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.

Bolinas Road Slide Repair at milepost 1.0



The March 2023 storms triggered multiple landslides and roadway damage along Bolinas Road. The damaged locations have been receiving repairs in order of urgency. The road is the sole route for hundreds of homes and provides critical access for wildland firefighting. The road is also the only way to reach water treatment facilities that supply drinking water for one-third of Marin Water’s customers, approximately 90,000 residents.

The slide repair project at milepost 1.0 will entail building a 175-foot-long retaining wall at that location, as well as reinforcing the existing adjacent retaining wall with new anchors.


The construction cost is estimated at $2.4 million and 88% would be covered by a Federal Highway Administration (FHWA) grant.

Traffic impacts

Construction work hours are planned for weekdays from 8 a.m. to 6 p.m. with traffic control measures in place. For the duration of the project, traffic would flow through a single lane with alternating two-way traffic. Weekend work may be permitted as necessary and would be announced in advance to minimize inconvenience to travelers. Drivers and cyclists are required by law to adhere to all roadway laws, which include following the construction signage and traffic control measures. Traffic delays will be limited to no more than seven minutes. Some construction activities are expected to require short road closures of approximately four-hour intervals, which will be publicized in advance.


August 2024

  • Expected start of construction phase

Fall 2024

  • Anticipated completion of the construction phase
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