Schedule: Monday July 6 through Friday July 10 from 8:30 p.m. to 6:30 a.m.
Marin County — Caltrans has scheduled ramp and lane closures for paving on Northbound and Southbound US-101 for the Marin Sonoma Narrows B7 project from Monday, July 6 through Friday, July 10 from 8:30 p.m. until 6:30 a.m. the next mornings.
The San Antonio Road on- and off-ramps are scheduled to be closed on Northbound US-101 during that time period.
Other ramps on Northbound and Southbound US-101 could be closed intermittently as well.
Detour for San Antonio Road on-ramp on Northbound US-101
- Drivers must enter on US-101 southbound at San Antonio Road, exit at the Atherton Avenue off-ramp and then re-enter US-101 northbound.
Detour for San Antonio Road off-ramp closure on Northbound US-101
- Drivers must exit at Petaluma Boulevard South/ Kastania Road, enter US-101 southbound, and exit at San Antonio Road.
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 three-lane configuration has completed and allows continuous HOV lanes on US-101 from Sausalito in Marin County to Windsor in Sonoma County.
All work is weather dependent.
For 24/7 traffic updates, please visit 511.org: https://x.com/511SFBay
For real-time information, visit Caltrans QuickMap: https://quickmap.dot.ca.gov
Follow us on X: https://x.com/CaltransD4
Or call 1-800-472-7623, 1-800-427-ROAD for state highway conditions statewide.
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