| Interstate Highways of the Montana Highway System | |||||||||||||||||||
| Shields: |
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| Caption: | Typical Interstate highway markers used for Interstate 90, Interstate 115, and Business loop 94 in Montana | ||||||||||||||||||
| Maint: | MDT | ||||||||||||||||||
| Interstate: | Interstate n (I-n) | ||||||||||||||||||
| Us: | U.S. Highway n (US n) | ||||||||||||||||||
| Statehwy: | Montana Highway n (MT n) | ||||||||||||||||||
| Label1: | Secondary: | ||||||||||||||||||
| Field1: | Secondary Highway n (S-n) | ||||||||||||||||||
| Links: | MT | ||||||||||||||||||
| Map Custom: | yes | ||||||||||||||||||
| Map Notes: | Interstate Highways highlighted in red | ||||||||||||||||||
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 1198miles, 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]
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