Napa Supervisors discuss sea level challenges to Hwy 37

Napa County supervisors are keeping an eye efforts to save Highway 37 along San Pablo Bay from perhaps one day disappearing beneath rising bay waters.


Highway 37 passes over wetlands skirting the bay to link Solano, Sonoma and Marin counties. Although it barely grazes Napa County, the road is a major, regional corridor that the state Department of Transportation says is traveled by an average of about 40,000 vehicles daily in the local sections.

What would happen if 21-mile-long Highway 37 someday went underwater because of predicted sea level rise and was abandoned by the state?

“I don’t think anyone on this Board would want to see the alternative, which is to change Highway 121 to a four-lane road all the way through, which would require the taking out of very premium vineyard land in both Napa and Sonoma counties,” Supervisor Keith Caldwell said.

Highway 121 runs through the Carneros region in southern Napa County. It already handles higher traffic loads when accidents block the eastern Highway 37 segment.

The Napa County Board of Supervisors heard a Highway 37 update at its Dec. 20 meeting.

Napa County has another reason to be interested in Highway 37’s fate, Napa Valley Transportation Authority Executive Director Kate Miller said. About 13 percent of Highway 37 trips on an average weekday start locally.

Highway 37 isn’t going anywhere overnight. Still, some sections already go…

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