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I-15 Fort Hall Interchange

The new interchange design will serve the Fort Hall community and the traveling public for many years.

ITD is working with the Shoshone-Bannock Tribes, the local community and the public to design a new interchange at Exit 80 (Fort Hall) on Interstate 15.

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Project Details

Exit 80 (the Fort Hall Interchange) is the primary entrance into the Fort Hall community from Interstate 15. The current interchange was constructed in 1958.

The new interchange design will include:

  • Two lanes in either direction with a center lane on the bridge over I-15 (Simplot Rd.)
  • Longer and wider interchange ramps
  • A six-foot shoulder for safer pedestrian and bicycle crossing
  • Six new bridges over Ross Fork Creek and the Town Lateral Canal
  • Improved lighting and landscaping
  • Improved irrigation and cattle guards

Project Updates

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May 2018

Community Open House

ITD held a community open house in May 2018 to share its preliminary design plans and receive public feedback.

Open House Displays
Summer 2018

Final Design Preparation

The working group reviewed public feedback on preliminary design plans from the community.

Fall 2019

Final Community Open House

Final design to be completed and presented to the community later this fall.


August 14, 2023

Beginning tonight the first girder placement will be done. The next girder placements will be on 8/16, 8/21, and 8/23.

April 7, 2023

Contractor Sundt-Cannon is currently finishing the culverts under the northbound road at Ross Fork Creek and Town Lateral. Once this is complete, they will move the traffic currently on the detour back to the northbound lanes. This is set to occur April 10th at night.

Once the traffic has been moved back to the northbound lanes, Sundt-Cannon will work to complete the tie-ins to the crossover on the southbound side. When completed, the southbound traffic will be moved on to the median detour lanes. This is set to occur April 17th at night.

December 13, 2022

Construction crews are beginning clearing and grubbing work in the median for the median detour. They are also working on driving piles for temporary shoring at Ross Fork Creek.

Motorists should carefully follow signs and posted speed limits while travelling through the construction area. Motorists should also be aware of trucks entering the highway from the median at lower speeds. Drivers are encouraged to check or the 511 app to keep track of road conditions and construction.

Open house 

ITD will host an open house at the Shoshone-Bannock Casino Hotel on May 15, 2019 to share final design plans for the new interchange. Please drop in anytime between 4 and 6 p.m. to speak with project staff, review plans and give comments.


Fall 2017
Hold working group meetings with ITD and the Shoshone-Bannock Tribes
Spring 2018
Prepare preliminary design plans. Host working group meetings with ITD and the Shoshone-Bannock Tribes
Summer 2018
Host community open house to gather input on preliminary design plans
Fall 2018 - Winter 2019
Review input and prepare final design plans
Spring 2019
Host community open house to gather input on final design plans
Summer 2022
Construction funding anticipated; begin construction
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