Fairfax-Bolinas Road in West Marin at milepost 5.73 (approximately 2 miles west of Azalea Hill) is single-lane access with two-way traffic controlled through one lane. This condition is at the construction zone only and will remain in place until project is completed. See project webpage for more details. Thank you for your patience while this project progresses.

Marshall Petaluma Road MP 8.24 Erosion Repair



Storms caused an embankment failure immediately below the existing retaining wall on Marshall Petaluma Road at milepost 8.24, approximately half a mile south of Walker Creek Ranch. The County proposes to install a rip rap buttress along the slope starting from the bottom of the existing retaining wall to the slope of the creek, which is intended to stabilize the embankment and prevent future erosion.


The engineer’s estimate is $345,000 and will be funded through the Federal Highways Administration’s Emergency Relief Funds with a local match.

Traffic impacts

There will be one lane access with alternating two-way control through the single lane. Traffic delays will be limited to 5 minutes.


Summer 2024

  • Expected construction phase
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