Lane Reductions For Week of November 16: State Route 37 – Petaluma River Bridge, Marin County

Monday, November 16 until morning of Saturday, November 21, 2026
Weather Permitting

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, November 16 work will require weeknight single-lane reductions Monday through Friday. All work is weather permitting.

Starting Monday, November 16, one lane in each direction will be closed Monday through Friday nights from 7 p.m. until 6 a.m. the next mornings. During this phase of work, one traffic lane in each direction will remain open at all times.

These lane closures will involve crews shifting traffic lanes and installation of false work which will help crews safely construct new bridge railings.

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