Slow down for Work Zones
Learn more about driving safely in road construction & maintenance work. Stay alert & be careful throughout a work zone.
Popular Services & Guides
How we're improving Idaho
Our projects touch every corner of the state and boost quality of life for communities, travelers & visitors.
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SH-16 Construction
SH-16 will improve regional mobility, provide access to I-84 in the rapidly growing central Treasure Valley, and improve commutes for thousands of motorists.
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I-90 Widening: SH-41 to US-95
The first project from the I-90 Corridor Study aims to improve safety and traffic volume capacity.
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I-15 Inkom Corridor
ITD is rebuilding I-15 structures at three locations in and near Inkom.
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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.
Recent News
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May 20, 2026
ITD to begin annual bridge maintenance projects across North Idaho after Memorial Day
Annual bridge repair projects are set to get underway on highways across North Idaho after Memorial weekend.
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May 18, 2026
Lower Lewiston Port of Entry closed for construction
The POE building is being renovated to improve commercial vehicle access and add public restrooms.
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May 15, 2026
Northbound I-15 traffic shifts to begin between Northgate and Fort Hall interchanges
I-15 northbound traffic is about to move into the newly constructed three northbound lanes.
Upcoming Events
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May 21, 2026 1:00 PM– 3:00 PM MST
Negotiated Rulemaking Meeting 2026
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May 25, 2026 12:00 AM– 11:59 PM MST
Memorial Day
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June 16, 2026 8:00 AM –
June 17, 2026 5:00 PM MST
Transportation Board Meeting – June 2026