Interstate 90 in Montana

Interstate 90 in Montana

 

I-90
Get started Saltese
End Wyola
Length 554 mi
Length 891 km
Route
  • Idaho0 Lookout Pass
  • 5 frontage road
  • 10 Saltese
  • 16 Haugan
  • 18 frontage road
  • 22 12 Mile Road
  • 25 frontage road
  • 26 Forest Road 889
  • 30 Forest Road 431
  • 33 St. Regis
  • 37 Old U.S. 10
  • 43 Southside Road
  • 47 Superior
  • 55 County Road 450
  • 61 County Road 454
  • 66 Old U.S. 10
  • 70 Old US 10
  • 75 Alberton
  • 77 Petty Creek Road
  • 82 frontage road
  • 85 Huson
  • 89 Frenchtown
  • 96
  • 99 Missoula Airport
  • 101 Missoula
  • 104 Downtown Missoula
  • 105 Missoula
  • 107 East Missoula
  • 109 Bonner
  • 113 frontage road
  • 120 Clinton
  • 126 Elliot Airstrip
  • 130 Beavertail Road
  • 138 Mullan Road
  • 153 Drummond
  • 154 Drummond
  • 162 Jens Road
  • 166 Gold Creek
  • 170 frontage road
  • 174 → Helena
  • 175 Garrison
  • 179 Beck Hill Road
  • 184 Deer Lodge
  • 187 Deer Lodge
  • 195 Race Track Road
  • 197 Galen Road
  • 201 frontage road
  • 208 Anaconda
  • 211 Fairmont Road
  • 216 frontage road
  • 219 → Salt Lake City
  • 122 Browns Gulch Road
  • 124 → Butte
  • 126-228: Butte
  • 126 Montana Street
  • 127 Harrison Avenue
  • 227 → Helena / Calgary
  • 228 Continental Drive
  • 233 Homestake Lake
  • 241 Pipestone Road
  • 249 Whitehall
  • 256 Cardwell
  • 267 Cottonwood Road
  • 274 → Yellowstone / Helena
  • 278 Three Forks
  • 283 Buffalo Jump Road
  • 288 Manhattan
  • 298 Belgrade
  • 305 West Bozeman
  • 306 Bozeman
  • 309 East Bozeman
  • 313 Bozeman Trail Road
  • 316 frontage road
  • 319 Jackson Creek Road
  • 324 frontage road
  • 330 West Livingston
  • 333 Livingston
  • 337 East Livingston
  • 340 → Great Falls
  • 343 Mission Creek Road
  • 350 frontage road
  • 352 frontage road
  • 354 frontage road
  • 362 frontage road
  • 367 Big Timber
  • 370 Big Timber
  • 377 Greycliff
  • 384 frontage road
  • 392 Reed Point
  • 396 frontage road
  • 400 frontage road
  • 408 Columbus
  • 426 Park City
  • 433 Laurel
  • 434 Laurel
  • 437 frontage road
  • 443-452: Billings
  • 443 Zoo Drive
  • 446 Laurel Road
  • 447 Billings Boulevard
  • 450 Downtown Billings
  • 452
  • 455 Lockwood
  • 456 → Fargo
  • 462 Pryor Creek Road
  • 469 Arrow Creek Road
  • 478 Fly Creek Road
  • 484 Old US 87
  • 495 Hardin
  • 497 Hardin
  • 503 frontage road
  • 509 Crow Agency
  • 511 → Belle Fourche
  • 514 Garryowen
  • 530 Lodge Grass
  • 544 Wyola
  • 549 Aberdeen Road
  • Wyoming

Interstate 90 or I -90 is an Interstate Highway in the U.S. state of Montana. The highway forms a long east-west route across the state, from the Idaho border at Lookout Pass through numerous regional towns to the Wyoming border. The largest town on the route is Billings, the main junction is Butte. The highway takes you through a varied landscape, from the Bitterroot Range in the far west to the forested valleys and isolated mountain ranges in the middle and the barren High Plains in the east. I-90 travels its longest distance within a single state in Montana, the highway is 891 kilometers long.

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Travel directions

I-90 west of Missoula.

Western Montana

I-90 begins on the border with the state of Idaho, formed by the 1,436-foot Lookout Pass in the Bitterroot Range. Interstate 90 in Idaho comes here from Coeur d’Alene and continues into Montana. The highway heads southeast through Lolo National Forest, a densely forested area. The highway initially leads through a narrow valley, from St. Regis the highway follows the Clark Fork River to Missoula. From here, I-90 begins to ascend gradually again. Missoula is 150 miles from the Idaho border and is the first major town on the route. One crosses the US 93, while a double numbering starts with the US 12.

The highway continues east from Missoula for about 70 miles to Garrison, where US 12 exits toward the state capital Helena and I-90 turns south. The highway then continues for about 60 kilometers in a southerly direction, as far as Anaconda. I-90 curves east again here, after which a short double numbering with Interstate 15 follows past the town of Butte. I-15 joins west of Butte and splits off east of Butte. Butte is Montana’s main hub, created next to a large copper mine, easily visible from I-90.

Central Montana

I-90 in Butte, overlooking the copper mines.

On the east side of Butte, the highway ascends to the 1,929-foot Homestake Pass. It crosses the Continental Divide and is the highest point of I-90. The descent is especially impressive towards Butte. The landscape east of Butte consists of plains, interspersed with isolated mountain ranges, with peaks up to over 3,000 meters. At Three Forks, US 287 is crossed, after which the highway leads through a more densely populated valley, the most important of which is the town of Bozeman. At Bozeman you cross the US 191.

East of Bozeman, the highway crosses the 1,738-meter-high Bozeman Pass. East of this pass one descends to the valley around Livingston, where US 89 is crossed. This is the main route to Yellowstone National Park, which is about 100 miles south in Wyoming. I-90 then follows the Yellowstone River valley to the east. There are a few small towns on the route, at Big Timber the US 191 connects to the north and at Laurel a double numbering starts with the US 212. The landscape gradually flattens, the mountain ranges give way to plains with occasional shallow canyons.

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Eastern Montana

I-90 at Wyola in Eastern Montana.

Then you reach Billings, the largest city on the route in Montana, and also the largest city in the state. I-90 passes south and east of Billings and intersects with US 87. On the east side of Billings, Interstate 94. turnsoff. I-90 then heads east for more than 60 kilometers to Hardin and then turns south. I-90 leads here over the barren plains of the High Plains, although the landscape is not really flat, it consists of rolling landscape with some rocky elevations. The last 80 miles of I-90 heads south, parallel to the Little Bighorn River. At Crow Agency, US 212 exits into remote southeastern Montana. I-90 passes through an area prone to high winds and lonely. After Wyola, the border with the state of Wyoming follows, after which Interstate 90 in Wyoming continues to Sheridan and Buffalo.

Interstate 90 in Montana

 

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