Interstate 15 in Montana

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Interstate 15 marker

Interstate 15
Route information
Maintained by Montana Department of Transportation
Length: 397.50 mi[1] (639.71 km)
Major junctions
South end: I-15 at Idaho state line
  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
Highway system

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.


Route description[edit]

I-15 crosses into Montana from Idaho just south of Lima Reservoir, before the route continues northwest through farmland and desert. The freeway turns north at Clark Canyon Reservoir, before turning northeast. In the town of Dillon, I-15 passes near Clarks Lookout State Park before beginning to parallel the Big Hole River. The freeway then turns away from the river, continuing northeast along Divide Creek through the desert, before splitting away from the creek and heading north. I-15 eventually merges into I-90 at a trumpet interchange.[2]

I-15 and I-90 run concurrently through the city of Butte, coming first to an interchange with I-115, signed as Business Loop 15 and Business Loop 90. I-15 and I-90 pass through a green area in the middle of the city, before I-15 splits off to the northeast on the eastern end of the town. The freeway goes through the forest and plains north of I-90 before winding along Bison Creek and later the Boulder River. I-15 passes through the town of Basin before leaving the mountains and providing access to Boulder. Paralleling Beavertown Creek, the road winds through the hills before passing through Jefferson City. The freeway continues into Helena, where I-15 intersects US 12 and runs concurrently with US 287 through the outskirts of the city before continuing north through the plains.[2]

I-15 and US 287 continue along Little Prickly Pear Creek before passing through the town of Wolf Creek after several miles. Northeast of there, US 287 continues north, while I-15 runs close to the Missouri River. The freeway provides access to Cascade and then continues through the plains through Ulm before turning northeast into the city of Great Falls. I-315 and US 89 intersect with I-15 at a trumpet interchange, and US 89 continues north and then northwest along I-15 for a few miles before continuing to the west. I-15 continues northwest through farmland before passing near Dutton and Brady, and the city of Conrad. US 2 intersects I-15 in the town of Shelby. The freeway continues through the town of Sunburst before becoming Alberta Highway 4 at the Canadian border just north of Sweetgrass[2]

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

Exit list[edit]

County Location[3] Mile[3] km Exit Destinations Notes
Monida Pass 0.000 0.000 I-15 continues south towards Idaho Falls
0.509 0.819 0 S-509 – Monida
Beaverhead   9.544 15.360 9 Snowline (ranch access)
Lima 15.185 24.438 15 Lima
Dell 23.832 38.354 23 Dell
  29.609 47.651 29 Kidd
  37.353 60.114 37 Red Rock
  44.454 71.542 44 S-324 west – Clark Canyon Reservoir
  51.199 82.397 51 Dalys Southbound exit and northbound entrance only
  52.613 84.672 52 Grasshopper Creek
  56.028 90.168 56 Barretts
  59.702 96.081 59 S-278 west / S-222 – Jackson, Wisdom
Dillon 62.440 100.487 62 I-15 Bus. north – Dillon
63.813 102.697 63 I-15 Bus. south / MT 41 – Dillon
  75.046 120.775 74 Apex, Birch Creek
  85.272 137.232 85 Glen
Madison Melrose 93.188 149.972 93 Melrose
Silver Bow   99.266 159.753 99 Moose Creek Road
  102.515 164.982 102 MT 43 west – Wisdom
  111.271 179.073 111 Feely
  116.361 187.265 116 Buxton
  119.970 193.073 119 Hub Access – Silver Bow
  121.462 195.474 121 I-90 – Missoula, Butte South end of I-90 overlap
  122.491 197.130 122 Rocker
Butte 124.319 200.072 124 I-115 / I-15 Bus. / I-90 Bus. – City Center
126.343 203.329 126 Montana Street
127.961 205.933 127 Harrison Avenue signed as exits 127A and 127B eastbound
129.498 208.407 129 I-90 – Billings North end of I-90 overlap; I-15 numbered as exit
Jefferson   134.061 215.750 134 Woodville
  138.698 223.213 138 Elk Park
  151.226 243.375 151 Bernice
  156.391 251.687 156 Basin
  159.831 257.223 160 High Ore Road
  164.406 264.586 164 MT 69 – Boulder
  175.576 282.562 176 Jefferson City
  181.575 292.217 182 Clancy
  187.161 301.206 187 S-518 (Sec-282) – Montana City
Lewis and Clark Helena 189.986 305.753 190 South Helena, Nob Hill area
191.602 308.354 192 I-15 Bus. north / US 12 / US 287 south – Townsend, Capitol Area South end of US 287 overlap
192.772 310.236 I-15 Bus. south (Cedar Street)
199.535 321.120 200 S-279 / S-453 (Lincoln Road)
  208.573 335.666 209 Gates of the Mountains
  215.440 346.717 216 Sieben
  218.667 351.910 219 Spring Creek Northbound exit and southbound entrance
  226.223 364.071 226 S-434 – Wolf Creek
  228.022 366.966 228 US 287 north – Augusta, Choteau North end of US 287 overlap
  233.698 376.100 234 Craig
Cascade   239.817 385.948 240 Dearborn
  243.533 391.928 244 Canyon Access
  246.807 397.197 247 Hardy Creek
  249.531 401.581 250 Local Access
  254.042 408.841 254 MT 68 – Cascade
  255.555 411.276 256 MT 68 – Cascade
  269.495 433.710 270 S-330 – Ulm
Great Falls 276.889 445.610 277 Great Falls International Airport
278.063 447.499 278 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
279.652 450.056 280 I-15 Bus. south to US 87 north (Central Avenue West)
281.631 453.241 282 To US 87 north / Northwest Bypass Southbound exit and northbound entrance
  285.509 459.482 286 Manchester
  289.607 466.077 290 US 89 north / MT 200 west – Missoula, Choteau North end of US 89/MT 200 overlap
  296.752 477.576 297 Gordon
Teton   301.528 485.262 302 S-431 – Power
  311.672 501.587 313 S-221 / S-379 – Dutton, Choteau
  319.467 514.132 321 Collins Road
Pondera   326.128 524.852 328 S-365 – Brady
  333.507 536.727 335 I-15 Bus. north (Midway Road) – Conrad
Conrad 337.358 542.925 339 I-15 Bus. south – Conrad
  343.245 552.399 345 S-366 (Ledger Road) – Tiber Dam
  346.250 557.235 348 MT 44 (Valier Road)
  350.259 563.687 352 Bullhead Road
Toole   356.788 574.195 358 Golf Course Road, Marias Valley Road
Shelby 361.350 581.536 363 I-15 Bus. north / US 2 – Shelby, Cut Bank
  362.601 583.550 364 I-15 Bus. south – Shelby
  367.118 590.819 369 Bronken Road
  371.114 597.250 373 Potter Road
  377.123 606.921 379 S-215 / S-343 – Kevin, Oilmont
  383.128 616.585 385 Swayze Road
Sunburst 387.677 623.906 389 S-552 – Sunburst
  391.930 630.750 394 Ranch Access
  395.770 636.930 397 Sweetgrass (S-214)
  396.030 637.349 Canadian border
Roadway continues north as Hwy 4
1.000 mi = 1.609 km; 1.000 km = 0.621 mi

References[edit]

External links[edit]

Route map: Google / Bing


Interstate 15
Previous state:
Idaho
Montana Next state:
Terminus