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

Published: Sep 20, 2024

Schedule: Monday, Sept. 23 through the morning of Saturday, Sept. 28

Marin County - The Marin-Sonoma Narrows B-7 construction project continues in September with new electrical lightning and ramp metering work, which requires ramp closures on Northbound US-101 near Novato.

The San Antonio Road on- and off-ramps on Northbound US-101 are scheduled to be closed on Monday, Sept. 23 and Tuesday, Sept. 24 from 10 p.m. until 6 a.m. the next mornings. One of two lanes will be closed as well during the same days and times.

The De Long Avenue on-ramp will be closed Wednesday, Sept. 25 through Friday, Sept. 27 between 8 p.m. and 5 a.m. the next mornings. One lane out of three will be closed between 9 p.m. and 7 a.m. during the same days.

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

Detour for on- and off-ramp closures on Northbound US-101

• San Antonio on-ramp closure: Drivers must enter on US-101 southbound at San Antonio Road, exit at the Atherton Avenue off-ramp and then re-enter US-101 northbound.
• San Antonio off-ramp closure: Drivers must exit at Petaluma Boulevard South/ Kastania Road, enter US-101 southbound, and exit at San Antonio Road.
• De Long on-ramp closure: Drivers should use Northbound Redwood Boulevard and enter Northbound US-101 at Atherton Avenue.

This project hit another milestone on Aug. 30, 2024, when the deck of Southbound Franklin Avenue Overhead was poured as this was the last of the deck pours for the project. That bridge widening is the last bridge structure that will be widened as part of the Marin-Sonoma Narrows program.

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