Quality, Service & Commitment


  • 21 Jul 2017

    Recipient Of Service Award Thanks INTERRA for Engineering Support With Jane Byrne Circle Interchange

  • 15 Mar 2017

    INTERRA, Inc. Full-Time Field Technician Openings in Franklin, WI

  • 26 Sep 2016

    INTERRA Supports the Safe Roads Amendment

More News


Laboratory Certifications

  • IL & WI State DOTs
  • ASTM


Firm Certifications

  • DBE with IDOT
  • MBE with City of Chicago

Read More


With this letter we provide our confidence in INTERRA in providing comprehensive field and laboratory testing for projects involving soils investigations, design and construction monitoring … Their services are consistently ontime and within budget…

Read More


Since the firm’s founding in 1996, INTERRA (then Great Lakes Soil & Environmental Consultants, Inc.) has been retained by departments of transportation (DOT) and transportation agencies in numerous states.  INTERRA is routinely selected to provide its expertise and services on demanding interstate highway projects because it just doesn’t fail to deliver what’s expected.  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.

As can be seen in the following project profiles, INTERRA’s DOT 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.