Caltrans to Remove Part of US 101 Overpass in Petaluma


District: 4 – Oakland 
Contact: Jeff Weiss                                 
Phone: (510) 715-8770

Caltrans to Remove Part of U.S. Highway 101 Overpass in Petaluma Night work, Friday – Saturday, February 5 - 6, to remove portion of elevated freeway for widening project

SONOMA COUNTY - As part of the project to widen U.S. Highway 101(U.S. 101) through Petaluma, Caltrans will demolish the right lanes of the Petaluma Overhead, the elevated highway that travels above the SMART railroad tracks between E. Washington Street and the Corona Road overcrossing.  

Work will occur at night between 10:00 PM – 6:30 AM, Friday and Saturday February 5-6, 2021 on northbound U.S.101 about a half-mile north of the E. Washington Street interchange to the Corona Road overcrossing.

No Lane Closures 

Lane closure will be unnecessary because the demolition work can be performed beneath the freeway. The demolition will be noisy, but Caltrans must perform the work at night to avoid interfering with the SMART trains that travel below the freeway during the day. 

petaluma overpass map

On January 14,  2021, northbound traffic was shifted to temporary lanes where the median once was located.  The shift will allow Caltrans to demolish the newly vacated lanes this weekend, part of the project to widen the freeway. 

Caltrans is demolishing and rebuilding the Petaluma Overhead in stages, which allows traffic to use the elevated freeway during the construction process.  
The project is scheduled for completion in late 2022. 

Caltrans is adding a carpool lane to northbound and southbound Highway 101, creating a six-lane freeway of three lanes in each direction between Lakeville Highway (Route 116) and the Corona Road overpass.

The project is one of 13 projects in the larger Marin Sonoma widening project that will add a carpool lane in each direction between State Route 37 in Marin and Corona Road in northern Petaluma.
For 24/7 traffic updates, go to You can also get real-time information on all State Highways in California on our Caltrans Quick Map:  Please be #WorkZoneAlert

Or follow Caltrans on Twitter at