Lane Reductions for Week of November 9, State Route 37 – Petaluma River Bridge, Marin County

Monday, Nov. 9; Thursday, Nov. 12 to Saturday, Nov. 14
Construction Project Duration-October 2026-Tentative July 2028

Marin County - Caltrans is continuing a structural rehabilitation project on State Route 37 (SR-37) at the Petaluma River Bridge, at the Marin-Sonoma County line. The week of Monday, Nov. 9 work will require weeknight single-lane reductions except Tuesday and Wednesday due to the Veteran's Day Holiday.

On Monday, Nov. 9, one lane in each direction will be closed from 7 a.m. until 6 a.m. the next morning.

There will be no lanes closures on Tuesday, Nov. 10, nor Wednesday, Nov. 11 due to the Veterans Day holiday.

On Thursday, Nov. 12 and Friday Nov. 13, one of two lanes in each direction on the bridge will be closed 7 p.m. until 6 a.m. the following mornings.

These lane closures will involve the installation of temporary support beams beneath and alongside the bridge, as well as preparation for the removal of the existing outside bridge barrier.

The entire project is expected to take approximately two years, depending on weather and other field conditions.

Work will include rehabilitating the bridge deck and upgrading the bridge barriers and railings to meet current safety standards.

This project focuses on rehabilitating the SR-37 Petaluma River Bridge and does not directly address long-term efforts to protect SR-37 from sea level rise.

Separate projects to reconstruct the nearby SR-37 Tolay Creek Bridge and SR-37 Novato Creek Bridge are tentatively scheduled to begin in 2027.

In August 2026, the California Transportation Commission (CTC) approved more than $300 million to advance sea-level-rise resilience projects throughout the SR-37 Corridor. These efforts mark the first set of SR-37 Corridor resilience projects moving forward.

For the latest updates on work at the SR-37 Petaluma River Bridge, visit: State Route 37 Petaluma River Bridge Preservation Project | Caltrans

For updates on upcoming Resilient SR-37 projects addressing sea-level-rise improvements, visit: SR37 Corridor Projects | Caltrans