Hancock Avenue Bridge rehabilitation ensures decades of safe, reliable travel
Freeport, Illinois
SERVICES
» Topographic survey.
» Construction plans and specifications.
» Engineering design.
» Bidding.
» Construction services.
» Project and contract management.
The Hancock Avenue Bridge is an important connection to the east side of Freeport, Illinois. It has been in service for more than 70 years, carrying steady traffic across the Pecatonica River. The bridge's structure – a reinforced concrete deck supported by steel wide-flange beams – has weathered decades of wear, patch repairs and vehicle weight. The City hired Fehr Graham to study, develop conceptual plans and rehabilitate the aging bridge, preserving its role as an important City lifeline.
Our structural team inspected the Hancock Bridge in 2023. Findings showed the deck's surface was riddled with holes, and the underside showed moderate and major defects. The railing system showed that it was compromised in several locations. The Illinois Department of Transportation (IDOT) had flagged the bridge for possible replacement. Still, our team's investigation revealed that a more cost-effective option would be to create a 50-year fix to the bridge system.
Designing the future
Fehr Graham's rehabilitation plans include replacing the bridge's concrete deck and railings and structural repairs to the steel beams and abutments. Our plans widen the bridge deck from 31 feet to 33 feet, ensuring enhanced accessibility with a new 8-inch composite deck while maintaining a 5-foot-wide sidewalk on the west side. The east side parapet will be replaced with a sloped parapet, improving aesthetics and functionality.
Structural upgrades include addressing corrosion on the steel beams, particularly the diaphragm connection areas and top beam flanges. The team will clean and paint these components to extend the lifespan. Repairs to the abutments, piers and support systems will bolster the bridge's structural integrity.
Navigating challenges
The Hancock Bridge is the only access point for truck traffic in the area, presenting a challenge during construction. Fehr Graham worked closely with the City of Freeport to create plans for a temporary detour route under a nearby viaduct. To accommodate truck traffic, the City is constructing another project that will lower the roadway under the viaduct to accommodate semi and fire protection equipment.
Fehr Graham is guiding the City of Freeport through each project phase, from concept development to bidding, structural engineering, and project and construction management. Our structural team advocated for rehabilitation instead of full replacement balancing cost with long-term durability and sustainability. Rehabilitation is estimated to save the City more than $8 million.
Conclusion
When completed, the Hancock Bridge restoration will help Freeport maintain safe, reliable transportation for residents and businesses at significant savings.