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Highway SR-121 Lane Closures, Road Construction and Blocked Lanes

The following is a list of CalTrans lane closures, road construction, and blocked lanes that are active or plannded for on Highway SR-121

CalTrans Lane & Road Closures on Highway SR-121

How does freeway lane numbering work?
121

South

Active

In Petaluma All lanes will be closed multi-day (long term) for grinding and paving along Southbound Highway 121 at Route 121 from May 17 at 11:01PM to May 20 at 4:59AM.

From: Route 121 to Route 37 in Petaluma
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ID: C121LA-0001-2024-05-17-23:01:00
See all lane closures...