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I-84: South Jerome Interchange

Originally built in 1966, this project involves the redesign and replacement of the South Jerome Interchange.

The Idaho Transportation Department is completing plans to replace and improve the Interstate 84 South Jerome Interchange (Exit 168). The new interchange will improve safety and capacity for traffic in the area as well as replace the aging bridge and roadway.

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Spring/Summer 2017
Phase I - Value Engineering Study
Fall 2018 - Spring 2020
Phase II - Preliminary Design
Summer 2021 - Spring 2022
Phase III - Final Design
Fall 2023
Anticipated Construction


Planning for the South Jerome Interchange began in 2016 and a design alternative was chosen after two public outreach meetings and several stakeholder meetings. The unique Divided Diamond/Couplet design was picked from more than two dozen alternatives because it met project goals of improving safety, increasing traffic flow on I-84, Lincoln Avenue and the frontage roads, accommodating pedestrian and bicycle travel, and minimizing impact to neighboring properties.

After design selection, project development was delayed in 2018-20 for extensive traffic safety reviews and minor alterations.


The new interchange is designed to meet current roadway standards and traffic needs for the next 20+ years by separating and lessening the impacts of the frontage roads to the on/off ramps. Signals at the north and south ends of the interchange will sync with off-ramp signals to ensure traffic flows will be maximized and safety optimized.

The twin bridges will reduce overall bridge length, allow for widening of I-84, and will facilitate a bike lane and sidewalk in each direction. Retaining walls will be constructed along the frontage roads to reduce impact to neighboring properties. New aesthetic treatments for the interchange will be incorporated, including low-water vegetation, brick and concrete work to match City of Jerome standards, and Jerome gateway signage.


The outreach objectives throughout preliminary and final design have been to inform, educate, and solicit input from area stakeholders early and continuously with specific opportunities at key project milestones. Public meetings in 2017 and 2018 were well attended and provided support for the interchange design.

If you have any questions or concerns, or would like to be included on future distribution of project information please click on the Questions or Comments box at the top of this page, or contact ITD Project Manager, Nathan Jerke at (208) 886-7800 or [email protected].


ITD will be hosting a public meeting on Thursday, December 9, 2021. The purpose of the meeting is to unveil the final design for the interchange. The meeting will be in open house format and members of the project team will be available to speak with individuals regarding the new design and upcoming construction.

Public Meeting
December 9, 2021
4 p.m. – 7 p.m.
Jerome Council Chambers
100 East Avenue A
Jerome, ID 83338

For individuals unable to attend the meeting in person, a self-guided online meeting option will be available on this site between December 9 and December 30.

TITLE VI OF THE CIVIL RIGHTS ACT OF 1964 Persons needing an interpreter or special accommodations are urged to contact (208) 334-8567 or TTY/TDD users Dial 711 to use the Idaho Relay System.

Se les recomienda a las personas que necesiten un intérprete o arreglos especiales que llamen al coordinador de participación público al (208) 334-8567. Usuarios de
TTY/TDD: Marque 711 o (800) 377-3529 para usar el sistema de Relay de Idaho.

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