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Idaho Transportation Department to begin widening I-84 in Nampa

Crews are getting ready to add a third lane in each direction between the Karcher/ Midland and Franklin Boulevard interchanges.
Credit: KTVB file photo
A project to widen Interstate 84 between Nampa and Caldwell will ease congestion during the morning and evening commutes.

NAMPA, Idaho —
The road construction season in Canyon County is about to get very busy.

The Idaho Transportation Department says crews will begin preparing the work zone Monday, July 8, ahead of a major construction project set to begin next week on Interstate 84 in Nampa.

ITD is adding lanes to I-84 between the Karcher/ Midland and Franklin Boulevard interchanges.

Construction will be underway on the entire corridor by Monday, July 15.

Officials say all lanes of the interstate will remain open during the morning and evening commute.

RELATED: Speed limit on Interstate 84 in Caldwell lowered to 65 mph

Motorists should be prepared for lane shifts in the work zone and overnight lane restrictions.

"Even though two lanes will be open in both directions during commute times, it is more important than ever to focus on driving well through the work zone," said Amy Schroeder, ITD Program Manager of the I-84 Corridor expansion. "Traffic may be shifted around the work zone from one week to the next. Attentive driving will keep everyone safe and reduce unnecessary traffic backups."

It's all part of a multi-year process to improve the interstate in Canyon County.

Construction in 2019 and 2020 will include:
• Adding a third lane to eastbound and westbound I-84.
• Adding a fourth "auxiliary" lane in both directions between interchanges. Auxiliary lanes allow traffic to travel between two exits without merging with through traffic.
• Replacing the Northside Interchange with a Single Point Urban Interchange.
• Rebuilding several bridges over the railroad, irrigation canal and Mason Creek.
• Completing the replacement of the Karcher Road Overpass.
• Widening the eastbound off-ramp and modifying signals at the Franklin Boulevard Interchange.

Construction is also scheduled in the future for I-84 west of the Karcher Interchange.

Work includes replacing the Middleton and Ustick bridges and widening I-84 to Franklin Road in Caldwell.