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The Idaho Transportation Department is reconstructing and widening I-84 between the Karcher/Midland and Franklin Boulevard interchanges in Nampa.

El Departamento de Transportación de Idaho está reconstruyendo y ampliando la autopista I-84 entre los intercambios de Karcher/Midland y Franklin Boulevard en Nampa.

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Para más información y para recibir una hoja de inforamación, por favor llame 208-334-8152
Construction Update

I-84 Projects in Canyon County

Work on I-84 is in multiple stages of design and construction. Construction in 2019 and 2020 will include:

Design plans and an  environmental study are also underway for I-84 between Caldwell and Karcher/Midland.

What to expect during construction

Construction Progress Video

Click below to see a time lapse video view of the changes taking place during the I-84 widening project.

Check back for monthly updates.

Time Lapse Progress Video

Project map

Downloads & Resources

Fact SheetsAsset 4
January 2019 Open HouseAsset 4
June 2018 Open House Asset 4
I-84 Corridor FundingAsset 4
Asset 5
August 4 2019

New traffic pattern on westbound I-84 at Franklin Blvd exit.

On August 4, the Idaho Transportation Department will reconfigure lanes near the Franklin Boulevard Interchange.

In the new configuration, the left lane will no longer merge and will remain a travel lane. The far right lane will end, becoming an off-ramp to Franklin Blvd. View a map of the new traffic pattern.

The new configuration will keep two travel lanes open on I-84 during construction in Canyon County.

View a map
Asset 5

Karcher/Midland westbound off-ramp closed overnight Friday, July 26.

The off-ramp will be closed at 10 p.m. and will re-open at 7 a.m.Motorists traveling west to Karcher Rd/Midland Blvd will need to exit I-84 early at Northside Blvd and follow the posted detour signs.

Download a detour map for details.
Asset 5
July 8 2019

I-84 widening begins in Nampa

Construction began on July 8 between the Karcher/Midland and Northside interchanges. Construction will begin on July 15 between the Northside and Franklin Boulevard interchanges.

I-84 widening will begin July 8 in Nampa
Asset 5
March 2019

Karcher Overpass Construction

Construction began on the Karcher Road Overpass in March 2019.

Karcher Road Overpass Fact Sheet
Asset 5
Jan 22, 23

January 2019 Open House

ITD held public open houses to present current plans to improve I-84 in Canyon County.

Asset 5
November 18

Shoulder widening complete

The Idaho Transportation Department completed widening the shoulders on Interstate 84, clearing the way for major construction in 2019.

Asset 5
June 2018

Community Open House #2

ITD presented project plans and construction sequencing for review and comment.

Open House Displays Open House Maps
Asset 5
December 2017

Community Workshop #1

ITD held the first community workshop to present design plans and gather comments.

Workshop #1 Summary Workshop #1 PowerPoint
Asset 5
Fall 2017

Project Kick-off

ITD began design plans for I-84 widening.


Northside Blvd lane restrictions begin Monday, Nov. 4.

Lane restrictions will begin on Monday, Nov. 4 , at Northside Boulevard in Nampa.
The restrictions are in place as Intermountain Gas relocates pipes. The utility relocations are in preparation of ITD’s replacement of the Northside Interchange project.
Here’s what you can expect:
Click here for a map of the restrictions.
© Copyright 2019 Idaho Transportation Department Visit ITD Website