Quality, Service & Commitment


  • 26 Oct 2017

    INTERRA To Host Ribbon Cutting With Bolingbrook Mayor Celebrating Going Green

  • 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

More News


Laboratory Certifications

  • IL & WI State DOTs
  • ASTM


Firm Certifications

  • DBE with IDOT
  • MBE with City of Chicago

Read More


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 …

Read More

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.