Intermittent Ramp and Connector Closures on US 101 and SR 12, for Installation of Horizontal Curve Signs in Santa Rosa and Windsor, Sonoma County

Sunday, May 3, through Friday, May 8, 2026

Sonoma County - Caltrans will perform nighttime intermittent ramp and connector closures along both northbound and southbound U.S. Highway 101 (HWY 101) between Baker road, Santa Rosa and Shilioh road, Windsor, and eastbound and westbound State Route 12 (SR 12) connectors to northbound and southbound HWY 101, Sunday, May 3, through Friday May 8. The closures are necessary to allow crews to install horizontal curve warning signs at various on- and off-ramps. This work enhances safety for motorists by improving roadway visibility and driver awareness along curved segments.

All work is weather dependent.

Nightly Ramp and Connector Closures:
May 3, through May 8, from 7:00 PM through 7:00 AM

What to Expect

• Detours will be in place and clearly marked, depending on the specific ramp or connector being closed
• Consecutive ramps will not be closed at the same time, ensuring continued access for local and through traffic

For 24/7 traffic updates, please visit 511.org: https://x.com/511SFBay
For real-time information, visit Caltrans QuickMap: https://quickmap.dot.ca.gov
Follow us on X: https://x.com/CaltransD4
Or call 1-800-472-7623, 1-800-427-ROAD for state highway conditions statewide.