Section of Interstate Highway in Montana, United States
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
Length
396.030 mi[1] (637.349 km)
NHS
Entire route
Major junctions
South end
I-15 at the Idaho state line
Major intersections
I-90 in Butte
I-115 in Butte
US 287 in Helena
US 89 / MT 200 in Great Falls
US 2 in Shelby
North end
Hwy 4 at the Sweetgrass-Coutts Border Crossing near Sweetgrass
Location
Country
United States
State
Montana
Counties
Beaverhead, Madison, Silver Bow, Jefferson, Lewis and Clark, Cascade, Teton, Pondera, Toole
Highway system
Interstate Highway System
Main
Auxiliary
Suffixed
Business
Future
Montana Highway System
Interstate
US
State
Secondary
← MT 13
→ MT 16
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.
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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Global Information
I-15 at the Idaho state line
Hwy 4 at the Sweetgrass-Coutts Border Crossing near Sweetgrass
