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Released by: Transportation & Public Works
For Immediate Release

Highway 12 Southbound Detour July 9 th

Santa Rosa, CA  –  July 6, 2015  –  On July 9 th , 2015 southbound traffic on Highway 12 will be detoured onto Madrone Road, Arnold Drive, and Verano Avenue from 9 am - 8 pm. There will be access to homes and businesses throughout the detour. This is the second of two detours that will allow PG&E to complete an essential tie-in of their gas transmission lines for the Highway 12 Improvement Project. 

"The first detour went very smoothly. This second detour will follow the same route and timeline as last time," said Sonoma County Board of Supervisor Susan Gorin. "Our Springs community and road users have been patient and understanding through utility relocations on Highway 12. This tie-in marks the end of a major portion of PG&E's work on the road."

Detour Details:

  • Time: 9 am - 8 pm
  • Route: From Highway 12 southbound, right on Madrone Road, left on Arnold Drive, and left on Verano Avenue
  • Delays: Signals on Arnold Drive will be adjusted to improve traffic flow, however motorists should expect delays between 15 and 30 minutes. 

There will be flaggers at each intersection of the detour. California Highway Patrol will be present at the intersections in peak commute hours from 3 pm - 7 pm. Drivers will be alerted to the changed conditions with roadside message boards. At 8 pm the detour will end, and traffic controls will resume the current practices of alternating traffic with one way lane closures.

On June 22 nd PG&E successfully tied in transmission lines on Highway 12 near Sunnyside Road, on July 9 th the tie-in will take place near Fetters Creek. Many utilities, such as PG&E, have utility lines that run under Highway 12. To make room for structural improvements to the road, some utilities have to be relocated. PG&E requires a continuous 22-hour work period to complete the tie-in. To accommodate the long work shift and provide the best option for motorists, the combination of a daytime southbound detour and nighttime alternating traffic was selected.

This final tie-in of the PG&E transmission lines is a key milestone in the Highway 12 Improvement Project, which will bring pedestrian and bicycle facilities, roadway widening, asphalt pavement replacement, installation of curbs, gutters and sidewalks, and many more upgrades to Highway 12 between Agua Caliente Road and Boyes Boulevard in the Springs Area of Sonoma Valley. 

Sonoma County Transportation and Public Works and their partners would like to thank Highway 12 users and the people living and working in the Fetter Hot Springs - Agua Caliente community for their patience. Please contact Transportation and Public Works at 707- 565-2533 with any questions.

Our Mission:  to plan, build, manage, and maintain Sonoma County's investment in quality services and infrastructure.  

Our Vision:  Leading the way to a safe and sustainable community through stewardship and innovation.


Contact Information

Dan Virkstis

Public Affairs Program Manager

Business Hours
Monday – Friday
8:00 AM – 5:00 PM


La Plaza B
2300 County Center Drive
Suite B 100
Santa Rosa, CA 95403
38.462006, -122.725384