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US-12 and 21 Street

This project will realign the busiest intersection in Central Idaho to improve safety and traffic flow.

After construction, the design will resemble that of standard intersections and be made of concrete, which resists wear from heavier traffic better than traditional pavement.

Construction phases
Impacts will be consistent.
See the local detour.
Planned improvements
Preview changes.
Come to the meeting
Completed traffic study
Asset 5
Winter 2016
Gathered public comments
Asset 5
Spring 2017
Completed preliminary design
Asset 5
Fall 2017
Finalized design
Asset 5
March 2019
Anticipated beginning of construction
Asset 5
October 2019
Anticipated end of construction
Asset 5

Downloads & Resources

HandoutsAsset 4


Construction is anticipated to begin in March, with an open house held in late February for the public to ask questions. Read more.

Fill out the form below to sign up for updates.

Sign up: US-12 and 21st Street construction updates

US-12 and 21st Street: pre-construction meeting

February 28, 2019

4:00 pm - 7:00 pm

Red Lion Hotel

Come to view improvements about to be constructed, learn about detours and sign up for updates.

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Upcoming meetings

February 28, 2019
Red Lion Hotel
4:00 pm - 7:00 pm
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