Marin City Noise Analysis (TAM and County project)

Description

This project is a partnership between the Transportation Authority of Marin (TAM) and the County of Marin.

Overview

The Transportation Authority of Marin (TAM) in cooperation with the County of Marin is conducting the Marin City Noise Analysis Project Initiation Document (MCNA-PID / Marin City Noise Analysis) to respond to resident concerns about noise from US-101. This is a collaborative effort with the California Department of Transportation (Caltrans) to assess sound impacts from Highway 101 and the possibility of alleviation options for Marin City. Conducting a comprehensive study and analysis of this nature is necessary before any potential infrastructure project can be considered.

In separate Board meetings in April and May 2025, TAM and the County of Marin approved to move forward with the Marin City Noise Analysis. During the estimated 15-month study and report development process, TAM and the County will communicate progress to interested parities and the community of Marin City.

The Marin City Noise Analysis is expected to include the following elements:

  • Measure existing noise levels at representative receptor locations
  • Model the noise levels using FHWA Traffic Noise Model to predict existing noise levels within the study limits
  • Identify noise impacts and recommend potential noise abatement measures. In order to warrant noise abatement measures, for example a soundwall or a berm, the noise impacts must meet specific criteria. This work will determine what measures would be appropriate.

Funding

The estimated $700,000 project is being funded by TAM (50%) and the County of Marin (50%).

Public impacts

The noise analysis study and development of the report will not impact public access.

Timeline

All dates are tentative and subject to change.

Ongoing

  • Public communications and meetings with interested parties and community members will be determined once the project is initiated and based on study milestones.
  • This website will be updated with project meetings and opportunities for input.

Summer 2025

  • Initiate the study with the contractor
  • Conduct a sound/noise study within the community along the US-101 corridor where noise impacts are a concern.

Late 2025 / Early 2026

  • Expected completion of the draft Noise Study Report
  • Present Noise Study Report to Caltrans

TBD Mid/Late 2026

  • Expected completion of Project Initiation Document (PID).

Timing of public communications and potential meetings with interested parties will be determined based on study milestones. Please check this webpage regularly to stay up to date.  

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