I-74 and I-155 Interchange


Kaskaskia Engineering Group, LLC (KEG) served on the project design team for the reconstruction of the of I-74/I-155 interchange near Morton, in Tazewell County, Illinois.  The proposed design consisted of the reconstruction of just over three miles of I-74 from Mueller Street Bridge to the I-74/Morton Avenue Interchange and adding a lane in each direction to provide a 6-lane interstate facility.  The project also included the reconstruction of I-155 for approximately 1 mile from south of I-74 to just north of the Illinois Route 98 interchange.  The I-74/I-155 interchange was substantially altered to reverse the existing grade separation to a proposed configuration of I-155 over I-74.     



Illinois Department of Transportation

Alfred Benesch and Company

Project Cost:
$85 Million

Anticipated 2016

KEG’s responsibilities included transportation and geotechnical services, including pavement marking, permanent signing, traffic signals for two intersections, and subsurface soil and foundation recommendations for pavements and structure foundations.  KEG provided the temporary and permanent erosion control design necessary to accommodate the complex Maintenance of Traffic (MOT) plan that was required to maintain traffic movements during the reconstruction and realignment of the I-74/I-155 interchange.


Pavement coring and signing concepts were provided by KEG early in the planning phases in order to expedite the permanent signing, signals, and pavement markings during plan preparation.  The geotechnical services included over 100 borings and 40 Dynamic Cone Penetrometer tests, as specified by IDOT.  A revised Roadway Geotechnical Report (RGR) for the project was completed by KEG, incorporating subsurface information previously performed by IDOT, in addition to subsurface information obtained to more recent specifications.  The RGR required a detailed subsurface soil profile along the entire alignment based on a combination of the historical and new data.  Additional geotechnical work included two Structural Geotechnical Report Addendums to address issues and/or changes to the structure design since completion of the original Structural Geotechnical Reports by IDOT and others.  KEG also evaluated the structural impact of temporary embankment fills adjacent to existing bridge support structures during various MOT stages.     


The project was on the November, 2012 letting with construction beginning in the spring of 2013. KEG also assisted with construction engineering during this phase of this project.





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