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ID-41: Mullan to Prairie

An expanded highway will help meet the growing traffic demands on this highly-used corridor between Rathdrum and Post Falls.

The highway will be expanded to four lanes divided by a 50-foot median where possible. Depending on the location, intersection improvements will add capacity, provide signalization or limit certain movements to facilitate mobility through the whole corridor. A path will be constructed to the east of the highway.

Intersection changes

Two new signals at 16th and Hope avenues will be installed, with necessary right and left turn lanes added to their current configurations.

Both Poleline and Prairie avenues will feature dual left turn lanes onto the highway. Right turn lanes will be added at Poleline Avenue to head south or north on the highway, and Prairie Avenue will feature a right turn lane for both directions on ID-41. There will also be two dedicated through lanes at the intersection for traffic on Prairie Avenue.

Non-signalized intersections

After construction, movements at non-signalized intersections will be guided by small, curbed medians. Drivers on the highway will be able to turn right or left across traffic, but drivers on the side street will only be able to turn right onto the highway. Drivers on side streets will be able to make U-turns at the nearest signal to change directions or to access businesses on the other side of the highway.

Although drivers will be able to use new left turn lanes on the highway to access 12th Avenue,  a curbed median will only allow right turns onto the highway after construction.

Mullan intersection

Several projects will tie into the Mullan intersection, but major changes aren’t planned for it until the nearby interchange is reconstructed.

Learn about future Mullan intersection

Corridor construction

All work to expand ID-41 is planned for completion in 2022.

The existing highway will essentially become the southbound lanes of the new highway, allowing much of the work to be constructed with minimal impact.

Once work starts, traffic will continue to run on the current lanes while two new lanes and the railroad overpass are built to the east. Once those lanes are finished, traffic will be moved onto that section while the old section is reconstructed.

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Download fact sheet
May 2021

First railroad overpass opens

The first of two bridges over the railroad will open May 14. Work on the overpass began in June of 2020 and completing this structure is a major milestone in the effort to expand the highway to four lanes between Post Falls and Rathdrum.

Read more
June 2020

Expansion begins

Over the next three years, new lanes will be added to the east of the existing lanes, along with a wide path for bicyclists and pedestrians.

Expansion begins


With the onset of snow and winter temperatures in November 2021, most of the work for the season has been completed. Miscellaneous tasks will continue over the winter, including the installment of new signals, which will require nighttime closures that will be communicated via 511 and email updates. Next year is scheduled to be the last season of work.

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ID-41: Prairie to Lancaster

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