Ramp, Lane Closures on Northbound, Southbound US-101 as Part of Marin Sonoma Narrows B7 Project in Marin County

Schedule: Tuesday, June 16 to Thursday, June 18 from 8:30 p.m. to 6:30 a.m.

Marin County - Caltrans has scheduled ramp and lane closures for drainage system improvements on Northbound and Southbound US-101 for the Marin Sonoma Narrows B7 project from Tuesday, June 16 through Thursday, June 18 from 8:30 p.m. until 6:30 a.m. the next mornings.

The schedule for ramp closures is as follows:

The San Antonio Road, Atherton Avenue and De Long Avenue on- and off-ramps on Southbound US-101 will be closed at various times during that time period.

The San Antonio Road on- and off- ramps on Northbound US-101 are scheduled to be closed during that time period.

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 has completed and allows continuous HOV lanes on US-101 from Sausalito in Marin County to Windsor in Sonoma County.

All work is weather dependent.

Detours for San Antonio Road on-ramps on US-101

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

Detours for San Antonio Road off-ramps on US-101

• Northbound: Drivers must exit at Petaluma Boulevard South/ Kastania Road, enter US-101 southbound, and exit at San Antonio Road
• Southbound: 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 De Long Ave. on- and off-ramp closures on Southbound US-101

• On-ramp: Drivers should travel Southbound on Redwood Boulevard and enter Southbound US-101 at Rowland Boulevard.
• Off-ramp: Drivers should exit at Atherton Avenue and then use Redwood Boulevard to reach De Long Avenue.

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

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

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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