Night Work for Ramp Closure on Northbound US 101 as Marin Sonoma Narrows B 7 Project Continues in Marin County

Published: Oct 16, 2024

Schedule: Wednesday, Oct. 16 from 7 p.m. to midnight

Marin County - The Marin-Sonoma Narrows B-7 construction project continues in October with underground drainage system replacement, which requires a ramp closure on Northbound US-101 near Novato.

The San Antonio Road on-ramp on Northbound US-101 is scheduled to close on Wednesday, Oct. 16 from 7 p.m. until about midnight.

All work depends on weather. Daytime access will be available for drivers.

• San Antonio on-ramp closure: Drivers should take Southbound US-101 to Atherton Avenue and take the Atherton Avenue on-ramp to get back on Northbound US-101.

This project hit another milestone on Aug. 30, 2024, when the deck of Southbound Franklin Avenue Overhead was poured as this was the last of the deck pours for the project. That bridge widening is the last bridge structure that will be widened as part of the Marin-Sonoma Narrows program.

Construction for the project includes widening US-101 to install HOV lanes for 3.5 miles along the northbound lanes from North Novato to the Marin, Sonoma line, and for 6.3 miles along the southbound lanes from De Long Avenue to the county line.

This is the last remaining High Occupancy Vehicle (HOV) lane construction project as part of the 16-mile US-101 Marin-Sonoma Narrows (MSN) program. This project will complete and allow continuous HOV lanes on US-101 from Sausalito in Marin County to Windsor in Sonoma County. HOV lanes are scheduled to be open to use in the summer of 2025.

Please drive with caution. Slow for the Cone Zone and Be Work Zone Alert. Caltrans thanks motorists for their patience while we work to maintain our state's highways, bridges, and tunnels.

For real-time traffic, click on Caltrans QuickMap: https://quickmap.dot.ca.gov/
For 24/7 traffic updates, follow 511.org: https://511.org/

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