List of Interstate Highways in Idaho

Interstate Highways of the Idaho State Highway System
Interstate 15 markerInterstate 184 markerInterstate 90 Business marker
Typical Interstate highway markers
System information
Maintained by ITD
Highway names
Interstates Interstate n (I-n)
US Highways U.S. Highway n (US-n)
State Idaho State Highway n (SH-n)
System links

The Interstate Highways in Idaho are the segments of the Dwight D. Eisenhower National System of Interstate and Defense Highways owned and maintained by the Idaho Transportation Department (ITD) in the U.S. state of Idaho.

Mainline highways

Number Length (mi)[1] Length (km) Southern or western terminus Northern or eastern terminus Formed Removed Notes
I-15 196.000315.431 I-15 near WoodruffI-15 at Monida Pass 01957-01-011957current  
I-15W 62.850101.147 I-84 / US 30 near DecloI-15 in Chubbuck 01957-01-01195701978-01-011978 Became I-86
I-80N 275.650443.616 I-84 near FruitlandI-84 near Black Pine 01957-01-01195701980-01-011980 Became I-84
I-84 275.650443.616 I-84 near FruitlandI-84 near Black Pine 01980-01-011980current Designated as I-80N until 1980
I-86 62.850101.147 I-84 / US 30 near DecloI-15 in Chubbuck 01978-01-011978current Designated as I-15W until 1978
I-90 73.888118.911 I-90 in State LineI-90 at Lookout Pass 01957-01-011957current  
I-180N 3.6205.826 I-84 / US 30 in BoiseUS 20 / US 26 in Boise 01970-01-01197001979-01-011979 Became I-184
I-184 3.6205.826 I-84 / US 30 in BoiseUS 20 / US 26 in Boise 01979-01-011979current Designated as I-180N until 1979, completed in 1990
  •       Former

Business routes

Number Length (mi)[1] Length (km) Southern or western terminus Northern or eastern terminus Formed Removed Notes
I-15 Business Loop 4.3386.981 —— —— Serves McCammon
I-15 Business Loop 1.0001.609 —— —— Serves Inkom
I-15 Business Loop 5.5608.948 —— —— Serves Pocatello
I-15 Business Loop 4.8027.728 —— —— Serves Blackfoot
I-15 Business Loop 7.23011.636 —— —— Serves Idaho Falls
I-84 Business Loop 12.55720.209 —— —— Serves Caldwell and Nampa
I-84 Business Loop 5.9859.632 —— —— Serves Mountain Home
I-84 Business Loop —— —— —— Serves Hammett
I-84 Business Loop 1.4252.293 —— —— Serves Glenns Ferry
I-84 Business Loop 3.5185.662 —— —— Serves Bliss
I-84 Business Loop —— —— —— Serves Jerome
I-84 Business Loop 6.5610.56 —— —— Serves Burley
I-86 Business Loop 6.47510.421 —— 01972-01-011972current Serves American Falls
I-90 Business Loop 5.6409.077 —— —— Serves Post Falls
I-90 Business Loop 3.8346.170 —— —— Served Coeur d'Alene
I-90 Business Loop 3.9666.383 —— —— Serves Osburn
I-90 Business Loop —— —— —— Serves Silverton
I-90 Business Loop 1.2432.000 —— —— Serves Wallace
I-90 Business Loop 1.0001.609 —— —— Serves Mullan
  •       Former

See also

  • Idaho portal
  • U.S. Roads portal

References

  1. 1 2 "Milepoint Logs". Idaho Transportation Department. Retrieved February 15, 2017.
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