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I-90, SH-41 Interchange

The Idaho Transportation Department is reconstructing the interchange at I-90 and SH-41 in Post Falls and improving SH-41 and local roads surrounding the interchange.

This project will improve safety, increase capacity, provide better connectivity to SH-41 and position I-90 for future expansion.

Construction underway

Building the interchange will take through the summer of 2025.

In 2022, you will see work along I-90. Crews will begin constructing the I-90 ramps, the new eastbound bridge, and a new temporary bridge over SH-41.

Traffic impacts start Aug. 1

What to expect

  • Two lanes will be open with reduced shoulders.
  • The speed limit will be lowered to 55 mph on I-90 and 25 mph on SH-41 and Seltice Way.
  • Intermittent lane restrictions will occur on I-90 at night.
  • Nighttime work will require lighting.
  • Construction may be noisy and dusty.
  • 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.
  • 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.

Since this video was produced during design, the Idaho Transportation Board approved a bond sale to advance this project so construction has started one year early.

Project advanced to construction in 2022

Design details

The highway will still shift to the west and pass under I-90. Ramps will meet at a single point just north of the interstate. Eastbound ramps will pass underneath the interstate to connect with the highway. The westbound off-ramp will be elongated and will not curve.

Because the interchange will be shifted north, there will be fewer impacts to the local system. The signal currently controlling the Ross Point Road, Seltice Way, SH-41 and I-90 intersection will be removed and replaced with a stop sign at Ross Point Road. After being shifted, the highway will connect with Seltice Way at Herborn Place and be controlled with a signal.

After construction, the Centennial Trail will pass underneath the interstate and continue north. A connection to the neighborhood south of Seltice Way will be constructed.

View updated design

Seltice to Mullan

Changes to the intersection include:

  • An extra through lane in each direction on SH-41
  • A raised curb on SH-41 to prevent drivers on side streets from turning left onto the highway
  • An extra left-turn lane on SH-41 to head west on Mullan Ave
  • An extra left-turn lane on Mullan Ave to head north on SH-41
Mullan Avenue design

For path users

Bike lanes will be added on both sides of Seltice Way and Mullan Avenue. A two-way cycle track will be added to the west side of Ross Point, which will also be extended further south by a future project by the City of Post Falls.

ITD will improve the intersection of the SH-41 Trail and Centennial Trail, including a new pedestrian (hawk) signal across Seltice.

A new bike path will replace the existing SH-41 bike path to provide access from the Central and Primrose intersection, as well as from the Mullan and SH-41 intersection to the south side of the interstate.

An underpass will be added for the bike path to cross under the eastbound on-ramp.

A bridge will be added for bicyclists and pedestrians to cross over the westbound off-ramp.

A second underpass will be added for the bike path to cross under SH-41.

View future path near ID-41

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.

More on TECM funding

Working

**All contact information will be kept confidential,
but all comments will be publicly visible**
Interactive Comment Map

Click on map to place comment.

View Map
Spring 2018
Early design
Fall 2018
Value planning with local stakeholders and public presentation of alternatives
Winter 2018
Preferred alternative selected
Fall 2019
Open house for planned improvements and Mullan Ave
May - June 2020
Online hearing for planned improvements and construction staging
Summer 2022
Construction underway
Summer 2025
Construction expected to be completed
July 2022

Construction underway

Most work will occur along I-90. ITD will prepare to widen I-90, begin reconstructing the I-90 ramps, and new eastbound I-90 bridges.

Work begins Aug. 1
May/June 2020

In response to public comments during May/June 2020 online hearing.

The design team reviewed comments following the May/June 2020 online hearing and developed responses to the most common concerns.

Nov. 2019

Open house

ITD held an open house to give comment on the updated interchange design, Mullan Avenue intersection and construction concepts.

Open house details
Spring 2019

Mullan Avenue added

The limits of this project were expanded to include the SH-41 and Mullan Avenue intersection--which was set to be improved within a few years after the interchange redesign--to ease construction impacts and to bring benefits to the public sooner.

January 2019

Preferred design selected

After receiving public feedback and continued discussions with the city of Post Falls, ITD has selected a new design to improve safety and capacity at the interchange. Called an offset SPUI, the latest design eliminates the loop ramp, reduces impacts to Seltice Way and achieves the efficiencies of a single-point urban interchange at a lower cost.

ITD will continue to develop details for the final design and construction.

Preferred design selected
Winter 2018/2019

Selecting an alternative

ITD is continuing coordination with local jurisdictions, and after evaluating public comments submitted after the open house, will select an alternative--whether it be the single-point urban interchange or the half-diamond interchange--to pursue. The decision will likely be made before 2019.

Fall 2018

Value Planning

ITD met with the city, planners and engineering firms to assess the needs of the project before creatively and collaboratively identifying solutions. Nine alternatives were explored by the group, and the department has selected two alternatives to present to the public at the meeting in early November.

Spring 2018

Early design

Engineers began collecting data to assess the needs of the project, ranging from traffic volumes to stakeholder identification, to develop various interchange designs.

Project
Updates

Click the arrows to the left to see all updates from early design to construction.

Frequently Asked Questions
You've got questions, we've got answers! Here are some of the most common questions we've received about this project.
General
With the planned expansion for SH-41 and the eventual expansion of I-90, will ITD build noise walls?
With the planned expansion for SH-41 and the eventual expansion of I-90, will ITD build noise walls?

Noise walls were not warranted in the analysis of the interchange, but a study is underway to look at expansion of I-90 and if it’s warranted in the corridor.

Learn more about the I-90 study.

General
With traffic detoured to the half-interchange at Seltice to the west, how will drivers access the freeway with the extra traffic? There’s no dedicated turn lane or signal right now.
With traffic detoured to the half-interchange at Seltice to the west, how will drivers access the freeway with the extra traffic? There’s no dedicated turn lane or signal right now.

Temporary signals will be installed during construction when the westbound off-ramp is closed for an extended period of time (anticipated in 2024) to handle extra traffic seeking alternative routes.

General
The underpasses and overpasses for bicyclists and pedestrians will maintain connectivity, but will they be safe?
The underpasses and overpasses for bicyclists and pedestrians will maintain connectivity, but will they be safe?

The design team consulted with other community partners like emergency services and law enforcement to mitigate any safety concerns with the construction of pedestrian underpasses. The underpasses will be well-lit and short enough to see through to maximize visibility and safety.

Both underpasses will be 14 feet wide and 10 feet tall, which makes them larger than the underpass to access Silverwood off US-95. The inside of the underpass under the I-90 westbound on-ramp will be visible from Seltice Way, and the underpass under SH-41 will be visible from Primrose Lane, which will help improve safety and ease of patrolling.

General
Once constructed, how will the new interchange affect local roads?
Once constructed, how will the new interchange affect local roads?

Modeling shows that once constructed the new interchange will be safer, more efficient and easier to navigate while being compatible with future expansion of SH-41 and I-90.

Access to businesses on SH-41 north of the interchange will remain the same, though a new median barrier will not allow left turns onto or from the highway. Access will continue to be provided primarily through side streets or signalized intersections to improve traffic flow and make it safer.

Most local roads will continue to function the same as they do now, though access to the freeway south of the interchange will be simplified. Ross Point Road will be restriped to accommodate additional street parking. Other changes to traffic control, speed limits and parking may take place after construction by the city as modifications are not supported by traffic modeling.

General
What is a Single-Point Urban Interchange (SPUI)?
What is a Single-Point Urban Interchange (SPUI)?

SPUIs control traffic at one signalized point. By using one signal, rather than two signals, to control movements, the SPUI design is expected to increase capacity and decrease travel times. This design will achieve the efficiencies of a SPUI with excellent compatibility with future expansion.

General
Why will it take four seasons to reconstruct the interchange?
Why will it take four seasons to reconstruct the interchange?

It is important to keep this interchange open to traffic during construction. If ITD could completely close the interchange, construction could occur much more quickly. This complex interchange construction project involves building significant infrastructure such as:

  • 1.3 miles of I-90 pavement reconstruction
  • SH-41 widening and pavement reconstruction from Seltice Way to 12th Ave
  • ½ mile of widening and pavement reconstruction of Seltice Way
  • Six permanent bridges
  • Two temporary bridges
  • Eight retaining walls
  • Two pedestrian underpasses
  • One pedestrian bridge
  • Upgrades to intersections with three traffic signals
  • One pedestrian (“hawk”) signal
  • Utilities, drainage, and signage improvements throughout the project limits
General
How will construction affect commuters, businesses, and bicyclist/pedestrians?
How will construction affect commuters, businesses, and bicyclist/pedestrians?

Commuters from Spokane:

  • Speed limits will be reduced, but other impacts will be minimal during commute times.

Businesses adjacent to the interchange:

  • ITD will work with businesses to maintain access and place temporary signage for construction.

Bicyclists/pedestrians:

  • ITD will maintain bicycle/pedestrian access through the construction zone. Detours will be in place whenever needed.
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