Towerline Road (CH-11) Bridge over the Mackinaw River

This structure was originally built in 1967 and time had taken its toll on the 453’ long four-span steel girder bridge. Tazewell County needed a timely and cost-effective solution to rehabilitate this large structure.

Our team completed all Phase I and II tasks necessary for the rehabilitation of this bridge. We developed a plan focused on improving the bridge’s load capacity and lifespan while minimizing cost. The rehabilitated bridge will be 30.0’’ wide and 453’ long with 126’ main spans over the Mackinaw River.

Major improvements to the bridge include a new concrete deck, making the steel beams composite to increase their load capacity, steel beam repairs, cleaning and painting the steel beams, new expansion bearings at the abutments, substructure repairs, and adding riprap at the abutments. Roadway improvements include improved side-slopes and up-to-date guardrail.

Scope of Work 

• Funding documentation
• Project Development Report
• Bridge Condition Report
• Preliminary bridge design and scour analysis
• Type, Size, and Location (TS&L) plans
• Environmental coordination
• Roadway and structure plans
• Traffic control plans
• Specifications
• Cost estimates
• Shop drawing review
• Coordination with regulatory and permitting agencies including the Illinois Department of Transportation, Illinois Department of Natural Resources, and Illinois Environmental Protection Agency