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

Published: Dec 10, 2024

Schedule: Monday, Dec. 9 through the morning of Friday, Dec. 13

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

The San Antonio Road on-ramp and off-ramp on Southbound US-101 are scheduled to be closed on Monday, Dec. 9 between 10 p.m. and 6 a.m. the next morning.

The Atherton Avenue off-ramp is scheduled to be closed on Tuesday, Dec. 10 between 10 p.m. and 6 a.m. the next morning. The Atherton Avenue on-ramp is scheduled to be closed on Wednesday, Dec. 11 between the same hours.

The De Long Avenue off-ramp is scheduled to be closed on Southbound US-101 on Thursday, Dec. 12 during those same hours.

One of three lanes on Southbound US-101 is scheduled to be closed from Tuesday, Dec. 10 to Thursday, Dec. 12 during those same hours.

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.

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

• Drivers should continue southbound and exit at Atherton Avenue, turn left and enter Northbound US-101 to get to the San Antonio off-ramp.

Detour for Atherton off-ramp closure on Southbound US-101

• Drivers should exit at De Long Avenue, turn right and use Redwood Boulevard.

Detour for Atherton on-ramp closure on Southbound US-101

• Drivers should travel Southbound on Redwood Boulevard and enter Southbound US-101 at De Long Avenue.

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

• Drivers should exit at Atherton Avenue and then use Redwood Boulevard to reach De Long 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.

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