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

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

Published:

Schedule: Wednesday, March 26 until Friday, March 28 from 10 p.m. until 5 a.m.

Map of where night work for ramp and lane closures on Southbound US-101 for the Marin-Sonoma Narrows B-7 Project in Marin County.

Marin County — The Marin-Sonoma Narrows B-7 construction project continues in March with paving work preparation, which requires ramp and lane closures on Southbound US-101 in Novato. This work will lead to grinding down the existing pavement and replacing it with new asphalt.

The Atherton Avenue on-and off-ramps on Southbound US-101 are scheduled to be closed from Wednesday, March 26 until Friday, March 28 from 10 p.m. until 5 a.m. each day. The De Long Avenue on- and off-ramps are scheduled to be closed during the same time frame.

As many as two lanes are scheduled to be closed along Southbound US-101. At least one lane will be open for traffic.

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

Detour for on- and off-ramp closures for Atherton Avenue on Southbound US-101

  • On-ramp closure: Drivers should use Redwood Boulevard and enter Southbound US-101 at Rowland Boulevard.
  • Off-ramp closure: Drivers should use exit at Rowland Boulevard and use Redwood Boulevard.

Detour map of where night work for ramp and lane closures on Southbound US-101 for the Marin-Sonoma Narrows B-7 Project in Marin County.

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

  • On-ramp closure: Drivers should use Redwood Boulevard and enter Northbound US-101 at Rowland Boulevard.
  • Off-ramp closure: Drivers should take the off-ramp at Rowland and use Redwood Boulevard.

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, 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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