California Department of Transportation

07/03/2026 | Press release | Distributed by Public on 07/03/2026 12:05

Ramp, Lane Closures on Northbound, Southbound US-101 as Part of Marin Sonoma Narrows B7 Project in Marin County

Ramp, Lane Closures on Northbound, Southbound US-101 as Part of Marin Sonoma Narrows B7 Project in Marin County

Published: Jul 03, 2026

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.

| CleanCA.com | CleanWaterCA | #BeWorkZoneAlert | X | Facebook | YouTube |

###

California Department of Transportation published this content on July 03, 2026, and is solely responsible for the information contained herein. Distributed via Public Technologies (PUBT), unedited and unaltered, on July 03, 2026 at 18:05 UTC. If you believe the information included in the content is inaccurate or outdated and requires editing or removal, please contact us at [email protected]