- Caltrans Statewide
- District 4 Home Page
- District 4 Departments
- Organizational Chart
- Contact District 4
MSN 101 Petaluma Blvd South Interchange and Petaluma Bridge Project Interstate 116 Interchange Project
Lane Configuration and Speed Limit
In November 2014, just south of the Petaluma River on U.S. 101, Caltrans switched northbound traffic to new lanes in the median. This traffic switch was necessary to begin demolition of the old northbound bridge. For the current traffic configuration, be aware that maximum speed limits have been reduced:
- The northbound speed limit is 45 MPH
- The southbound speed limit is 55 MPH
- In the interests of public safety, the California Highway Patrol has been requested to increase traffic enforcement in the project area.
- In addition, if your vehicle is disabled in the construction zone, please remain inside your vehicle until emergency services arrive to assist you. Do not exit the vehicle while parked in live traffic.
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.
Public Information Officer
Caltrans, District 4, Office of Public Affairs
Office (510) 286-5445
"Slow or Move Over for Workers--It's the Law"