Interstate 15 in Montana

In the U.S. state of Montana, Interstate 15 (I-15, additionally named as the First Special Service Force Memorial Highway from Helena to the Alberta, Canada border, where it continues on into Canada retaining that designation) continues onward from Idaho for nearly 400 miles (640 km) through the cities of Butte, Helena, and Great Falls, intersecting with I-90, I-115, and I-315. I-15 reaches its northern terminus at the international border with Alberta, Canada.

This article is about the section of Interstate 15 in Montana. For the entire route, see Interstate 15.

Interstate 15

First Special Service Force Memorial Highway
I-15 highlighted in red
Route information
Maintained by MDT
Length396.030 mi (637.349 km)
NHSEntire route
Major junctions
South end I-15 at the Idaho state line
Major intersections
North end Hwy 4 at the Sweetgrass-Coutts Border Crossing near Sweetgrass
Location
CountryUnited States
StateMontana
CountiesBeaverhead, Madison, Silver Bow, Jefferson, Lewis and Clark, Cascade, Teton, Pondera, Toole
Highway system
  • Main
  • Auxiliary
  • Suffixed
  • Business
  • Future
  • Montana Highway System
  • Interstate
  • US
  • State
  • Secondary
← MT 13→ MT 16

I-15 joins with I-90 and makes a junction with a short, one-mile (1.6 km) spur route I-115 in Butte.

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