Travel Reference (MT)

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Scanning Laws

Important Notes

Free Highway maps of Montana are available Online. Electronic Version here and Paper Map Request form here

Interstate Highways

I 15

Begins at the US-Candian Border as a continuance of CA 4 in Alberta. Ports of Entry are Coutts on the Canada side and Sweetgrass on the US Side. Travels SB and exits the south side of Montana in to Clark County, Idaho

I 115

  • Service Spur starting in Downtown Butte, and ending also in Butte where it intersects with I 15 and I 90.

I 315

  • Service Spur starting in Downtown Great Falls, and ending also in Great Falls where it intersects I 15, US 89 and MT 200

I 90

I 94

Important Highways

US 2

US 12

Enters North Dakota near Williston, ND in Williams County West to East

US 20

Briefly travels through the southern portion of Gallatin County, entering Montana from Freemont County, Idaho at Terghee Pass and leaves Montana in Yellowstone National Park in Park County, Wyoming.

US 87

Begins in Havre, MT and travels SB, leaving the South Side of Montana Sheridan County, Wyoming

US 89

North to South

US 93

Enters Montana from British Columbia at the Port of Roosville and leaves Montana for Idaho into Lemhi County
North to South

US 191

Enters Montana from Saskatchewan at the Ports of Monchy (Canada Side) and Morgan (US Side) Travels Southbound

Meets I 90 in Big Timber and travels Westbound with I 90 to Bozeman where it Heads South

Leaves Montana Just East of West Yellowstone, MT as it enters Yellowstone National Park in Wyoming

US 212

West to East

US 287

Begins in Choteau, MT and travels SB leaving Montana at Yellowstone National Park in Park County, Wyoming

US 310

Spur of US 10 that begins in Greybull, Wyoming travels NB and terminates when it intersects with I-90 Business in Laurel, MT

Primary Population Centers




Great Falls




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