UPDATE: 55-Hour Full Closure of State Route 37 Between Mare Island and Sears Point in Solano County

Schedule: Friday, October 23, from 10:00 PM to Monday October 26, 5:00 AM
*** All work is weather dependent ***

Solano, Napa and Sonoma Counties - Caltrans District 4 will be implementing multiple closures on SR-37 in both Eastbound (EB) and Westbound (WB) directions as part of emergency preparedness for El Niño storm preparedness. Crews are expediting work requiring full closures of the route.

Schedule:
Wednesday Overnight Closure has been CANCELLED due to potential weather conditions:
Wednesday October 21 through Thursday October 22 from 7:00 p.m. and 4:00 a.m. has been CANCELLED

Updated Schedule:
Overnight Closure:
Thursday October 22, through Friday October 23 from 7:00 p.m. and 4:00 a.m.

Caltrans will be closing WB lanes to prepare for the weekends 55-hour closure.

55 Hour Weekend Closure:

• Friday October 23, at 10:00 p.m. to the following Monday October 26, at 5:00 a.m.

EB and WB Lanes on State Route - 37 (SR-37) from Mare Island in Vallejo and Sears Point in Sonoma County. Work will consist of median demolition and k-rail installation to shift both EB and WB traffic to the WB Lanes.

Once the shift is complete Crews will focus their efforts on the EB lanes to raise portions of the roadway by 3 feet to improve resiliency and address flooding concerns along this vital transportation corridor.

Changeable Message Signs (CMS) have been deployed throughout the region to notify motorists of the upcoming closure and encourage travelers to plan ahead.

Detours routes are as follows:

EB SR-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-12, 1(Carneros Hwy) and continue; Right on SR-12/SR-29; Enter left for the connector loop Off-ramp back to EB SR-37.

WB SR-37 Detour:

Motorists traveling Westbound on SR-37 will need to exit right onto northbound SR-29 in Napa, and follow SR 29 to WB SR 12 then to SB SR 121;

What Motorists Should Know

• Westbound SR-37 will be closed nightly from 7 p.m. to 4 a.m. on Thursday, Oct. 22, and Friday, Oct. 23.
• During 55-Hour Closure, SR-37 will be fully closed in both directions between Mare Island and Sears Point from;
• Closure starts: Friday, Oct. 23, at 10 p.m.
• Closure ends: Monday, Oct. 26, at 5 a.m.
• Expect significant delays and increased travel times
• Use alternate routes whenever possible
• Follow posted detour signs and traffic control devices
• All work is weather dependent