Caltrans will implement overnight lane closures on State Highway 37 at the Petaluma River Bridge near the Marin-Sonoma County line as part of an ongoing structural rehabilitation project, the agency announced Friday.
The work, scheduled for the week of Nov. 9, will require lane reductions on Monday, Thursday and Friday. On Monday, one lane in each direction will be closed from 7 a.m. until 6 a.m. Tuesday, Caltrans said.
No closures are scheduled for Tuesday and Wednesday in observance of Veterans Day.
On Thursday and Friday, one of the two lanes in each direction will be closed from 7 p.m. to 6 a.m. the following morning.
Crews will install temporary support beams beneath and alongside the bridge and prepare to remove the existing outside bridge barrier, according to transport officials.
Caltrans said the approximately two-year project will include rehabilitating the bridge deck and upgrading barriers and railings to meet current safety standards.
The timeline is subject to weather and field conditions.
Caltrans noted that the project does not directly address long-term sea-level-rise concerns along Highway 37. Separate reconstruction projects for the nearby Tolay Creek and Novato Creek bridges are tentatively scheduled to begin in 2027.