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connection between Interstate 5 and Highway 99 carries thousands of vehicles daily but features narrow lanes and an outdated design that poses safety hazards.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 January 2026
* Schedule subject to change
In January, crews are continuing work on the new Hills Ferry Bridge. Carpenters have finished building the formwork for the bridge deck, and ironworkers are now installing the steel reinforcement that will strengthen the concrete once it's poured.
The contractor is working with the on-site engineer to carefully grade the deck formwork, ensuring it matches the proper cross-slope and drainage design. A concrete deck pour is anticipated for mid-January.
After the deck is complete and while the concrete cures, crews will begin placing backfill at both bridge abutments. These activities mark another major step toward completing the bridge structure and moving closer to final roadway connections.
Important Notes for Residents:
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Traffic: Lane restrictions and temporary signals may be in place during active work hours
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Noise: Construction typically occurs during daytime hours (7 AM – 6 PM weekdays)
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Duration: Work will progress through these phases over the coming months
Project Updates
Live Cameras
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