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I-90, ID-41 Interchange

Traffic volumes continue to grow, prompting the redesign of the interchange to safely accommodate more drivers.

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CommentAsset 2
Online meeting
May 28 to June 18

Welcome

Until June 18, move between the stations to learn about and comment on this project. Visit Station 1 for the schedule, crash data and projected traffic volumes; Station 2 for graphics of the interchange; Station 3 for graphics of facilities for pedestrians and bicyclists; Station 4 for graphics of the new Mullan intersection and impacts to local roads south of the interchange; and Station 5 for anticipated construction impacts.

Don't forget the project team is available to answer any questions via the form on this website, emailing shannon.stein@itd.idaho.gov, calling (855) 785-2499 or sending mail to 600 West Prairie Avenue, CDA, ID 83814. Look for the give comment option near the top of the page or after each station.


Station 1: Overview

Watch to review the background and history of this project, with details on crash data, traffic volumes and the schedule.

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Station 2: Interchange Design

Go over the updated design for the interchange.

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Fly over the design

See what the new design for the interchange will look like, then continue on to the next three stations.

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Station 3: Bike and Pedestrian Facilities

Learn about the new bike and pedestrian facilities.

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Station 4: Mullan Avenue and local roads

Get a close-up look at the new Mullan intersection and impacts to local roads like Ross Point.

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Station 5: Construction

Hear the details about timing and impacts.

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Thank you and next steps

Check out all the ways you can comment until June 18: via the comment form on this website, emailing shannon.stein@itd.idaho.gov, calling (855) 785-2499 or sending mail to 600 West Prairie Avenue, CDA, ID 83814.

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Spring 2018
Early design
Asset 5
Fall 2018
Value planning with local stakeholders and public presentation of alternatives
Asset 5
Winter 2018
Preferred alternative selected
Asset 5
Fall 2019
Open house for planned improvements and Mullan Ave
Asset 5
Spring 2020
Online hearing for planned improvements and construction staging
Asset 5
Spring 2023
Anticipated start construction
Asset 5

Downloads & Resources

Asset 5
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
Asset 5
Spring 2019

Mullan Avenue added

The limits of this project were expanded to include the ID-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.

Asset 5
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
Asset 5
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.

Asset 5
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.

Asset 5
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

In response to public comments received at the Nov. 2019 open house, ITD published a FAQ. Read more.

 

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
How will the new design be compatible with other regional places?
How will the new design be compatible with other regional places?

The new interchange was designed to accommodate future traffic demands and to be compatible with other regional plans.

Future growth was modeled by pulling data from several sources, including: employment rates from the Department of Labor, structure data from Kootenai County, the 2010 national census, planned transportation projects and land use development as projected by cities in Kootenai County. Modeling supports the current design’s compatibility with expansion of ID-41 to three lanes and expansion of I-90 to six lanes. The base model was provided by Kootenai Metropolitan Planning Organization and used by the design team to evaluate how the project will perform with existing and future conditions.

Although not included in this project, ITD is seeking grant funds to relocate the Port of Entry to Huetter to minimize safety concerns posed by commercial traffic heading east through the interchange and up the grade.

General
Are there any other interchanges planned for I-90 in Post Falls?
Are there any other interchanges planned for I-90 in Post Falls?

Existing interchanges in Post Falls are too close together to allow the construction of additional interchanges. Current standards call for interchanges to be spaced at least one mile apart to reduce conflicts between traffic merging onto the freeway and other traffic weaving to exit. As it is, there are no other city routes capable of handling traffic accessing the interstate.

There are no other plans to modify interchanges in Post Falls, though transportation plans have long identified the need for an additional north-south route at Huetter to relieve pressure on ID-41 and US-95. The design of the ID-41 interchange will allow for ramps at Huetter, but at this time there is no funding to expand that route.

General
Will any overpasses be included for pedestrian use?
Will any overpasses be included for pedestrian use?

ITD is considering a combination of tunnels, overpasses and crosswalks to safely move pedestrians and bicyclists through the interchange. Both costs and benefits will be evaluated, with more details shared at the next open house.

General
How will construction affect other regional traffic?
How will construction affect other regional traffic?

Redesigning the interchange is expected to take at least two years. Any lane closures on I-90 will be scheduled at night, though drivers should expect congestion at other interchanges in Post Falls.

ITD is in the process of identifying staging plans for construction, which will detail detour routes and could include changes to the signal timing at other on-and-off ramps to handle extra traffic. The design team, which includes the City of Post Falls and Kootenai County, will present options to minimize ramp closures and maintain mobility at the next open house in the spring. Options will not include the construction of other ramps as existing ramps do not have enough room between them to make this safe.

General
With only one lane for the eastbound off-ramp, will traffic back up onto the freeway if there is a crash?
With only one lane for the eastbound off-ramp, will traffic back up onto the freeway if there is a crash?

Although the ramp will only be striped for one lane, it will have wide shoulders to keep traffic moving around most crashes as well as to provide room for staging during construction and future maintenance operations. ITD will also use signage to redirect traffic around crashes at that ramp, as it does now by changing messages at signs located near the state line. Another digital emergency sign will be placed on eastbound I-90 near Greensferry with this project.

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 ID-41 and I-90.

Access to businesses on ID-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 limited and parking may take place after construction by the city as modifications are not supported by traffic modeling.

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