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Yearlong Tiburon Boulevard work to add bike lanes – & fiber optic?

Caltrans is planning a Tiburon Boulevard revitalization project in mid 2025 that will include new bike lanes. Class-4 bikeways (red), are on the roadway but separated from vehicle traffic and would span most of the stretch from Tower Road in Mill Valley (at left) through Jefferson Drive in Tiburon. On the south side of the boulevard, the bikeway will connect to the Old Rail Trail at Blackie’s Pasture. Also on the south side, one stretch providing access between the Bel Aire neighborhood and the Strawberry Recreation District will be a class-1 bike path (purple), which is entirely off street. (Kevin Hessel / The Ark; Apple Maps)

Caltrans is seeking feedback on a planned yearlong project to add new bike lanes, improve flooding control and potentially allow the town to install a fiber optic cable along Tiburon Boulevard.

The $19.7 million repaving project, estimated to begin in June 2025, would span the entirety of the 4.5-mile thoroughfare, from the east end of East Blithedale Avenue near Tower Drive, just outside of Mill Valley city limits, all the way down Tiburon Boulevard to the intersection with Main Street.

According to Caltrans, which is responsible for maintaining the highway also known as also known as State Route 131, the work would take up a full construction season — 220 working days, or about 10 months.

Caltrans will host a virtual meeting from 6 to 7:30 p.m. Oct. 26 that will feature a presentation on the project, followed by a question-and-answer session, and members of the public can submit comments on the project’s environmental impacts through Nov. 3.

• Caltrans’ dedicated website for the Tiburon Boulevard project is at To review the environmental documents, visit

• To attend the online meeting, from 6 to 7:30 p.m. Oct. 26, use the Zoom app with meeting ID 929-3878-4331.

• To submit public comment, due by Nov. 3, visit the project website, email or mail Caltrans District 4 Office of Environmental Analysis, ATTN: Maxwell Lammert, Acting Office Chief, P.O. Box 23660, MS-8B, Oakland, CA 94623-0660.



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