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

Published: Aug 30, 2024

Schedule: Midnight on Wednesday, Sept. 4 through the morning of Saturday, Sept. 7

Marin County - The Marin-Sonoma Narrows B-7 construction project continues in September as crews are constructing a concrete barrier on the future outside shoulder on Southbound US-101 near Novato.

The Atherton Avenue on- and off-ramps on Southbound US-101 are scheduled to be closed at midnight on Wednesday, Sept. 4 until 6 a.m. the next morning.

The De Long off-ramp will be closed during the same time period.

The far right-lane on Southbound US-101 will be closed from midnight to 5 a.m. during the same day. Two lanes will be open for traffic.

The Atherton Avenue on- and off-ramps on Southbound US-101 are scheduled to be closed from Wednesday, Sept. 4 until Friday, Sept. 6 from 10 p.m. until 6 a.m. the next mornings. The De Long off-ramp will be closed during the same time period.

The far right-lane on Southbound US-101 will be closed from 9 p.m. to 5 a.m. during the same days. Two lanes will be open for traffic.

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

• On-ramp closure: Drivers should use southbound Redwood Boulevard and enter Southbound US-101 at De Long Avenue.
• Off-ramp closure: Drivers should use exit at De Long Avenue, turn right, and use Redwood Boulevard.

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

• Drivers should take the off-ramp at De Long Avenue, turn right, and use Redwood Boulevard.

All work depends on weather.

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. Caltrans thanks motorists for their patience while we work to maintain our state's highways, bridges, and tunnels.

For real-time traffic, click on Caltrans QuickMap: https://quickmap.dot.ca.gov/
For 24/7 traffic updates, follow 511.org: https://x.com/511SFBay

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