Quality, Service & Commitment


  • 22 Jan 2018

    Civil Engineer Needed

  • 08 Dec 2017

    INTERRA Honored With 2017 IRTBA Green Industry Achievement Award For Green Initiatives

  • 26 Oct 2017

    INTERRA To Host Ribbon Cutting With Bolingbrook Mayor Celebrating Going Green

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Laboratory Certifications

  • IL & WI State DOTs
  • ASTM


Firm Certifications

  • DBE with IDOT
  • MBE with City of Chicago

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Chicago O’Hare Airport, Terminal 6 Project: “We would like to extend our appreciation to you and all of your employees who worked on the Terminal 6 Project.  All work was performed professionally, accurately and thoroughly. Your commitment to quality and …

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Dan Ryan Expressway Reconstruction – Illinois DOT

INTERRA Services

  • Monitoring and documentation of construction activities
  • Materials coordination
  • Geotechnical inspection and testing
  • Concrete plant and field inspections
  • Hot-Mix Asphalt (HMA) plant and field inspections
  • Comprehensive environmental investigation for the North and Southbound express lanes, developing site environmental plans
  • Locating and drilling approximately 500 boreholes for environmental samples, sample collection
  • Analyses of sample test results and delineation of non-special waste, oversight of non-special waste removal and report preparation

Project Summary

INTERRA provided construction inspection, management and materials (QC/QA) services for the reconstruction of the $725 million  Dan Ryan Expressway  reconstruction project for the full duration from 2004 to 2007. The Illinois Department of Transportation (IDOT) reconstructed the Dan Ryan Expressway between 31st and the I-57 Interchange. The vastly improved expressway included an additional lane in each direction, a reconfigured skyway interchange, and significant enhancements to the local access roads that run parallel to the expressway.

As a member of the project team, INTERRA contributed its expertise, and inspection and testing services to help ensure that this highly complex, long-term project was completed on schedule, with minimum disruption to one of the highest volume routes into and out of the City of Chicago.