This project was previously funded for construction in 2032. As a result of recent changes in transportation funding, this project has had its funding removed to prioritize other projects necessary to the operation and preservation of the transportation network.
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Project Overview
Use of US-91 has increased in recent years, and ITD is developing plans that will accommodate continued growth in the area.
The purpose of this project is to expand US-91 to improve safety and mobility to serve the area’s increasing population and travel demands. The project begins at Siphon Road and ends at Reservation Road in Chubbuck.
Anticipated Improvements
Improvements to US-91 between Siphon Road and Reservation Road are being designed using environmental studies, technical data and input from the public.
The project team is evaluating improvements to widen US-91 to five lanes between Siphon Road and Tyhee Road. This design would accommodate two lanes in each direction and a two-way left-turn lane in the center of US-91.
At the US-91/Tyhee Road intersection, the project team is evaluating improvements to:
- Add a right turn bay for northbound US-91 traffic turning onto Tyhee Road.
- Add left-turn bays for eastbound and westbound Tyhee Road traffic turning onto US-91.
The project team is evaluating improvements to widen US-91 to three lanes between Tyhee Road and Dallin Drive. This design would accommodate one lane in each direction and a two-way left-turn lane in the center of US-91.
Dallin Drive and Reservation Road, the project team is plans to resurface US-91.
Public Involvement
Public involvement is a vital part of the US-91 Siphon Road to Reservation Road project. The project team hosted a public meeting in March 2025 to introduce the project and collect feedback about preliminary design plans.
Over 800 community members participated in the in-person and online meetings. Several participants submitted comments supporting project plans and a few recommended that ITD widen US-91 between Tyhee Road and Reservation Road.
The project team plans to share final design plans with the community at another public meeting in 2027.
Timeline
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2024-2025
Gathered technical data and environmental information, developed preliminary improvement plans
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2025
Hosted a public meeting to share preliminary design plans and gather input
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2026-2027
Developing final improvement plans
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2027
Host a public meeting to share updated project plans and gather input
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2027-2028
Finalize design plans
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Construction is not funded at this time
Construct improvements (depending on the availability of funding)
Frequently Asked Questions
US-91 is a major roadway for the Pocatello, Chubbuck and Fort Hall communities. Traffic counts continue to increase as the population in eastern Idaho grows, and US-91 is nearing capacity. It is necessary to increase safety and capacity along this roadway to continue to meet the area’s travel needs.
During this project, ITD plans to develop improvements that will improve safety and capacity on US-91 between Siphon Road and Reservation Road. The project team is currently evaluating what improvements would best accomplish these goals.
The preliminary design of this project was completed in 2025, and final design is expected to be completed in 2028. The beginning of construction is dependent on the availability of funding.