Overview
The I-90 and US-95 Interchange project is the first interchange to emerge from the I-90 Corridor Study.
The goal of the proposed design is to expand the interchange, enhance safety, and improve mobility to support future traffic volumes, which are expected to double by 2045.
Proposed Improvements
- New single-point urban interchange (SPUI) at I-90 and US-95
- Interchange ramp improvements at 4th Street
- I-90 widening from US-95 to 4th Street
- US-95 widening from Emma Avenue to Bosanko Avenue
- US-95 will be elevated on a bridge, and Appleway Avenue will be lowered so that the two roads are grade separated and no longer intersect
- Intersection improvements on:
- US-95, from Emma Avenue to Neider Avenue
- 4th Street, at the westbound I-90 ramps and Appleway/Best Avenue
- Northwest Boulevard, at the westbound I-90 ramps and Appleway Avenue
- Bicycle and pedestrian improvements along I-90 and US-95
Public Involvement
Since 2021, several open houses, surveys, meetings with interested parties, and other public involvement opportunities took place as part of the I-90 Corridor Study. The feedback gathered during those efforts has helped shape the proposed design for the I-90, US-95 Interchange project.
ITD held the first open house for this project in spring 2025 to showcase the proposed design, visual examples of key sections, and meet with the public to answer questions and gather feedback. The project team is updated the proposed design based on feedback from the public and presented this revised design at an open house in winter 2025. A final open house will be held in fall 2026 to present an even more detailed design.
Questions or comments may be directed to the project team at info@i90corridor.com or via phone at (208) 738-4190.
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Funding
The I-90, US-95 Interchange design is being funded with Transportation Expansion and Congestion Mitigation (TECM) funds as part of Governor Little’s Leading Idaho initiative. 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. The corridor is one of 13 approved TECM corridors in the state. Funding for the I-90, US-95 Interchange construction and for future I-90 projects between SH-41 to 15th Street has not been identified but will be determined based on project readiness and funding availability.
Preliminary estimates value the improvements between SH-41 to 15th Street at $810 million to $860 million, which includes design, property purchase, and construction costs. ITD has already funded approximately $250 million in costs associated with the I-90 corridor study, the I-90 widening projects from SH-41 to US-95, and the I-90, US-95 Interchange design. Work to fund, design, and construct the remaining portions of the corridor will be completed in stages over many years.
Contact the project team
For questions or comments about this project, please contact the project team at info@i90corridor.com or (208) 738-4190.
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Resources
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This link will take you to a virtual rendition of all the materials and information presented to the public at the November 2025 public meeting for this project.