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I-84, Jerome to Twin Falls

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.

What to expect in 2023

  • I-84 will be restricted to one lane in each direction at night. Occasional daytime lane restrictions may be necessary.
    • Rolling closures on I-84 will occur this spring/summer for blasting rock in the median.
  • Traffic shifts will be used throughout construction.
  • The speed limit on I-84 will be reduced.
  • 400 South Road will be closed intermittently.

Project Overview

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.

Improvements include:

  • Widening I-84 to three lanes in each direction.
  • Placing a concrete overlay on existing pavement.
  • Reconstructing the 400 South Road bridge.

 

These improvements will be coordinated with plans to improve the Jerome Interchange.

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.

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Frequently Asked Questions
Here are some of the most common questions we've received about this project.
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General
When was the last time ITD made improvements on I-84 between Jerome and Twin Falls?
When was the last time ITD made improvements on I-84 between Jerome and Twin Falls?

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.

General
What will happen to the pavement recently placed on this section of I-84?
What will happen to the pavement recently placed on this section of I-84?

ITD will be utilizing as much of the new pavement as possible in the expansion of I-84.

General
How is this project being funded?
How is this project being funded?

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.

General
When will construction begin?
When will construction begin?

Construction begins in April 2023 and is anticipated to be completed in late Fall 2025.

General
Why is ITD reconstructing the bridges over 400 S Road?
Why is ITD reconstructing the bridges over 400 S Road?

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.

General
Will ITD make improvements to the interchanges?
Will ITD make improvements to the interchanges?

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.

General
How can I sign up for updates?
How can I sign up for updates?
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