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Ustick Road Overpass

ITD is replacing the Ustick Road Overpass and Notus Canal bridge.

Replacing the overpass will allow additional lanes to be built on I-84. Construction on the overpass began in May 2021 and expected to be completed by Spring 2023. The overpass is part of ITD's improvements to I-84 in Caldwell.

Reemplazando el paso elevado permitirá que se construyan carriles adicionales en la I-84. La construcción del paso elevado comenzó en mayo de 2021 y se espera que esté terminado en la primavera de 2023. El paso elevado es parte de las mejoras de ITD a la I-84 en Caldwell.

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Construction Update

Video: Ustick girder placement

Contractors placed 20 girders for the new overpass in December 2021/January 2022. Watch the video to see the completion of this significant milestone.

Construction

The Idaho Transportation Department closed the Ustick Overpass in May 2021. Motorists are detoured around the construction. Click here for a detour map.

What to expect:

  • The overpass is closed and a detour will be in place.
  • Business access will remain open during normal business hours.
  • Work may be noisy at night.
  • Occasional I-84 detours will occur for bridge demolition and girder placement.
  • Construction work may cause dust and debris.

Variable Speed Limit Signs

ITD is using variable speed limits within the Interstate 84 construction zone in Canyon County in order to improve mobility and preserve safety throughout the project’s lifespan.

When construction crews are not in the work zone or when safety barricades are in place, the speed limits can be raised from 55 mph to 65 mph. This further promotes mobility without sacrificing safety on the Interstate.

A flashing beacon will notify drivers in advance when speed limits are reduced from 65 mph.

Construction progress

See the progress on the Ustick Road Overpass with the latest time lapse video.

Watch now

Improvements

In addition to making room for additional lanes on I-84, the new Ustick Road Overpass will include:

        • Five lanes across the bridge, two lanes in each direction with a center turn lane. *
        • A new bridge over the Notus Canal.
        • Sidewalks and bicycle lanes on both sides of the bridge.

* ITD will build the Ustick Overpass wide enough to accommodate five lanes, but will not open the bridge up to five lanes until the City of Caldwell widens Ustick Road on either side of the bridge. Click here for detailed plans.

May 2021
Begin Ustick Overpass construction
Summer 2022
Ustick Overpass complete
Summer 2022
Notus Canal Bridge construction begins and a new detour in place
2023
Notus Canal Bridge complete
2023
Ustick Road will reopen to traffic
Frequently Asked Questions
You've got questions, we've got answers! Here are some of the most common questions we've received about this project.
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General
Closures
Detours
Linden Street
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General
Why isn’t ITD adding a new interchange to I-84 to Nampa and Caldwell?
Why isn’t ITD adding a new interchange to I-84 to Nampa and Caldwell?

ITD conducted a detailed traffic analysis of I-84 in 2018. ITD analyzed whether or not a new interchange would be needed along I-84 between Nampa and Caldwell. The analysis concluded widening I-84 and improving existing interchanges at Karcher/Midland (in Nampa) and Franklin Road (in Caldwell) will serve the needs of traffic beyond the design year 2045.

General
Why is ITD replacing the Ustick Road Overpass?
Why is ITD replacing the Ustick Road Overpass?

The overpass must be replaced to make room for current widening I-84 between Caldwell and Nampa.

General
What improvements are planned for the Ustick Road Overpass?
What improvements are planned for the Ustick Road Overpass?

Improvements include:

  • Five lanes across the bridge. (Two lanes in each direction with a center
    turn lane)
  • Sidewalks and bicycle lanes on both sides of the bridge.
  • Replacing the bridge over the Notus Canal.
Closures
How long will the overpass be closed?
How long will the overpass be closed?

The Ustick Road Overpass will be closed for approximately 15 months. It is expected to re-open in late Summer 2022.

Detours
What is the detour route for the Ustick detour?
What is the detour route for the Ustick detour?

Traffic will be detoured from Middleton Road to Nampa-Caldwell Boulevard. Click here for a detour map.

General
Why did the Idaho Transportation Department close the Ustick Road and Aviation Way intersection?
Why did the Idaho Transportation Department close the Ustick Road and Aviation Way intersection?

ITD closed the intersection of Ustick Road and Aviation Way to raise the elevation of the intersection to match the height of the new Ustick Road Overpass. The Ustick Road Overpass will be higher to increase the vertical clearance on I-84.

General
How will emergency responders access neighborhoods in the area with so many intersections closed?
How will emergency responders access neighborhoods in the area with so many intersections closed?

ITD has worked closely with emergency responders in the area to ensure they have adequate access routes in the event emergency services are needed.

General
How do I learn more about the project?
How do I learn more about the project?

To learn more:

  • Visit the project website at ITDPROJECTS.ORG/84CORRIDOR
  • Text 84Corridor to 1-866-ITD-84CC
  • Call 208-334-8002
  • Email 84CORRIDOR@ITD.IDAHO.GOV

For business resources: ITDPROJECTS.ORG/I84Businessresources

Linden Street
Why is ITD closing the Linden and Ustick overpasses at the same time?
Why is ITD closing the Linden and Ustick overpasses at the same time?

ITD made the difficult decision to close both Linden and Ustick this year in order to keep the I-84 project on schedule. This section of I-84 includes 20 bridges and other structures (canal crossings, culverts, etc.) that must be reconstructed to accommodate a third interstate lane. Many of these must be reconstructed at the same time.

In the case of the Linden underpass, the work zone is too tight to safely accommodate daily traffic volumes. However, emergency access will be available for police, fire and paramedics. Later in the project, ITD plans to open Linden Street to local traffic during the day. We regret the inconvenience to local travelers and look forward to the project completion. We appreciate your patience.

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