I-90 SH-41 Interchange

I-90 Ramp and Lane Closures Starting July 6

Starting Monday (July 6), there will be multiple overnight ramp and lane closures on I-90. These closures will allow crews to continue paving operations at the I-90/SH-41 Interchange.

WHAT TO EXPECT:

Monday (July 6):

I-90/SH-41 eastbound off-ramp closed from 8 p.m. to 5 a.m. See detour map.

Wednesday (July 8):

I-90/SH-41 westbound on and off-ramp closed from 8 p.m. to 5 a.m. See detour map.

Thursday (July 9):

I-90/SH-41 eastbound off-ramp closed from 8 p.m. to 5 a.m. See detour map.

For more information!

Overview

The Idaho Transportation Department is reconstructing 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 is expected to be complete in 2026.

Traffic Impact Update

Work will include:

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.

What to expect in 2026:

Crews will work Monday-Friday from 7 a.m. to 5 p.m.
Night work will be scheduled from 8 p.m. to 5 a.m. During special events, night work will begin at 10 p.m.
The speed limit is 55 mph on I-90 and 25 mph on SH-41 and Seltice Way.
Lane restrictions on SH-41.
Mullan Ave. will be restricted to one lane in each direction.
Intermittent lane restrictions will occur on I-90 at night.
Nighttime work will require lighting.
Construction may be noisy and dusty.
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

Spring 2018

Early design
Fall 2018

Value planning with local stakeholders and public meeting to present alternatives
Winter 2018

Preferred alternative selected
Fall 2019

Open house
May-June 2020

Online hearing for planned improvements and construction staging
2022-2025

Construction underway
2026

Construction expected to be completed