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

Published: Jan 24, 2025

Schedule: Monday, Jan. 27 to Wednesday, Jan. 29 from 10 p.m. until 6 a.m.

MARIN COUNTY - The Marin-Sonoma Narrows B-7 construction project continues in January with guard rail installation, which requires a ramp closure on Southbound US-101 near Novato.

The San Antonio Road on-ramp on Southbound US-101 is scheduled to be closed on Monday, Jan. 27 between 10 p.m. and 6 a.m. the next morning. One lane is scheduled to be closed from Monday, Jan. 27 to Wednesday, Jan. 29 between the same hours. At least one lane will be open for traffic.

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

Detour for San Antonio on-ramp closure on Southbound US-101

• Drivers should take Northbound US-101 and exit at Kastania Road, turn left and re-enter Southbound US-101.

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.

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