Fairfax-Bolinas Road CONDITION UPDATES, thank you for your patience: Fairfax-Bolinas Road is closed from Azalea Hill to Ridgecrest on weekdays, but is open on weekends with the single lane access at milepost 5.73. By the end of January (weather permitting), the project is expected to be completed and the roadway will fully reopen. See project webpage for details.

Bellam Boulevard Off-Ramp Improvement (TAM project)

Description

This is a Transportation Authority of Marin (TAM) project. At the request of TAM, the County of Marin is managing the construction effort of the project.

Overview

The Transportation Authority of Marin (TAM) project includes adding a second lane to the off-ramp of Bellam Boulevard from US 101, separating the traffic turning left onto Bellam Boulevard from the traffic turning right or continuing straight across the intersection to the eastbound I-580 on-ramp, widening the I-580 on-ramp in order to receive the shifted through lane. Additional improvements generally include concrete barrier, traffic signal modification, storm drain improvements, pavement markings/striping and a new retaining wall.

This project is intended to mitigate the traffic congestion on northbound US-101 and eastbound I-580 at the Bellam Boulevard off-ramp in San Rafael.

Funding

TAM's total project cost is estimated at $9.2 million, funded by Transportation Sales Tax (Measures A and AA) and California Transportation Commission.

Traffic impacts

For the preparation work, which will include clearing, grubbing, and tree removal for the areas that will subsequently be used to accommodate the widened ramp/roadway, it is unlikely that there will be any significant traffic impacts. The work will require closure of the roadway's shoulder. There is the possibility of some nighttime (midnight to 5:00AM) lane closures, if necessary, to accurate more intensive equipment maneuvers and operations.

Traffic impacts are TBD for the construction phase of the project. That information will be provided closer to the construction phase start date.

Timeline

May 2024

  • County of Marin Board of Supervisors authorized a Cooperative Agreement with TAM for the County to advertise, award, and administer the construction contract on behalf of TAM.

Early-January 2025

  • Preparations at construction site expected to begin. This may include activities such as clearing, grubbing and tree removal.
    • Crews will first conduct tree removal along the right side of the off-ramp from US 101 to Bellam Boulevard and then move to working along the right side of the on-ramp to I-580 from Bellam Boulevard.
    • Tree removal is required to provide space for the off-ramp widening and associated retaining walls.

End of January

    • Preparations at construction site expected to be completed.

Spring 2025

  • Expected start of construction phase

Late Fall 2025

  • Anticipated completion of the construction phase
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