List of Interstate Highways in Idaho
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.
| Interstate Highways of the Idaho State Highway System | |
|---|---|
   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 | |
| |
Mainline highways
| Number | Length (mi)[1] | Length (km) | Southern or western terminus | Northern or eastern terminus | Formed | Removed | Notes | |
|---|---|---|---|---|---|---|---|---|
| I-15 |
196.000 | 315.431 | I-15 near Woodruff | I-15 at Monida Pass | 1957 | current | ||
.svg.png.webp){kind=small} I-15W |
62.850 | 101.147 | I-84 / US 30 near Declo | I-15 in Chubbuck | 1957 | 1978 | Became I-86 | |
.svg.png.webp){kind=small} I-80N |
275.650 | 443.616 | I-84 near Fruitland | I-84 near Black Pine | 1957 | 1980 | Became I-84 | |
 I-84 |
275.650 | 443.616 | I-84 near Fruitland | I-84 near Black Pine | 1980 | current | Designated as I-80N until 1980 | |
 I-86 |
62.850 | 101.147 | I-84 / US 30 near Declo | I-15 in Chubbuck | 1978 | current | Designated as I-15W until 1978 | |
 I-90 |
73.888 | 118.911 | I-90 in State Line | I-90 at Lookout Pass | 1957 | current | ||
 I-180N |
3.620 | 5.826 | I-84 / US 30 in Boise | US 20 / US 26 in Boise | 1970 | 1979 | Became I-184 | |
| I-184 |
3.620 | 5.826 | I-84 / US 30 in Boise | US 20 / US 26 in Boise | 1979 | current | Designated as I-180N until 1979, completed in 1990 | |
| ||||||||
Business routes
| Number | Length (mi)[1] | Length (km) | Southern or western terminus | Northern or eastern terminus | Formed | Removed | Notes | |
|---|---|---|---|---|---|---|---|---|
 I-15 BL |
4.338 | 6.981 | — | — | — | — | Serves McCammon | |
| I-15 BL |
1.000 | 1.609 | — | — | — | — | Serves Inkom | |
| I-15 BL |
5.560 | 8.948 | — | — | — | — | Serves Pocatello | |
| I-15 BL |
4.802 | 7.728 | — | — | — | — | Serves Blackfoot | |
| I-15 BL |
7.230 | 11.636 | — | — | — | — | Serves Idaho Falls | |
 I-84 BL |
12.557 | 20.209 | — | — | — | — | Serves Caldwell and Nampa | |
| I-84 BL |
5.985 | 9.632 | — | — | — | — | Serves Mountain Home | |
| I-84 BL |
— | — | — | — | — | — | Serves Hammett | |
| I-84 BL |
1.425 | 2.293 | — | — | — | — | Serves Glenns Ferry | |
| I-84 BL |
3.518 | 5.662 | — | — | — | — | Serves Bliss | |
| I-84 BL |
— | — | — | — | — | — | Serves Jerome | |
| I-84 BL |
6.56 | 10.56 | — | — | — | — | Serves Burley | |
 I-86 BL |
6.475 | 10.421 | — | — | 1972 | current | Serves American Falls | |
| I-90 BL |
5.640 | 9.077 | — | — | — | — | Serves Post Falls | |
| I-90 BL |
3.834 | 6.170 | — | — | — | — | Served Coeur d'Alene | |
| I-90 BL |
3.966 | 6.383 | — | — | — | — | Serves Osburn | |
| I-90 BL |
— | — | — | — | — | — | Serves Silverton | |
| I-90 BL |
1.243 | 2.000 | — | — | — | — | Serves Wallace | |
| I-90 BL |
1.000 | 1.609 | — | — | — | — | Serves Mullan | |
| ||||||||
References
- "Milepoint Logs". Idaho Transportation Department. Retrieved February 15, 2017.
External links
Media related to Interstate Highways in Idaho at Wikimedia Commons
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