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Route 12 Laguna de Santa Rosa Project

On Monday, July 11, Caltrans will begin pile-driving for the new foundation of the second half of the new bridge. Work hours will be Monday through Saturday, July 16, from 7 a.m. until approximately 8 p.m. This work is expected to be complete by Saturday, July 16, but could continue into the week of July 19 if necessary. Pile-driving is a noisy operation and depending on your location, residents and businesses may notice increased noise during this work. All work depends on weather conditions and will be rescheduled if necessary.

Future construction activities include:

  • Construction of second half of bridge
  • Opening new bridge to traffic
  • Establish landscaping
In June 2015 Caltrans began construction on State Route 12 at the Laguna de Santa Rosa bridge. Over two construction seasons Caltrans will replace the existing Laguna de Santa Rosa Bridge on State Route 12 with a new two-lane bridge that complies with the current Caltrans roadway standards of 12 ft. lanes and 8 ft. shoulders. In addition, there will be 7 ft. sidewalks on both sides of the highway (on the bridge). One-half of the bridge will be constructed in one season; traffic will be shifted to the new bridge; demolition will take place on the old bridge; then the final portion will be built in the second construction season. The majority of the work will take place during the day, but residents may notice increased noise from construction and mandatory backup alarms. Construction is expected to be complete in 2017. Upcoming Construction Activities:
  • The week of June 22 the contractor will begin pile driving for the new bridge. The work will continue for about three weeks from 7 a.m. to 7 p.m., Monday through Friday.
  • Pile-driving is a noisy activity. Residents and businesses may notice increased noise.
The majority of the work will take place during the day, but some night work will be necessary. Construction may on occasion require a lane closure with one-way traffic control. During traffic shifts or other activities, there may also be full closures with traffic detoured to city or county roads.

If work is delayed due to weather conditions, it will be rescheduled. Please drive cautiously through the construction zone, leave a safe traveling distance between your vehicle and the vehicle ahead of you, and Slow for the Cone Zone.

For more information about the project, please contact:

Allyn Amsk
Caltrans Public Information Officer, Sonoma County
(510) 286-5445