TERRA Engineering provided Phase I and Phase II Engineering Services for the replacement of the bridge structure carrying IL Route 9 over Mud Creek in Tazewell County, Illinois. For Phase I, TERRA completed data collection, topographic and right of way surveys, hydraulic modeling, geotechnical reports, and traffic management analysis. During these studies, it was discovered that an abandoned railroad bridge just upstream from the IL Route 9 structure was restricting the flow of the creek, causing diversion of flow well outside its natural floodway. To address this, TERRA proposed the abandoned railroad structure be demolished to provide an optimal hydraulic location for the new bridge structure. The improved hydraulic efficiency minimized the required bridge length and mitigated the need to raise the structure profile, which in turn provided the client with the most cost effective solution

Design of the bridge was completed in Spring 2012 and construction will begin shortly.


Terra was the prime for this job.