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

Schedule: Monday, July 20 through Friday, July 24 from 8:30 p.m. to 6:30 a.m.

Marin County - Caltrans has scheduled ramp and lane closures for paving on Southbound US-101 for the Marin Sonoma Narrows B7 project from Monday, July 20 through Friday, July 24 from 8:30 p.m. until 6:30 a.m. the next mornings.

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.

Various lanes are scheduled to be closed as well.

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 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- and off-ramps on Southbound US-101

• On-ramp: Drivers should take Northbound US-101 and exit at Kastania Road, turn left and re-enter Southbound US 101.
• Off-ramp: 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 on- and off-ramp closures on Southbound US-101

• On-ramp: De Long on-ramp closure: 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 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.