is scheduled for the summer of 2025.
Construction is set to begin in the winter of 2026.
The project is scheduled to be completed in the winter of 2027.

Projected total cost: $19.7 million