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State Route 37 Pavement Project

Banner logo for State Route-37 Pavement Project. Includes the California 37 highway sign to the left of the project name. The Caltrans Bay Area logo is included above the project name.

Caltrans will begin work on Eastbound State Route 37 (SR-37). EB SR-37 will be closed, and motorist detoured beginning at the SR-37/SR-121interchange near Sears point (Sonoma County). The Eastbound closures will be 55 hours, starting Friday, May 10 at 10:00 PM to Monday, May 13 by 5:00 AM and from Friday, May 17 10:00 P.M.  to Monday, May 20 at 5:00 A.M. 

During the 55-hour weekend full highway closures, Caltrans will perform major pavement repair work on EASTBOUND SR-37 between Solano and Sonoma counties. One traffic direction on SR-37 will be worked on at a time. Detours on eastbound SR-37 will be in effect. Westbound SR-37 will remain open at all times.

Media Resources

Additional project resources including downloadable maps, image galleries, and video clips can be found on the media resources page.

Eastbound SR-37 Full Highway Closures at SR-121 (Sonoma) to SR-29 (Vallejo) Weekends of May 10 & May 17

Weekend closures on eastbound (EB) SR-37 are scheduled on the weekend of May 10 & May 17. EB SR-37 will be closed and traffic detoured beginning at the SR-37/SR-121 interchange at Sears Point in Sonoma. Closures will start Friday May 10 at 10:00 PM. to the following Monday May 13 at 5:00 AM. and have been scheduled for Friday, May 17 10:00 P.M. and conclude following Monday May 20 at 5:00 A.M. During the 55-hour weekend full highway closures, Caltrans performs major pavement repair and maintenance work on eastbound SR-37 between Solano and Sonoma counties. One traffic direction on SR-37 is worked on at a time. Detours are in effect. All work is weather dependent. More information to follow.

If you have a question or want to share a concern about the project, please call the SR-37 Pave Project Hotline (510) 286-0319.

Eastbound State Route 37 Detour

  • Motorists traveling eastbound on SR-37 will need to exit left onto northbound SR-121 in Sonoma
  • Make a right on SR-12/SR-121(Carneros Hwy) and continue
  • Right on SR-12/SR-29
  • Enter left for the connector loop Off-ramp back to EB SR-37

Detour map for closure of eastbound State Route 37 at SR-121 in Sonoma County. EB SR-37 Detour: Left on NB SR-121 Connector; Right on SR-12/SR-121 (Carneros Hwy); Continue on SR-12/SR-121 (Carneros Hwy); Right on EB SR-12/SB SR-29; Connector Loop On-ramp to EB SR-37.

Why The Work is Needed

These full weekend closures are necessary for worker and public safety. Caltrans will perform major pavement repair on the traffic lanes in both the eastbound and westbound directions of SR-37. The roadway has become worn and in need of repairs due to of high traffic use.

Closing SR-37 During Weekends is a Safer Alternative to 30 Days of Nightly Closures for Workers' and Motorists' Safety

These closures will allow for asphalt pavement in eastbound and westbound traffic lanes to be replaced. These closures will shorten the duration of the project by 30 nights providing improved safety and better ride quality to the public.

Contact Information

If you have a question or want to share a concern about the project, please call the 37 Pave Project Hotline (510) 286-0319. The hotline has been set up for the traveling public and residents living in Marin, Sonoma, Napa and Solano Counties to share any questions or concerns and learn about the most up to date information about the project.