I-94 & I-69 Interchange Reconstruction

Port Huron Township, St. Clair County, Michigan

The Michigan Department of Transportation reconstructed 3.7 miles of the I-94/I-69 interchange in Port Huron Township, St. Clair County, replacing bridges and reconstructing ramps. G2 Consulting Group and Toebe Construction teamed up to complete this $76 million project, maximizing construction efficiency and minimizing construction cost – while protecting nearby residences.

Fast Facts

Project Owner

Michigan Department of Transportation


3.7 miles of interstate, replacing bridges and reconstructing ramps

G2 Services Provided

Geotechnical engineering
Remote instrumentation monitoring settlement and vibration
Value engineering


      • The construction schedule was contingent on embankment soils settling. The team installed 12 vibrating wire piezometers to monitor pore water pressure changes as the embankments were constructed. In addition, a new innovative settlement cell system was used to monitor actual settlement of embankment soils to signal when bridge construction could proceed. This approach shortened the specified six-month waiting period by one month.
      •  Project budget was tight. Prior to starting, G2 recommended Elastizell as a more cost effective light weight fill in place of the polystyrene block that was proposed in the design, simplifying installation and reducing material costs. G2 also worked with Toebe Construction to optimize equipment efficiency and reduce construction costs, particularly during installation of piles, using static load tests and PDA testing to confirm design capacities for the piles.
      • Nearby residential structures were protected by specifying the maximum vibration levels allowed during construction. G2 then implemented remote vibration units to monitor vibration continually – without needing a field engineer on site – providing critical data while minimizing costs.

Smart. Results. Fast. G2 provided geotechnical solutions to protect  nearby residences and provide adequate support for the roadway and embankments, while shortening the project schedule and reducing costs.

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