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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connection between Interstate 5 and Highway 99 carries thousands of vehicles daily but features narrow lanes and an outdated design that poses safety hazards.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

Maintained vital transportation link between I-5 and US-99

Timeline

Project Updates

Construction Schedule October-November 2025

* Schedule subject to change

End of October - November

Throughout October, construction crews continue working on the new Hills Ferry Bridge. Currently, carpenters are shaping the soffit (the bottom of the bridge) and girder stem sections, while ironworkers are laying out and tying the reinforcement. Additional surveying crews are collaborating with the Contractor to grade and adjust the falsework system, which will temporarily support the bridge during the upcoming concrete pour for the stem and soffit, expected in late November.

These operations represent a key stage in completing the bridge superstructure and will proceed through the end of the month.

Important Notes for Residents:

Traffic: Lane restrictions and temporary signals may be in place during active work hours
Noise: Construction typically occurs during daytime hours (7 AM - 6 PM weekdays)
Duration: Work will progress through these phases over the coming months