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Night Work for Ramp, Lane Closures on Southbound US-101 as Marin-Sonoma Narrows B-7 Project Continues in Marin County

Published:

Schedule: Monday, Aug. 4 through Friday, Aug. 8 from 8 p.m. to 5 a.m.

Marin County — The Marin-Sonoma Narrows B-7 construction project continues in August with paving operations, which requires ramp closures on Southbound US-101 in Novato.

Lanes are scheduled to be closed on Southbound US-101 from Monday, Aug. 4 through Friday, Aug. 8 from 8 p.m. until 5 a.m. the next mornings. At least one lane will be open for traffic.

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.

The Atherton Avenue and De Long Avenue on- and off-ramps on Southbound US-101 are scheduled to be closed from Wednesday, Aug. 6 to Friday, Aug. 8 during that same time frame.

All work depends on weather. Daytime access will be available for drivers.

The Marin Sonoma Narrows B-7 project is scheduled to open all HOV lanes by late August, early September.

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

  • Drivers should travel Southbound on Redwood Boulevard and enter Southbound US-101 at Rowland Boulevard.

Detour for Atherton off-ramp closure on Southbound US-101

  • Drivers should exit at Rowland Boulevard, turn right and use Redwood Boulevard to reach their destinations.

Detour for De Long Avenue on-ramp on Southbound US-101

  • Drivers should take Redwood Boulevard from De Long Avenue and enter Southbound US-101 at Rowland Boulevard.

Detour for De Long off-ramp closure on Southbound US-101

  • Drivers should exit at Rowland Boulevard and then use Redwood Boulevard to reach De Long Avenue.

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

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.

For more information about new uniform HOV lane hours, see bit.ly/3HoVfOO

Please drive with caution. Slow for the Cone Zone and Be Work Zone Alert.

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.