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 is scheduled to alternately close eastbound and westbound State Route 37 (SR-37) on four consecutive weekends starting the weekend of Friday, April 19, 2024. During the 55-hour weekend full highway closures, Caltrans will perform major pavement repair work on eastbound and westbound SR-37 between Solano and Sonoma counties. One traffic direction on SR-37 will be worked on at a time. Detours will be in effect. All work is weather dependent. 

Rescheduled: Westbound State Route 37 Full Highway Closures at State Route 29
Weekends of April 19 and April26

Weekend closure on Westbound (WB) SR-37 is scheduled on the weekends of April 19 & April 26. WB SR-37 will be closed and traffic detoured beginning at the WB SR-37 Connector Off-ramp to SR-29 in Vallejo. Closures will start Fridays at 9:00 PM and conclude on the following Mondays at 4:00 AM.

Westbound State Route 37 Detour

  • Motorists traveling westbound on SR-37 will need to exit right onto northbound SR-29 (Sonoma Blvd) in Vallejo
  • Continue on NB SR-29 (Broadway) in American Canyon to SR-29/SR-12
  • Turn left and continue on SR-12/SR-121 (Carneros Hwy/Fremont Drive)
  • Turn left on SR-121 (Arnold Drive)
  • Make a right back on WB SR-37.

Detour map for westbound State Route 37 closure at SR-29 in Vallejo. WB SR-37 Detour Via: WB SR-37 Connector Off-ramp to SR-29; Right on SR-29 (Sonoma Blvd.); Continue on NB SR-29; Continue SR-29/SR-12; Left on SR-12/SR-121 (Carneros Hwy); Continue to SR-12/SR-121 (Carneros Hwy);  Stay left on SR-12/SR-121 (Carneros Hwy/Fremont Dr); Left on SR-121 (Arnold Dr); Continue on SR-121 (Arnold Dr); Right on WB SR-37.

Eastbound State Route 37 Full Highway Closures at State Route 121
Weekends of May 3 and May 10

Weekend closure on Eastbound (EB) SR-37 is scheduled on the weekends of May 3 & May 10. EB SR-37 will be closed and traffic detoured beginning at NB SR-121 (Sears Point) in Sonoma. Closures will start Fridays at 10:00 PM and conclude on the following Mondays at 5:00 AM.

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.