List of Interstate Highways in Montana

Interstate Highways of the Montana Highway System
Typical Interstate highway markers used for Interstate 90, Interstate 115, and Business loop 94 in Montana
Interstate Highways highlighted in red
System information
Maintained by MDT
Highway names
Interstates	Interstate n (I-n)
US Highways	U.S. Highway n (US n)
State	Montana Highway n (MT n)
Secondary:	Secondary Highway n (S-n)
System links
Montana Highway System Interstate US State Secondary

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

The state's Interstate highways, totaling 1,198 miles (1,928 km), were built between 1956 and 1988 at a cost of $1.22 billion. 95 percent of the system serves rural areas, the highest proportion of any state under Interstate program. ^[1] The entire Interstate system in Montana was designated as the Purple Heart Trail in 2003. ^[2]

Mainline highways

Number	Length (mi) [3]	Length (km)	Southern or western terminus	Northern or eastern terminus	Formed	Removed
I-15	396.03	637.35	I-15 near Monida	Hwy 4 at Sweetgrass	—	—
I-90	551.68	887.84	I-90 near Mullan, ID	I-90  / US 87 near Ranchester, WY	—	—
I-94	249.15	400.97	I-90 at Billings	I-94 near Beach, ND	—	—
I-115	1.19	1.92	I-15  / I-90 in Butte	Downtown Butte	—	—
I-315	0.83	1.34	I-15  / US 89  / MT 200 in Great Falls	Downtown Great Falls	—	—

Business routes

Number	Length (mi)	Length (km)	Southern or western terminus	Northern or eastern terminus	Formed	Removed	Notes
I-15 BL	—	—	—	—	—	—	Serves Dillon
I-15 BL	—	—	—	—	—	—	Serves Butte
I-15 BL	—	—	—	—	—	—	Serves Helena
I-15 BL	—	—	—	—	—	—	Serves Great Falls
I-15 BL	—	—	—	—	—	—	Serves Shelby
I-90 BL	—	—	—	—	—	—	Serves Alberton
I-90 BL	—	—	—	—	—	—	Serves Missoula
I-90 BL	—	—	—	—	—	—	Serves Deer Lodge
I-90 BL	—	—	—	—	—	—	Serves Butte
I-90 BL	—	—	—	—	—	—	Serves Bozeman
I-90 BL	—	—	—	—	—	—	Serves Livingston
I-90 BL	—	—	—	—	—	—	Serves Big Timber
I-90 BL	—	—	—	—	—	—	Serves Laurel
I-90 BL	—	—	—	—	—	—	Serves Billings
I-90 BL	—	—	—	—	—	—	Serves Hardin
I-94 BL	—	—	—	—	—	—	Serves Miles City
I-94 BL	—	—	—	—	—	—	Serves Glendive

See also

• U.S. Roadsportal

References

1. Axline, Jon (Autumn 2013). "A Massive Undertaking: Construction Montana's Interstate Highways, 1956–1988". Montana: The Magazine of Western History . 63 (3). Montana Historical Society: 66. ISSN   0026-9891. JSTOR   24416216. OCLC   1051147215.
2. "§ 60-1-210: Purple Heart Trail". Montana Code Annotated 2014. Montana Legislature . Retrieved December 1, 2021.
3. Adderly, Kevin (January 27, 2016). "Table 3: Interstate Routes in Each of the 50 States, District of Columbia, and Puerto Rico". Route Log and Finder List. Federal Highway Administration . Retrieved February 16, 2017.

External links

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   Media related to Interstate Highways in Montana at Wikimedia Commons