I-84 South Jerome Interchange 

Current traffic impacts

ITD began work on the South Jerome Interchange in February 2024. 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.

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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.

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What to expect during construction: 

• 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

Crews have been hard at work at the I-84 South Jerome Interchange. Check out the 2025 update video for the latest information 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. This 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.