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

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

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Schedule: Tuesday, Jan. 6 through Friday, Jan. 9 from 9:30 p.m. until 6 a.m.

Map location of the Atherton Avenue on- and off-ramps to be closed on Southbound US-101 for the Marin-Sonoma Narrows B-7 Project.

Marin County — Caltrans has scheduled ramp and lane closures for electrical work on Southbound US-101 for the Marin Sonoma Narrows B7 project from Tuesday, Jan. 6 through Friday, Jan. 9 from 9:30 p.m. until 6 a.m. the next mornings.

The Atherton Avenue on-ramp on Southbound US-101 is scheduled to be closed during that time frame.

Work is weather dependent.

Detour for Atherton Avenue on-ramp closure on US-101

  • Drivers should travel Southbound on Redwood Boulevard and enter US-101 at De Long Avenue.

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.

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.