Highway 37 in North Bay to close this weekend for El Niño storm preps

Highway 37 in the North Bay will shut down in both directions this weekend to allow Caltrans crews time to raise the flood-prone area ahead of a potentially powerful El Niño and winter storms.

Motorists traveling through the area should expect significant delays and increased travel times.

Here’s what to know about the closure and detour information.

When will Highway 37 shut down?

The closure on the highway starts at 10 p.m. Friday. Caltrans expects to reopen lanes by 5 a.m. Monday.

What part of Highway 37 will close during weekend closure?

Highway 37 will shut down between Mare Island in Vallejo and Sears Point in Sonoma County, according to Caltrans.

Detour information for Highway 37 closure

• Motorists traveling on eastbound Highway 37 during the closure will exit left onto northbound Highway 121 in Sonoma;
• Make a right on Highway 12, 1(Carneros Hwy) and continue;
• Right on Highway 12/Highway 29;
• Enter left for the connector loop off-ramp back to eastbound Highway 37.

• Motorists traveling on westbound Highway 37 will exit right onto northbound Highway 29 in Napa,
• and follow Highway 29 to westbound Highway 12,
• then to southbound Highway 121;

Why is Caltrans shutting down Highway 37?

Highway 37 near Mare Island has flooded repeatedly over the years.

Caltrans said the work is designed to help reduce flooding risks on the vital commuter route.

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