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.

Dillon Beach Road Retaining Wall

This is a completed project. You are in the Archived Projects section of the website. Active projects can be found on the Projects webpage.



A retaining wall is being constructed approximately 0.25 mile west of Elephant Rock on the north side of Dillon Beach Road to abate further ground movement and stabilize the ground below the roadway at this location.  A geotechnical assessment determined that the ground beneath the roadway was slowly sliding out and, if left unaddressed, would eventually result in full road closure. As this segment of Dillon Beach Road is the only route to the township, the County considers the new retaining wall a high priority.


The $570,000 project is funded by the County’s Road and Bridge Fund.

Traffic impacts

Construction will take place on weekdays and will require a lane closure for the duration of the project during daytime work hours. All traffic will flow through single-lane, alternating access controlled by flaggers or portable traffic signals, depending on the needs of the construction activities. Traffic delays will be kept as short as possible while still allowing crews to work safely. Some of the more intensive construction work, such as the drilling and positioning of the steel beams, will require longer traffic wait times of up to 20 minutes.


August 2021

  • Construction begins

October 2021

  • Retaining wall completed

November 2021

  • Sloping, erosion control, shoulder backing,  and guardrail work

December 2021

  • Project completed


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