Schedule: Monday, Oct. 20 through Friday, Oct. 24 from 9:30 p.m. until 7:30 a.m.
Marin County — Caltrans has scheduled ramp and lane closures for electrical work on Northbound and Southbound US-101 for the Marin Sonoma Narrows B7 project from Monday, Oct. 20 through Friday, Oct. 24 from 9:30 p.m. until 7:30 a.m. the next mornings.
Work is weather dependent.
The schedule for ramp closures is as follows:
Monday, Oct. 20: The San Antonio Road on-ramp on Northbound US-101.
Tuesday: Oct. 21: The San Antonio on- and off-ramps on Southbound US-101.
Thursday, Oct. 23: The Atherton Avenue off-ramp on Southbound US-101.
Friday, Oct. 24: The De Long Avenue on-ramp and Atherton Avenue on-ramp on Southbound US-101.
Detour for San Antonio on-ramp on Northbound US-101
- Drivers should enter Southbound US-101 at San Antonio Road, exit at the Atherton Avenue off-ramp and re-enter US-101 Northbound.
Detour for San Antonio on- and off-ramps on Southbound US-101
- San Antonio on-ramp closure: Drivers should take Northbound US-101 and exit at Kastania Road, turn left and re-enter Southbound US 101.
- San Antonio off-ramp closure: Drivers should continue southbound and exit at Atherton Avenue, turn left and enter Northbound US-101 to get to the San Antonio off-ramp.
Detours for Atherton on and off-ramp closures on Southbound US-101
- Atherton on-ramp closure: Drivers should travel Southbound on Redwood Boulevard and enter US-101 at De Long Avenue
- Atherton off-ramp closure: Drivers should exit at De Long Avenue, turn right and use Redwood Boulevard.
Detour for De Long on-ramp closure on Southbound US-101
- Drivers should travel Southbound on Redwood Boulevard and enter Southbound US-101 at Rowland Boulevard.
Lanes will be closed on Northbound and Southbound US-101 during the Monday through Friday timeline.
Daytime access will be available for motorists.
On Monday, Sept. 29, Caltrans opened the long-awaited, continuous HOV lanes (third lanes) on Northbound and Southbound US-101. This was another major milestone for the project. This work removed merges on Northbound US-101 (just north of Atherton Avenue) and Southbound US-101 (south of Kastania Road), which opened three continuous lanes through the project limits.
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.
For 24/7 traffic updates, follow 511.org: https://twitter.com/511SFBay
For real-time traffic, click on Caltrans QuickMap: http://quickmap.dot.ca.gov/
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