Thursday, Dec. 7, from 10 p.m. until 4 a.m. the morning of Friday, Dec. 8
MARIN COUNTY — The Marin-Sonoma Narrows B-7 construction project continues in December with guard rail repairs, which require ramp and lane closures on Northbound US-101 near Novato.
The San Antonio Road off-ramp on Northbound US-101 is scheduled to be closed Thursday, Dec. 7 from 10 p.m. until 4 a.m. on Friday, Dec. 8.
Lane closures on Northbound US-101 will be required during the construction hours. At least one lane will be open for traffic.
Daytime access near San Antonio Road will be available for drivers. All work depends on the weather.
Detour for San Antonio off-ramp closure
- Drivers can exit at Petaluma Boulevard/South Kastania Road on Northbound US-101 to reach their destinations.
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.
Construction 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.
On June 10, 2023, Caltrans diverted Southbound US-101 traffic onto new elevated lanes spanning San Antonio Creek to just north of Atherton Avenue in Novato. This was a major milestone for the project.
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 24/7 traffic updates, follow 511.org: https://twitter.com/511SFBay
For real-time traffic, click on Caltrans QuickMap: http://quickmap.dot.ca.gov/
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