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I-84, Jerome to Twin Falls

The Idaho Transportation Department is designing improvements along 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 increase substantially over the next 20 years. The purpose of this project is to increase capacity and improve safety on I-84.

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Project Overview

ITD is currently designing improvements to I-84 between the South Jerome Interchange (exit 168) and the Twin Falls Interchange (exit 173). This project is part of Idaho Governor Brad Little’s “Leading Idaho” transportation funding solution.

Improvements include:

  • Adding a third travel lane in both directions
  • Replacing the 400 S Road Bridges
  • Constructing drainage facilities for the increased pavement surface.

These improvements will tie in to the design plans currently in process for the Jerome Interchange.


ITD anticipates that design for the improvements will be completed by late 2022.

Once funding has been identified, construction can start as early as 2023.

Community Input

ITD will host an in-person and virtual public meeting in Summer 2022.

This meeting will provide the public an opportunity to review design plans and provide input.

Notification for this meeting will be sent out in early Summer 2022. Sign up for project email updates to stay informed.

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Leading Idaho

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.

More on TECM funding
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