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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LPV111, New Orleans East Back Levee, Louisiana: “Given the accelerated schedule requirements of this project both the testing lab & field staff were more than capable and willing to go the extra mile to ensure all manners of testing specifications …

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Since the firm’s founding in 1996, INTERRA (then Great Lakes Soil & Environmental Consultants, Inc.) has provided services to the Illinois Department of Transportation (IDOT), Illinois State Toll Highway Authority (ISTHA), and various counties and municipalities. INTERRA is selected to provide expertise and services on demanding interstate highway projects because INTERRA delivers.  Our wide array of services, consistent field personnel, and ability to provide sample data in near real-time upon test completion is a value-added benefit state agencies and construction teams rely on to make decisions to move the project forward.

INTERRA has provided various services for several years with the EOWA Project.

As can be seen in the following project profiles, INTERRA’s services have included monitoring and documentation of construction activities, materials coordination, geotechnical inspection and testing, and concrete and hot-mix asphalt plant and field inspections.