Trempealeau County, WI

State Trunk Highway (STH) 121

Highways + Bridges
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Land Surveying
Assessments + Review
Permitting + Compliance
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Business Units
Sub Business Units

State Trunk Highway (STH) 121

STH 121 is a major state highway running through west-central Wisconsin and required a 14.75-mile upgrade between Gilmanton and Independence counties. ISG was appointed by the Wisconsin Department of Transportation (WisDOT) to lead design engineering that met WisDOT Plans, Specifications, and Estimates (PS&Es). This also included advancing PS&E requirements without a formal contract—removing extra charges to WisDOT. To meet environmental compliance standards, ISG’s in-house environmental team achieved Wisconsin Department of Natural Resources approval, documented Preliminary Concept Evaluation, conducted a Level 2 wetland delineation, and completed a Phase 2 Haz-mat report. The project reflects ISG's competence in delivering a successful WisDOT roadway improvement project that meet transportation needs and environmental standards.

  • 1-inch mill and 3.25-inch hot mix asphalt (HMA) overlay
  • Culvert replacement and repairs
  • Ditch cleaning and pavement markings
  • Wingwall replacement
  • Designs minimized right-of-way impacts
  • Applied technology and surveying equipment
  • Public involvement through meetings and informational materials

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Applied Tech