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ITD is making plans to improve I-84 between Caldwell and the Karcher Interchange. Work in this area is in multiple stages of study and design.

El Departamento de transportación de Idaho está haciendo planes para mejorar el Interestatal 84 entre Caldwell y el intercambio de Karcher. El trabajo en esta área se encuentra en multiples etapas de estudio y diseño.

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I-84 in Canyon County
I-84 OverviewAsset 2
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Environmental study and traffic analysis

The Idaho Transportation Department is conducting a traffic study and environmental analysis for I-84 between Caldwell and the Karcher Interchange in Nampa. This is part of a plan to invest more than $300 million into I-84 in Canyon County over the next several years.

The study will include evaluating several potential improvements, including additional lanes on I-84 and improvements to existing interchanges.

ITD will consider potential impacts to adjacent properties, minority populations, noise, floodplains, wetlands and many other factors. Public input is a key element of the study.

Design plans

The Federal Highway Administration has accepted a proposal from ITD to look at the I-84, Caldwell to Karcher environmental document in smaller parts. This allows ITD to advance the section of I-84 between Franklin Road and Karcher Road.

Traffic study

Outcomes of the traffic study will help ITD identify needed improvements and confirm how far west into Caldwell the improvements need to be made.

View Traffic Study Maps
Rear-end crash statistic

Funding

ITD has allocated more than $300 million in state, federal and GARVEE funds to improve I-84 in Canyon County. $150 million of this funding has been allocated to the section of I-84 between Caldwell and the Karcher Interchange in Nampa.

This funding will cover the environmental study and traffic analysis for the entire corridor. It also will cover design and construction between Franklin Road and Karcher. Additional funding will be needed to design and construct the improvements west of Franklin Road.

Downloads & Resources

Fact SheetAsset 4
January 2019 Open HousesAsset 4
June 2018 Open House DisplaysAsset 4
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Asset 5
Jan. 22, 23

January 2019 Open House

ITD held open houses on January 22 and 23 to review and comment on the plans to widen I-84 from Franklin Road Interchange in Caldwell and the Karcher Interchange in Nampa.

Asset 5
June 2018

Community Open House

ITD held community open houses on June 26, 27 and 28 to identify issues and needs to be addressed in the study.

Open house displays Open house maps
Asset 5
Late 2017

Project Kickoff

ITD began conducting a traffic study and environmental analysis.

Project
Updates

What is happening now?

The Federal Highway Administration accepted a proposal from ITD to look at the I-84, Caldwell to Karcher environmental document in smaller parts. This allows ITD to advance the section of I-84 between Franklin Road and Karcher Road.

What is next?

ITD will move forward with design work between Franklin Road and Karcher Road. West of Franklin Road, ITD will continue working on the environmental study. The public will have an opportunity to comment on ITD’s progress at an open house this summer.

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