Highway 37 Closures Begin Thursday for Flood Resilience Work

heavy road construction equipment parked alongside an asphalt highway running through a flat coastal marshland, orange traffic cones blocking off a lane under a

AI-generated illustration; not a photograph of the reported event.

Highway 37 Closures Set to Begin Thursday Night

Caltrans has announced the start of a series of planned overnight closures on Highway 37 in the North Bay, beginning Thursday, October 21, 2026. The closures are part of ongoing efforts to address flooding concerns along this vital stretch of roadway.

Revised Closure Schedule Due to Weather Conditions

The original plan had highway 37 closures scheduled to begin Wednesday night. However, Caltrans rescheduled the work to Thursday after evaluating potential weather conditions that could impact the project. The adjustments aim to safely accommodate the highway improvements, given the unpredictable weather patterns expected in the region.

Scope of Caltrans Highway Work on Highway 37

The closure affects the section between Mare Island in Vallejo and Sears Point in Sonoma County. According to Caltrans, the work includes raising select portions of Highway 37 by three feet. This measure is intended to enhance the highway's flooding resilience and help prepare for the anticipated heavy rains and El Niño impacts becoming more common in recent years.

Details of Overnight Highway Closures

The first closure will occur in the westbound direction only, beginning Thursday night at 7 p.m. The roadway will reopen by 4 a.m. Friday. Following this, both eastbound and westbound directions will close at 10 p.m. Friday night. The full closure will continue through the weekend, with the highway set to reopen at 5 a.m. on Monday. Commuters and travelers are advised to plan alternate routes during these periods.

The Importance of Highway 37 and Flooding Concerns

Highway 37 runs along the northern edge of San Pablo Bay, serving as an essential transportation corridor for the region. Approximately 40,000 vehicles use the highway each day. Past highway 37 flooding events have underscored the need for flood-resistant infrastructure, prompting Caltrans to act quickly in preparation for future weather events associated with El Niño. The solano county roads project aims to provide lasting benefits for both daily commuters and long-distance travelers in the region.

Preparing for El Niño and Future Flooding

These overnight highway closures are a critical step in the broader strategy to strengthen transportation corridors against extreme weather. Caltrans encourages the public to remain informed about closure updates and ongoing highway 37 work, emphasizing the goal of minimizing future disruptions caused by flooding.

Source: kron4.com.