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Second Culvert Project on US-101 in Marin City

Project Overview

Map location for the Second Culvert Project on US-101 in Marin County. The location is near Marin City from Donahue Street to 0.3 miles north of Donahue Street. Flooding affects the entire California Highway System, and Caltrans is looking for ways to mitigate the issue, especially with sea-level rise expected to affect the region in the next 100 years.

With the Second Culvert Project on US-101 in Marin County, Caltrans proposes to build a 6-by-4 culvert that will help mitigate flooding in the Marin City area. The location is near Marin City from Donahue Street to 0.3 miles north of Donahue Street.

The Draft Environmental Document (DED) is scheduled to be circulated externally in 2025. Caltrans hosted an informational meeting on the project on Wednesday, Nov. 20, 2024, from 5:30 p.m. to 7:30 p.m. at the Marin Community Service District Teen Center, 630 Drake Ave. in Marin City. A more formal meeting will be held in 2025.

The project team will inform the public about the purpose and need for the project, the proposed alternatives and feature public comments and outreach. There are four project alternatives being proposed.

Project Schedule

The project is scheduled to go into construction in 2027.

Caltrans is coordinating with Marin County and the Marin City Stormwater Task Force, which includes a county project, permanent pump station and floodwater within project limits.

Please send questions to marin_city_second_culvert_project@dot.ca.gov

Project Contact

Matt O’Donnell
Marin County Public Information Officer
Email: matt.odonnell@dot.ca.gov