Overview
Construction began to replace the South Jerome Interchange in 2024. Crews are currently working on the southbound Lincoln Avenue bridge and the eastbound off-ramp. Construction is anticipated to be completed in late 2026.
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E Frontage Road N partially closed just east of Lincoln Avenue
The westbound lane of E Frontage Road N just east of Lincoln Avenue is closed until mid-July.
This closure will allow crews to complete concrete work and connect E Frontage Road N to Lincoln Avenue.
What to expect:
- E Frontage Road N will be partially closed just east of Lincoln Avenue
- Motorists traveling eastbound will have access to E Frontage Road N from Lincoln Avenue.
- Motorists traveling westbound will be detoured to Yakima Ave. View detour map.
- Business access will remain open, but the routes will change.
- The closure is expected to remain in place through mid-July.
Lane closures and flagging in Jerome the week of June 8
Lane closures will occur on I-84 and local roads near the South Jerome Interchange as crews apply anti-graffiti paint to the new walls and bridges.
What you need to know:
- Daytime lane closures will occur on I-84, Lincoln Avenue, Bob Barton Road and E Frontage Road N the week of June 8.
- Flaggers will direct traffic on local roads.
- This work is weather-dependent and may be delayed due to conditions.
Current traffic impacts
ITD began work on the South Jerome Interchange in February 2024. Sign up for updates to receive construction information directly to your inbox.
Right now, motorists can expect:
- Traffic on Lincoln Avenue moved to the new bridge over I-84 in fall 2025. Traffic is restricted to one lane in each direction between the I-84 bridge and E Frontage Road S. This traffic pattern is expected to remain in place until late 2026. View a map of the current traffic pattern.
- Traffic from the eastbound off-ramp is detoured to Bob Barton Road. This traffic pattern is expected to remain in place through summer 2026. View a map of the current traffic pattern.
- Intermittent I-84 lane closures will occur for the duration of the project. For the next few months, daytime lane closures may occur as crews work on the new Lincoln Avenue bridges.
Flagging on local roads
Crews will intermittently flag on Bob Barton Road, E Frontage Road N and Lincoln Avenue near the South Jerome Interchange. Flagging will allow crews to work on the new interchange ramps and bridges.
Flagging is expected to occur from 7 a.m. to 5 p.m. and business access is expected to remain open.
Sign up for updates to receive construction information directly to your inbox.
What to expect during construction:Â
- Most work will occur Monday – Saturday from 6 a.m. to 8 p.m.
- Intermittent nighttime closures on I-84 will be necessary for bridge work, girder placement and traffic shifts.
- Lane closures, traffic shifts and ramp changes will occur.
- Local road closures will occur and detours will be in place.
- Speed limits will be reduced.
Summer 2025 update
Check out the 2025 update video to learn about work on the:
- Interchange ramps
- New Lincoln Avenue bridges.
- I-84 Jerome to Twin Falls widening project
Project overview
In 2024, crews began work to replace the South Jerome Interchange. The interchange was originally built in 1966, and it has reached the end of its design life. The new interchange will be a Divided Diamond/Couplet design.
The new design will:
- Replace aging structures to meet current standards.
- Improve safety by reducing the impact of the frontage roads on the on- and off-ramps.
- Increase traffic flow by installing new traffic signals.
- Add a sidewalk and bike lane to Lincoln Avenue bridges.
Sign up for construction updates:
- Sign up for updates
- Email: info@jerometotwin.org
- Call: (208) 391-3735
- Text: 84JTF to 1-866-483-8422
Process & Schedule
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Early 2024 – Fall 2024
Began improvements to Lincoln Avenue. Constructed the eastbound on-ramp, temporary eastbound off-ramp and improvements to Bob Barton Road. Began Lincoln Avenue bridge work. Started work on E Frontage Road N.
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Fall 2024 – Summer 2025
Built the new westbound on-ramp, a temporary westbound off-ramp and a temporary eastbound on-ramp. Continued improvements to E Frontage Road N, Lincoln Avenue and the eastbound off-ramp. Continued bridge work.
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Summer 2025 – Early 2026
Completed the new westbound off-ramp and the northbound Lincoln Avenue bridge. Continue work on the eastbound off-ramp and the southbound Lincoln Avenue bridge. Demolish the existing Lincoln Avenue bridge.
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2026
Complete the eastbound off-ramp, southbound Lincoln Avenue bridge and I-84 widening under the interchange. Construction is expected to be complete in 2026.
Project Photos
Frequently Asked Questions
The I-84 South Jerome Interchange was originally built in 1966, and it has reached the end of its design life. The new design will prepare the interchange to serve South-Central Idaho for years to come.
The new interchange was designed to meet traffic needs for the next 20+ years.
It will do this by:
- Reducing the impact of frontage roads on interchange ramps.
- Adding traffic signals that will maximize traffic flow and improve safety.
The Divided Diamond/Couplet design will improve safety, accommodate pedestrian and bicycle travel and increase traffic flow on I-84, Bob Barton Road and Frontage Road. This design was selected from over two dozen alternatives because it best meets each of these project goals.
Construction began in February 2024 and is expected to be completed in 2026.