Drivers on northern Marin County’s busy State Route 37 should brace for lane closures in early September. Caltrans is kicking off a maintenance and repair blitz that’ll impact the Novato stretch from Atherton Avenue to the Petaluma River Bridge.
This project aims to make things safer and give the roadway some much-needed life. Crews will work on concrete barrier transitions, grind pavement, and repave about three miles—a stretch that thousands rely on every day for their commute between Novato, Sonoma County, and beyond.
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Caltrans Maintenance Project in Novato
State Route 37 connects Marin County towns like Novato, Sausalito, and San Rafael, then heads east toward Vallejo and Napa. Caltrans’ latest Capital Preventive Maintenance push focuses on both immediate safety and long-term fixes.
The upcoming lane closures let crews tackle the concrete barrier transitions with less risk, and they’re trying to avoid the worst of the rush hour mess.
Scheduled SR-37 Lane Closures
Here’s what drivers need to know about the timing, so you can plan ahead:
- Eastbound SR-37: One lane will close daily from Wednesday, September 3 through Friday, September 5, between 4 a.m. and 1 p.m.
- Westbound SR-37: One lane will close daily on those same dates, from 9 a.m. to 5 p.m.
The construction zone runs from the Ignacio overpass in Novato to the Petaluma River Bridge. That’s roughly three miles of work, and the schedule could shift if the weather doesn’t cooperate.
Why This Work Matters for Marin County
For folks in Novato, Marinwood, and the North Bay, SR-37 is a lifeline. Any disruption here spills over into places like San Rafael and Larkspur.
Grinding, repaving, and barrier upgrades will smooth out the ride and cut down on wear-related hazards. It’s not glamorous, but it’s how you keep things from breaking down even worse later.
Impact on Daily Commutes
There’s no way around it—some delays are coming. Caltrans is trying to soften the blow by scheduling work outside the worst commute hours.
Eastbound lanes get the early morning treatment; westbound crews start mid-day. If you’re heading from Novato toward Vallejo or coming back from Sonoma County, it might be smart to budget in a little extra time.
Staying Informed and Safe in Construction Zones
Caltrans wants drivers to slow down and pay attention in the SR-37 work area. Give workers space, keep your distance from other cars, and watch for sudden lane changes.
It’s easy to zone out, but a little caution goes a long way—for everyone.
Getting Real-Time Traffic Updates
To help drivers dodge the worst of it, Caltrans and local agencies have a few tools:
- 511.org for live traffic updates and alternate routes.
- Caltrans QuickMap for real-time lane closure info and incidents.
- Call 1-800-427-ROAD for the latest highway details.
Looking Ahead for Marin’s Roads
Marin County keeps pouring effort into road repairs and upgrades. You’ll spot everything from Highway 101 improvements in San Rafael to fresh pavement in Mill Valley and Tiburon.
The SR-37 work in Novato is just one piece of this bigger push to keep streets safe and drivable for locals and visitors. Sure, there will be some short-term delays, but these projects aim to make travel smoother in the long run for everyone moving around the North Bay.
For now, local drivers—maybe you’re commuting from Novato to San Francisco, or heading between Petaluma and Corte Madera—should keep the upcoming SR-37 lane closures in early September on their radar. Staying in the loop, planning alternate routes when you can, and actually paying attention through those work zones can really help these improvements move along safely.
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Here is the source article for this story: Day, Night Lane Closures for Westbound, Eastbound SR-37 Capital Preventive Maintenance Project in Marin County
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