Sonoma County Bi-Monthly Caltrans Update
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Welcome to the March 2025 edition of the Caltrans Sonoma County Newsletter, where we discuss upcoming and ongoing Caltrans projects in Sonoma County. We aim to keep you informed!
Caltrans Installs 120-foot Girders to Span Freeway for the Hearn Avenue Overcrossing Project in Santa Rosa
Workers building the retaining wall on the east side of the freeway
Highway 101 was closed at Hearn Avenue in Santa Rosa for two nights in mid-February, allowing workers operating a 550-ton crane to hoist 120-foot girders and set them into place.
The girders will support the new Hearn Avenue overcrossing, the central element of the project that has been under construction since March 2024.
During the project, the existing overcrossing, which has one lane in each direction and a single sidewalk, will be replaced with two traffic lanes in each direction, two bicycle lanes per direction, and two standard sidewalks on each side.
To this point, Caltrans has been building retaining walls, abutments and columns, things that will support the new four-lane overpass. Impressive large-scale construction, but after Caltrans places the girders, the project will take on the unmistakable appearance of a large freeway overcrossing being constructed.
With its bicycle lanes and new sidewalks, the Hearn Avenue project is an example of Caltrans’ Complete Streets Program, which adds multimodal upgrades to new projects when feasible.
The project is a partnership between Caltrans, the Sonoma County Transportation Authority, and the City of Santa Rosa. For more information go to US 101/Hearn Avenue Regional Multimodal Interchange | Caltrans
120-foot girders will be placed on columns in the center median and on the abutment on each side of the freeway.
Retaining wall on west side adjacent to the Santa Rosa DMV
One-Directional Travel on Four Highway 101 Overcrossings in Mid-to-Northern Sonoma County to Replace Bridge Railings
Project will last until October 2025
Caltrans has restricted travel to one direction on four overcrossing Highway 101 overcrossings in central and northern Sonoma County. The closures may last until mid-October 2025. Restricting access to only one-direction of traffic with provide enough room for workers and equipment to remove replace existing bridge steel bridge railing with sturdier concrete barrier.
The overpasses included in the project are: Mendocino Avenue, Fulton Road, Shiloh Road and Limerick Lane. Three of the road passes over the freeway, while Fulton Road passes below.
Currently the westbound direction of the Mendocino Avenue overpass is closed, the southbound direction of the Fulton Road underpass, and the eastbound directions of the Shiloh Road and Limerick Lane overpasses.
During the project, work crews will replace the existing banister and tubular bridge railings with a concrete barrier, topped with decorative lattice for visual appeal.
The concrete barriers can withstand greater impacts during collisions and are much easier to maintain and sweep beneath.
Old Tubular bridge railing (foreground) and lattice guardrail (background) will be replaced
New Concrete barrier with lattice on top
Landslide Repair on Hwy 1 near Bodega Bay
Caltrans crews activated one-way traffic control on April 7, on State Route 1 in Sonoma County about three miles east of Bodega Bay. Two traffic signals, a tenth of a mile apart, will alternate northbound and southbound traffic, allowing work crews to repair a landslide that undermined the shoulder of the southbound lane last December.
Caltrans will build a retaining wall to bolster the roadbed that was severely eroded on December 18, 2025, when a nearby creek, swollen by several days of rain, washed away much of a slope supporting the highway.
Caltrans estimates that the retaining wall will be complete in September 2025, at which time, the one-way traffic control will be lifted.
Caltrans is building a retaining wall to shore up the failing slope along Highway 1 east of Bodega Bay
Setting the PACE: Public Affairs Customer Engagement Site is Now Live!
District 4 is proud to announce the launch of our new Customer Service Request (CSR) platform. PACE, the Public Affairs Customer Engagement site, provides a regularly updated breakdown of services requested and rendered across the district.
- The CSR dashboard aims to provide an overview of the responsiveness to maintenance services requested across the nine Bay Area counties.
- The data represented as month-to-date falls within a rolling 30-day Service Level Agreement (SLA) and is updated weekly.
- We strive to close 60% (or more) of all monthly service requests received via the CSR website portal.
- For more information or to leave comments/suggestions, please contact D4CSLTEAM@dot.ca.gov.
- To report a highway issue/problem, please submit a CSR ticket through the Customer Service Request Form.
The Sonoma County newsletter will be distributed on a regular schedule.
For 24/7 traffic updates, please visit 511.org or https://twitter.com/511SFBay
For real-time information, please visit Caltrans QuickMap: https://quickmap.dot.ca.gov
CONTACT:
Jeff Weiss
Sonoma County Public Information Officer
General Information
(510) 286-4444
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