Quality, Service & Commitment


  • 18 Aug 2016

    Circle Interchange Flyover Project Featured in “Roads & Bridges” Magazine

  • 01 Jun 2016

    ACEC Wisconsin Awards Hoan Bridge Best of State Award for Structural Systems

  • 31 Mar 2016

    INTERRA, Inc. Celebrates 20 Years

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Our highly qualified and experienced staff is
complemented by our full-fledged State
DOT, U.S Army Corps of Engineers,
American Standard for Testing Materials
(ASTM) and American Association of State
Highway Transportation Officials (AASHTO)
accredited materials laboratories, providing
needed common and advanced laboratory
testing for soils, concrete, hot-mix asphalt
and aggregates.

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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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INTERRA is an industry leading provider of Engineering, Inspection, and Testing services delivered in support of construction, development, environmental, geotechnical projects in a wide variety of end-user markets throughout the United States.

State highway departments, federal agencies, FORTUNE® 500 companies, municipalities, top-tier healthcare corporations, preeminent construction firms, commercial property owners – to name a few – are all long-term INTERRA clients; many of which retained the firm when it opened its doors in 1996 as Great Lakes Soil & Environmental Consultants, Inc.

We believe the number and duration of our long-term clients is indicative of our consistent ability to deliver:

  • cost-effective, common-sense solutions to challenging engineering problems,
  • value-added inspection services to achieve project and owner objectives, and
  • reliable material testing data when promised to facilitate project decisions and progress.

Our clients know that INTERRA is fully committed to complete client satisfaction and that we have the  personnel, expertise, experience, systems, technology, competitive pricing, and drive to deliver just that…complete satisfaction for every client on every project.