Road Construction Updates

Click here to download current Road Closure Schedule for the City of Petaluma

MSN 101 Petaluma Blvd South Interchange and Petaluma Bridge Project Interstate 116 Interchange Project

The Petaluma Blvd South Interchange project
will construct a new interchange at Petaluma Blvd South, frontage roads and replace the Petaluma River bridge. The existing Petaluma River bridge is an 866 feet long, twin reinforced concrete box girder (with pre-cast I girder span over the river) bridge that was built in 1955. The existing bridge has two lanes of traffic in each direction and no shoulders The new bridge will be 907 feet long with three lanes of traffic in each direction and standard shoulders. This will be one of the longest precast, post-tensioned spliced concrete girder bridges in the U.S. Constructing the new bridge over the Petaluma River, which is a navigation channel, will be very challenging. The bridge will be constructed in three stages and require erection of 99 girders up to 130 feet in length and weighing up to 60 tons each.

The project will also replace the existing South Petaluma Blvd On/Off Ramps constructed underneath Highway 101 in the mid 1950's with a new "diamond" interchange with a decorative gateway structure (overcrossing).

Construction is anticipated to be complete by the end of in 2016.

The Route 116 (Lakeville) interchange project will replace the northbound U.S 101/116 separation bridge and widen southbound U.S 101/116 Separation Bridge to accommodate future HOV lanes in both directions from the Petaluma River Bridge to State Route 116.

The existing bridges have 2 lanes with no shoulder and were built in 1955. The new and widened bridges will have three lanes in each direction with standard shoulders

The project will also install sound walls along the on-ramp from Route 116 to northbound Highway 101 just beyond the Caufield Lane Overcrossing.

Challenges for this project will be working adjacent to and over the SMART Railroad tracks and Highway 116

Construction is anticipated to be complete by mid 2015.
Thank you,

Allyn Amsk
Public Information Officer
Caltrans, District 4, Office of Public Affairs
Office (510) 286-5445

"Slow or Move Over for Workers--It's the Law"


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