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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 late 2022. The overpass is part of ITD's improvements to I-84 in Caldwell.

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Construction Update

Construction

The Idaho Transportation Department closed the Ustick Overpass, and the Notus Canal Bridge in May 2021. ITD will detour motorists 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
Spring 2022
Ustick Overpass complete
Spring 2022
Notus Canal Bridge construction begins and a new detour in place
Late 2022
Notus Canal Bridge complete
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 between Karcher/Midland Boulevard in Nampa and Franklin Boulevard in Caldwell?
Why isn’t ITD adding a new interchange to I-84 between Karcher/Midland Boulevard in Nampa and Franklin Boulevard in 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 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 allow for future widening on I-84 between Franklin Road Interchange in Caldwell and Karcher Interchange in Nampa. As part of the project, the Ustick and Aviation Way intersection must be reconstructed.

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

Improvements for the project 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.
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 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 to Middleton Road to the Nampa-Caldwell Boulevard. Click here for a detour map.

Closures
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.

Closures
How long will Aviation Way be closed?
How long will Aviation Way be closed?

The closure lasted approximately two months.

General
Why can’t ITD wait until the Ustick/Midland roundabout is completed before they start work?
Why can’t ITD wait until the Ustick/Midland roundabout is completed before they start work?

If the grade of Aviation Way is not raised, the overpass will be unable to connect to Ustick Road. It is time sensitive because new asphalt pavement is being placed at the intersection. Asphalt must be placed during warmer temperatures. If work on the intersection is delayed, it will delay other parts of the project later on, and would likely delay future projects to improve I-84. The I-84 improvements have been planned sequentially and it is important to complete all projects on time.

General
Why is a full closure necessary at the Aviation Way/Ustick Road intersection? Can’t ITD keep one lane open?
Why is a full closure necessary at the Aviation Way/Ustick Road intersection? Can’t ITD keep one lane open?

The intersection will be raised by five feet. Raising an intersection requires working on the whole intersection at one time. There is no way to keep one lane open.

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.EDAHO.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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