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State Route 37 will completely close in both directions between Mare Island (Vallejo) and Sears Point (Route 121) from 10:00 p.m. Friday, October 23, to 5:00 a.m. Monday, October 26, 2026.

1001 Fairgrounds Dr, Vallejo, CA 94589

Closure Details & Schedule

  • Overnight Westbound Closures: Westbound lanes will close ahead of the weekend from 7:00 p.m. to 4:00 a.m. on Wednesday, October 21, and Thursday, October 22, to set up temporary barriers and shift traffic.
  • Main 55-Hour Closure: Friday, Oct. 23 (10:00 p.m.) through Monday, Oct. 26 (5:00 a.m.)
  • Detours & Alternate Routes: Motorists are advised to use alternative detours, utilizing Highways 12, 29, and 121. Expect significant delays and allow extra travel time.

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;