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

Monday, April 27, 2026, through Friday, May 1, 2026.

Sonoma County - Caltrans will perform nighttime intermittent ramp and connector closures along both northbound and southbound U.S. Highway 101 (US 101) between Rohnert Park and Santa Rosa, and eastbound and westbound State Route 12 (SR 12) between Farmers Lane and Stony Point Road, beginning Monday, April 27, 2026, through Friday, May 1, 2026. 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:

April 27 through May 1, from 8:00 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.

Please visit Caltrans QuickMap: http://quickmap.dot.ca.gov or follow Caltrans on Twitter at: https://twitter.com/CaltransD4

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