Projects 5 |

US-20 Idaho Falls to Arco

Improvements are being planned for US-20 west of Idaho Falls to Arco. This important route leads to the Idaho National Laboratory, where more than 6,000 Idahoans are employed.
- Project Regions
  East Idaho
- Project Routes
  US-20
- Project Phase
  Planning & Design
US-26 & Hitt Road (25th East) Intersection

Improvements are in the works for the busy intersection of US-26 and Hitt Road in Idaho Falls. The road will be expanded up to five lanes as early as late 2026- 2027.
- Project Regions
  East Idaho
- Project Routes
  US-26
- Project Phase
  Planning & Design
COMPLETE: US-20 South St. Anthony Interchange

Construction is now complete on Exit 343, a new full interchange on US-20 south of St. Anthony.
- Project Regions
  East Idaho
- Project Routes
  US-20
- Project Phase
  Complete
US-20 Chester to Ashton Environmental Assessment

The Idaho Transportation Department is conducting an Environmental Assessment to be able to improve US-20 to a four-lane highway from Chester to Ashton.
- Project Regions
  East Idaho
- Project Routes
  US-20
- Project Phase
  Planning & Design
US-93 Pahsimeroi River Bridge Replacement

The Pahsimeroi River Bridge on US-93 between Challis and Salmon is reaching the end of its service life and plans for improvement are underway.
- Project Regions
  East Idaho
- Project Routes
  US-93
- Project Phase
  Planning & Design
COMPLETE: SH-3 Soldier Creek Bridge

ITD will replace the nearly 100-year-old Soldier Creek Bridge on SH-3 to improve safety and reliability with a wider structure, higher load capacity, new guardrail, and 5-foot shoulders.
- Project Regions
  North Idaho
- Project Routes
  State Highway 3
- Project Phase
  Complete
SH-52 Snake River Bridge Replacement

The bridge has reached the end of its service life and will be replaced.
- Project Regions
  Southwest Idaho
- Project Routes
  State Highway 52
- Project Phase
  Planning & Design
SH-55 Rainbow Bridge

ITD is designing a new bridge over the North Fork of the Payette River and determining the future of the existing Rainbow Bridge.
- Project Regions
  Southwest Idaho
- Project Routes
  State Highway 55
- Project Phase
  Planning & Design
US-20 Ashton to SH-87 Junction PEL Study

A Planning and Environmental Linkages study is nearing completion that will greatly aid the NEPA process that must come first before large-scale improvements can be made to US-20 from Ashton to SH-87.
- Project Regions
  East Idaho
- Project Routes
  US-20
- Project Phase
  Planning & Design
I-84 Mobility Improvement Study

The Idaho Transportation Department is studying current and projected future traffic volumes on Interstate 84 between the Garrity Boulevard Interchange and the Flying Wye Interchange.
- Project Regions
  Southwest Idaho
- Project Routes
  Interstate 84
- Project Phase
  Study
COMPLETE: SH-14 Roadway Restoration

This project removed old pavement and inlaid new surface to improve the ride quality and extend the life of the roadway towards Elk City.
- Project Regions
  North-Central Idaho
- Project Routes
  State Highway 14
- Project Phase
  Complete
SH-162 Flood Repair

The goal of this project is to repair damage from April 2024 flooding along SH-162.
- Project Regions
  North-Central Idaho
- Project Routes
  State Highway 162
- Project Phase
  In Construction