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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, July 14 through Friday, July 18 from 8 p.m. to 5 a.m.

Arial view map of the interchange between US 101 and Atherton Avenue in Marin County.

Marin County — The Marin-Sonoma Narrows B-7 construction project continues in July with pavement repairs and crack treatment for the existing roadway, which requires ramp and lane closures on Southbound US-101 in Novato.

The Atherton Avenue and De Long Avenue on- and off-ramps on Southbound US-101 are scheduled to be closed from Monday, July 14 to Friday, July 18 from 8 p.m. until 5 a.m. the next mornings.

As many as two lanes are scheduled to be closed in the area as well. At least one lane will be open for traffic.

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

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.

Arial view map of the interchange between US 101 and De Long Avenue in Marin County.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. HOV lanes are scheduled to be open to use in the summer of 2025.

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

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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