Interstate 15 in Montana

Interstate 15 Main route of the Interstate Highway System
Maintained by Montana Department of Transportation
Length:	397.5 mi[1] (639.71 km)
South end:	I-15 at Idaho state line
Major junctions:	I-90 in Butte I-115 in Butte US 287 in Helena US 89 in Great Falls US 2 in Shelby
North end:	Hwy 4 at Canadian border near Sweetgrass
Montana Highways < MT 13 MT 16 >

In the U.S. state of Montana, Interstate 15 continues onward from Idaho for nearly 400 miles (640 km) through the cities of Butte, Helena and Great Falls, intersecting with Interstate 90, Interstate 115 and Interstate 315. Interstate 15 reaches its northern terminus at the international border with Alberta, Canada.

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

From Helena to Sweetgrass at the Canadian border, Interstate 15 is dedicated as a memorial highway to the First Special Service Force.

Exit list

This section contains a table that is missing mileposts for one or more junctions. Please help by adding the missing mileposts.

County	Location	Mile	#	Destinations	Notes
Beaverhead			0	Monida (S-509)
			9	Snowline
	Lima		15	Lima
			23	Dell
			29	Kidd
			37	Red Rock
			44	S-324 – Clark Canyon Reservoir
			51	Dalys	Southbound exit and northbound entrance
			52	Grasshopper Creek
			56	Barretts
			59	S-278 (S-222) – Jackson, Wisdom
			62	I-15 Bus. north – Dillon
	Dillon		63	I-15 Bus. south to MT 41 – Dillon, Twin Bridges
			74	Birch Creek, Apex
			85	Glen
Madison			93	Melrose
Silver Bow			99	Moose Creek Road
			102	MT 43 – Divide, Wisdom
			111	Feely
			116	Buxton
			119	Hub Access, Silver Bow
			121	I-90 west – Missoula	South end of I-90 overlap
			122	Rocker (S-276)
	Butte		124	I-115 east (I-15 Bus. north, I-90 Bus. east) – Butte City Center	Northbound exit and southbound entrance
			126	Montana Street
			127	I-15 Bus. south / I-90 Bus. west (Harrison Avenue, MT 2)	Signed as exits 127A (south) and 127B (north)
			129	I-90 east – Billings	North end of I-90 overlap
Jefferson			134	Woodville
			138	Elk Park
			151	Bernice
			156	Basin
			160	High Ore Road
			164	MT 69 – Boulder
			176	Jefferson City
			182	Clancy
			187	S-518 (S-282) – Montana City
Lewis and Clark	Helena		190	South Helena/Nob Hill area
			192	I-15 Bus. north / US 12 / US 287 south – Townsend, Capitol Area
			193	I-15 Bus. south (Cedar Street)
			200	S-279 / S-453 (Lincoln Road)
			209	Gates of the Mountains
			216	Sieben
			219	Spring Creek	Northbound exit and southbound entrance
			226	S-434 – Wolf Creek
			228	US 287 north – Augusta, Choteau	North end of US 287 overlap
			234	Craig
Cascade			240	Dearborn
			244	Canyon Access
			247	Hardy Creek
			250	Local Access
			254	File:MT-68.svg MT 68 – Cascade
			256	File:MT-68.svg MT 68 – Cascade
			270	S-330 – Ulm
	Great Falls		277	Great Falls International Airport
			278	I-15 Bus. north / US 89 south / MT 200 east (10th Avenue South, I-315 east, MT 3 south)	South end of US 89/MT 200 overlap
			280	I-15 Bus. south to US 87 north (Central Avenue West)
			282	To US 87 north / Northwest Bypass	Southbound exit and northbound entrance
			286	Manchester
			290	US 89 north / MT 200 west – Missoula, Choteau	North end of US 89/MT 200 overlap
			297	Gordon
Teton			302	S-431 – Power
			313	S-221 / S-379 – Dutton, Choteau
			321	Collins Road
Pondera			328	S-365 – Brady
			335	I-15 Bus. north (Midway Road) – Conrad
	Conrad		339	I-15 Bus. south – Conrad
			345	File:MT-sec-366.svg S-366 (Ledger Road) – Tiber Dam
			348	MT 44 (Valier Road)
			352	Bullhead Road
Toole			358	Golf Course Road, Marias Valley Road
	Shelby		363	I-15 Bus. north / US 2 – Shelby, Cut Bank
			364	I-15 Bus. south – Shelby
			369	Bronken Road
			373	Potter Road
			379	S-215 / S-343 – Kevin, Oilmont
			385	Swayze Road
	Sunburst		389	S-552 – Sunburst
			394	Ranch Access
			397	Sweetgrass (S-214)
	Canadian border

References

Interstate 15
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