Schedule: Thursday, Oct. 24 and Friday, Oct. 25 from 9 p.m. to 6 p.m.
Marin County — The Marin-Sonoma Narrows B-7 construction project continues in October with retaining wall work, which requires a ramp closure on Northbound US-101 near Novato.
The San Antonio Road off-ramp on Northbound US-101 is scheduled to be closed on Thursday, Oct. 24 and Friday, Oct. 25 from 9 p.m. until 6 a.m. each night.
Detour for off-ramp closure on Northbound US-101
- Drivers should exit at Petaluma Boulevard South/Kastania Road, enter US-101 southbound, and exit at San Antonio Road.
All work depends on weather. Daytime access will be available for drivers.
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.
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