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SR 131 Capital Preventive Maintenance

SR-131 Capital Preventive Maintenance Project map. Phase 1 includes pavement repair from US-101 interchange to the Tiburon Boulevard/Main Street intersection, bikeways along SR-131 from Tower Drive near the US-101 interchange to Blackfield Drive, and introduces a temporary two-way Class I bike path on the inbound side of SR-131, from Strawberry Drive to Blackfield Drive.

Project Overview

Caltrans District 4 (Bay Area) reached 100 percent design in the State Route 131 (SR-131) in the Capital Preventive Maintenance Project in the town of Tiburon. Phase 1 is scheduled to go into construction in mid- to late-summer of 2026.

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.

Caltrans proposes to repair approximately 4.6 miles of East Blithedale Avenue/Tiburon Boulevard from approximately 1,000 feet west of the U.S.-101 interchange extending east to the Tiburon Boulevard/Main Street intersection during Phase 1.

The integration of Complete Streets elements also remains a key priority for Caltrans, especially as the agency works to meet critical deadlines to move the project forward.

Phase 1 includes bikeways along SR-131 from Tower Drive, near the US-101 interchange, to Blackfield Drive, and introduces a temporary two-way Class I bike path on the inbound side of SR-131, extending from Strawberry Drive to Blackfield Drive.

Phase 2 will implement the permanent configuration of the Class I path, which includes reconstruction of the landscaped median. It also will include bikeways from Blackfield Drive to Trestle Glen Boulevard, along with bus stop improvements. Phase 2 will involve heavy engagement from stakeholders before moving forward.

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: https://bit.ly/3FoHdsj

Project Schedule for Phase 1 of SR-131 CAPM project

The final environmental document was released in January of 2024.
The final design phase was complete in early 2026.
Construction is targeted to begin in the mid- to late-summer 2026.
The project is scheduled to be completed in the winter of 2027.

Project Contact

Matt O’Donnell
Marin County Public Information Officer
Email: matt.odonnell@dot.ca.gov
Phone: (510) 852-5113