Thank you!
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Constructing the SPUI to increase capacity and decrease travel times.
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Widening I-90 to allow for future expansion.
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Upgrading bike and pedestrian facilities to enhance connectivity at the interchange.
Overview
The Idaho Transportation Department reconstructed the interchange at Interstate 90 and State Highway 41 in Post Falls. This project will improve safety, increase capacity, provide better connectivity to SH-41 and position I-90 for future expansion.
The new interchange will feature a single point urban interchange (SPUI) where all ramps will converge at a single point controlled by a traffic signal. Upgrades to the interchange include replacing existing bridges, building new bridges, re-aligning on- and off-ramps, and improvements to the SH-41 trail and Centennial Trail which will provide safer travel options for pedestrians and cyclists.
Construction began in 2022 and was completed in October 2026.
I-90/SH-41 Project Update!
See all the work that went into constructing the SPUI over the past four years!
Work included:
- Building the new westbound off-ramp at SH-41.
- Building the new SPUI operation.
- Widening SH-41 to Mullan Avenue.
- Finishing the SH-41/Mullan Avenue intersection.
Traffic Impacts During Construction Included:
- Crews working Monday-Friday from 7 a.m. to 5 p.m.
- Night work scheduled from 8 p.m. to 5 a.m. During special events, night work began at 10 p.m.
- The speed limit was 55 mph on I-90 and 25 mph on SH-41 and Seltice Way.
- Lane restrictions on SH-41.
- Mullan Ave. was restricted to one lane in each direction.
- Intermittent lane restrictions occured on I-90 at night.
- Nighttime work required lighting.
- Construction was noisy and dusty at times.
- For live traffic impacts, check 511.idaho.gov.
Fly over the design
Skip the reading, and watch this 6-minute video on how the new interchange will look and function.
Note: After this video was produced, the Idaho Transportation Board approved a bond sale to advance this project to construction one year early.
Funding
The Idaho Transportation Board approved a bond sale in February 2022 to advance the project to start construction one year early.
Elements of this project are being funded with the 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 project was awarded to Scarsella Brothers, Inc. for $78 million.
Timeline
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Spring 2018
Early design
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Fall 2018
Value planning with local stakeholders and public meeting to present alternatives
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Winter 2018
Preferred alternative selected
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Fall 2019
Open house
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May-June 2020
Online hearing for planned improvements and construction staging
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2022-2025
Construction underway
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Fall 2026
Construction completed!
Frequently Asked Questions
You've got questions, we've got answers! Click here for some of the most common questions we've received about the project.
Downloads & Resources
Contact
I-90/SH-41 Project Team
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