Overview
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- Widening I-84 to three lanes in each direction with auxiliary lanes between interchanges.
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- Replacing the 10th Avenue Interchange.
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- Removing one westbound on-ramp at the 10th Avenue Interchange.
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- Updating the pedestrian overpass.
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- Building a soundwall along Hannibal Street.
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- Adding a traffic signal at the westbound ramps at the Centennial Way Interchange.
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Watch the July 2026 I-84 Corridor Monthly Update Now!
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Join Matt Kreizenbeck and Styles Salek for the latest on I-84 projects in Caldwell and Nampa and what drivers should know before hitting the road.
Tune in to learn about:
- What is happening at the Karcher Interchange in Nampa.
- Which interchange ramps are closed in Caldwell.
- Safety tips during the 100 Deadliest Days.
Current traffic impacts
Here is what motorists can expect right now. This section is updated as conditions change.
- View the latest email update.
- Centennial Way eastbound on-ramp is closed until August, 2026. View the detour map.
- 10th Avenue is restricted to one lane in each direction between the interchange ramps.
- Please plan for nightly lane closures over the next several months as crews widen I-84 in Caldwell.
- 10th Avenue westbound loop ramp is closed until summer 2027. View the detour map.
- Frontage Road: one-way traffic until 2027.
- Wide loads are restricted on ramps. Check Idaho 511 for current width restrictions.
What to expect during construction
Construction will happen in stages. Below are impacts you will see throughout the project.
- All lanes of l-84 will be open in both directions during the day.
- 10th Avenue westbound loop ramp will be closed until summer 2027. View the detour map.
- Overnight closures and lane restrictions will be necessary on I-84.
- Extended ramp closures at the Centennial Way and 10th Avenue interchanges (Exits 27 and 28) will occur.
- One-way traffic on Hannibal Street and Frontage Road until 2027.
- Access to local businesses will be open, but your route may change.
What will Centennial Way to Franklin Road look like once completed?
TECM funding
This project is being funded with Transportation Expansion and Congestion Mitigation (TECM) funds as part of Governor Little’s Leading Idaho initiative. The program allows ITD to accelerate project timelines to address rapid growth and build critical infrastructure today that would otherwise take many years to fund and build.
The I-84 corridor is one of 13 approved TECM corridors in the state. Funding for the construction phases on this corridor will be determined based on project readiness and funding availability.
Other projects in the area
Click the map to find more information about nearby construction projects, or contact your local agency below:
- Idaho Transportation Department
- I-84 Karcher Interchange Project | (208) 377-9688
- SH-55: Farmway to Middleton | (208) 377-9688
- Highway District 4:
- Farmway/Ustick Roundabout Project | (208) 454-8135
- City of Caldwell:
- Linden and Ward Roundabout | (208) 377-9688
- City of Nampa:
- Middleton Road Culvert Work | (208) 465-2221
Downloads & Resources
Contact the project team
If you have questions or comments about this project, contact the project team at 84corridor@itd.idaho.gov or 208-334-8002. You can also text 84CORRIDOR to 1-866-483-8422.
Join the project mailing list
Stay up to date with important information and milestones for this project.