Hills Ferry Road Bridge Replacement Project
The Stanislaus County Department of Public Works, in partnership with Merced County, Caltrans, and the Federal Highway Administration, is replacing the Hills Ferry Road Bridge over the San Joaquin River, which connects Interstate 5 and US Highway 99 between Patterson and Los Banos.
Have questions or concerns? Please call our project hotline at 209-703-5873 or email hillsferryproject@gmail.com.
Project Background
The River Road Bridge, built in 1961, needs replacement due to structural weaknesses, safety concerns, and seismic risks. It is classified as "scour critical," indicating significant erosion of its foundation. This vital east-west connection between Interstate 5 and Highway 99 carries thousands of vehicles daily but features narrow lanes and an outdated design that poses safety hazards. In 2020, emergency repairs were necessary due to erosion, highlighting the urgent need for a long-term replacement to ensure safety and reliability.
Project Scope
The River Road Bridge replacement will construct a 750-foot, five-span bridge with better alignment and wider lanes for improved safety and traffic flow. It will feature two 12-foot lanes with 4-to-6-foot shoulders, accommodating all vehicles, including emergency services and trucks. Built north of the existing bridge, it allows traffic to continue using the current bridge during construction. Upgraded approach roads will improve connectivity, while seismic-resistant design and erosion control will ensure durability. The project meets environmental standards (CEQA & NEPA) with bioswales for runoff treatment and bank stabilization. Once complete, the old bridge will be dismantled, leaving a clean transition to the new infrastructure.
Benefits to the Community
Enhanced safety for daily commuters
Enhanced safety for daily commuters
Maintained vital transportation link between I-5 and US-99
Timeline
Project Updates
Construction Schedule April 2026
* Schedule subject to change
Crews are currently hauling in material and expect to wrap up import operations by the end of March. Next, crews will build the concrete approach slabs at both ends of the bridge. These slabs connect the new bridge to the roadway. That work is expected to start in mid-April on the west side and late April on the east side. Barrier rail and bike rail installation will also be underway during this time. Once the slabs are in place, the contractor will pave the first section of road ahead of a weekend closure of Hills Ferry Road, anticipated in late May, to tie everything together. After that, the new bridge is expected to open to traffic.
Important Notes for Residents:
Updates
Live Cameras
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