The Idaho Transportation Department is widening I-84 between the South Jerome Interchange and the Twin Falls Interchange. I-84 serves as a major corridor through south-central Idaho and beyond, with traffic counts expected to double over the next 20 years. These improvements will increase capacity and improve safety on I-84 to serve the region for years to come.
Work will begin April 2023 and be completed in late fall 2025. This year, construction crews will build the new lanes and median wall on I-84. In addition, work will begin at the 400 South Road Bridge to accommodate the widening of I-84.
This project is being funded with Transportation Expansion and Congestion Mitigation (TECM) funds as part of the Leading Idaho TECM Program. The program allows ITD to accelerate project timelines to address rapid growth and build critical infrastructure today that would otherwise take many years to fund and build.
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ITD repaved I-84 between Exit 168 and Exit 173 in 2019 and 2020. This work was to rebuild and strengthen existing pavement. The repaving of I-84 was part of regularly scheduled maintenance work on I-84.
ITD will be utilizing as much of the new pavement as possible in the expansion of I-84.
This project is being funded Transportation Expansion and Congestion Mitigation (TECM) funds as part of the Leading Idaho TECM Program. The program allows ITD to address rapid growth and aging infrastructure in critical corridors throughout the state.
Construction begins in April 2023 and is anticipated to be completed in late Fall 2025.
The bridges need to be replaced to accommodate the additional lanes on I-84. The bridges will also be raised to provide more vertical clearance for vehicles on I-84.
Improvements to interchanges will not be included in this project. Improvements being made to the South Jerome Interchange are part of a separate project. Plans for the two projects will be coordinated.
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