Caltrans is narrowing Highway 37 to one lane in each direction at the Petaluma River Bridge, on the Marin-Sonoma county line, on three days this week for its bridge rehabilitation project.
Why it matters: Highway 37 is a main route between Novato and Vallejo, and the bridge has only two lanes each way. The Monday closure runs nearly a full day, Bay City News reported.
Closure schedule
- Monday, Nov. 9: One lane each direction closed from 7 a.m. to 6 a.m. Tuesday.
- Tuesday and Wednesday: No closures, for Veterans Day.
- Thursday and Friday: One of two lanes each direction closed from 7 p.m. to 6 a.m. the next morning.
Crews will install temporary support beams under and beside the bridge and prepare to remove the outside bridge barrier.
The project
The work is expected to take about two years and includes rehabilitating the bridge deck and upgrading barriers and railings, according to Caltrans. It does not address long-term sea-level rise on Highway 37. Separate rebuilds of the nearby Tolay Creek and Novato Creek bridges are tentatively set to start in 2027. Caltrans posts live conditions on QuickMap and 511.org.
Related: El Niño flooding risk on Highway 37.