On weekdays, Fairfax-Bolinas Road in West Marin is closed from Azalea Hill to Ridgecrest. On weekends, the road will be open, but traffic will be routed through a single-lane with controlled two-way access at milepost 5.73. See project webpage for details. Thank you for your patience while these projects progress.

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

TBD. The 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.

January 2025

  • Preparations at construction site expected to begin.

Spring 2025

  • Expected start of construction phase

Fall 2025

  • Anticipated completion of the construction phase
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