Interstate 90 in Montana

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This article is about the section of Interstate 90 in Montana. For the entire route, see Interstate 90.

Interstate 90 marker

Interstate 90
Riverbend North
Route information
Maintained by MDT
Length: 551.68 mi[1] (887.84 km)
Major junctions
West end: I‑90 at Idaho state line

I‑15 in Butte
I‑115 in Butte

I‑94 in Billings
East end: I-90 / US 87 at Wyoming state line
Counties: Mineral, Missoula, Granite, Powell, Deer Lodge, Silver Bow, Jefferson, Broadwater, Gallatin, Park, Sweet Grass, Stillwater, Yellowstone, Big Horn
Highway system

Montana Highways

MT 89 US 91

Interstate 90 in Montana (I-90) is a portion of the east–west transcontinental Interstate 90, which links Seattle, Washington to Boston, Massachusetts. The portion in the US state of Montana is 551.68 miles (887.84 km) long, linking fourteen counties through central and southern Montana.

Route description[edit]

Mineral County[edit]

Interstate 90 enters Montana and Mineral County from Shoshone County, Idaho over the 4,725-foot (1,440 m) high Lookout Pass, which traverses the Coeur d'Alène Mountains of the Bitterroot Range, and immediately has its first interchange, a partial cloverleaf serving extreme northwest Mineral County. The highway continues southeasterly through woodlands, paralleling the St. Regis River, before meeting the Dena Mora (Lookout Pass) rest area 4.7 mi (7.6 km) east of the Idaho–Montana border.[2] About a 12 mi (0.80 km) from the rest stop is a diamond interchange, serving a small minor road into the St. Joe National Forest in Idaho. The highway continues, winding through the woodlands until another diamond interchange, serving the small unincorporated community of Saltese. Continuing east for about 6 mi (9.7 km), each direction diverges for a small distance before returning side to side for a diamond interchange serving the unincorporated community of Haugan.[3][4]

Two miles (3.22 km) after Haugan, I-90 intersects the census-designated place (CDP) of De Borgia, continuing southeasterly, intersecting several minor roads, before reaching the CDP of St. Regis and Montana Highway 135 (MT 135). The highway stops paralleling the St. Regis river, and begins to parallel, and cross over several times, the Clark Fork river. Superior, the county seat, is intersected before the highway turns south through the Quartz Flats rest area, located 58.2 mi (93.7 km) from the Idaho border.[2] After leaving the rest area, the highway straightens out, heading easterly. The highway continues east before exiting the county, just south of Alberton.[3][4]

Missoula, Granite and Powell counties[edit]

I-90 in Granite County, facing east

Entering Missoula County, the highway intersects Alberton, before continuing easterly through Hudson and MT 263. The highway continues southeast before intersecting the concurrent highways U.S. Route 93 (US 93) and MT 200, which join I-90 from the west. The three highways continue into the county seat of Missoula, where at the first exit, US 93 leaves on the western border of Missoula and travels through Orchard Homes. The next two exits travel into downtown Missoula, while the last exit serves East Missoula. US 12 joins I-90 and MT 200 exits to the north of the highway outside of Missoula, paralleling the Blackfoot River as I-90 continues east, following and then intersecting Montana Secondary Highway 210 (S-210) in Clinton. The Bearmouth rest area, 142.8 mi (229.8 km) from the Idaho border, is intersected before crossing the Missoula–Granite County border.[2][3][4]

After entering Granite County, I-90 has an interchange with an access road to the Garnet Back Country Byway,[5] providing access to the Garnet Range on the west slope of the Rocky Mountains. The highway passes north of the Lolo National Forest while headed easterly. The highway continues through northern Granite county, intersecting MT 1 before exiting the county entering Powell County. Thirteen miles (29.92 km) after entering the county, I-90 intersects MT 272, which clips the eastern segment of the Lolo National Forest, before the seasonal Gold Creek rest area is intersected.[2] Garrison is northeast of the highway as US 12 ends its concurrency, traveling north from I-90 towards the state capital of Helena. I-90 turns south, paralleling former Northern Pacific Railway trackage,[6] before intersecting S-275 and the county seat, Deer Lodge. Continuing south, Dempsey is the final city intersected by I-90 before entering Deer Lodge County.[3][4]

Deer Lodge, Silver Bow and Jefferson counties[edit]

Interstate 90 bisects the northern tip of Deer Lodge County, in a southwesterly direction. Galen and S-273 are intersected, before the highway passes west of the Warm Springs State Wildlife Management Area. After passing the wildlife management area, the highway passes by Warm Springs and MT 48. Just northwest of the Deer Lodge–Silver Bow County border, I-90 intersects MT 1.[3][4]

Fairmont Hot Springs, accessible via S-441 is the first exit in Silver Bow County on I-90, as the highway starts to turn back towards the east. Ramsey is located in the southwest corner of the interchange where I-15 becomes concurrent with I-90 through Butte. On the western edge of Butte, I-115 continues east into town, as I-15/90 turns southeast, bypassing most of downtown Butte. An interchange with MT 2 serves the Bert Mooney Airport before I-15/90 split just east of Butte, with I-15 continuing north over the Continental Divide over the 6,368-foot (1,941 m) high Elk Park Pass, which straddles the Silver Bow–Jefferson County border. I-90 heads south then east, also entering Jefferson County, passing over the divide at Homestake Pass which is 6,375-foot (1,943 m) high. Jefferson County has interchanges with S-399 east of Pipestone and S-359 east of Cardwell before meeting the Jefferson–Broadwater County border.[3][4]

Broadwater, Gallatin and Park counties[edit]

I-90 through Bozeman Pass

There is only one exit along I-90 in Broadwater County, linking MT 2 in the south and US 287 north of the highway before crossing the Broadwater–Gallatin County border at the Missouri River. I-90 parallels S-205, bypassing the towns of Trident, Logan, Manhattan and Belgrade on the north of the highway. MT 85 travels south from I-90 in Belgrade, providing access to Bozeman Hot Springs. The highway then enters the city of Bozeman, the county seat, and intersects and becomes concurrent with US 191. Intersecting and traveling north from I-90 is MT 86 providing access to Bridger Bowl Ski Area. I-90 exits the county at the Gallatin–Park County border at 5,760-foot (1,760 m) high Bozeman Pass. US 89 intersects I-90 in the county seat of Livingston, and passing over the Yellowstone River. The highway continues northeasterly, paralleling the river, intersecting S-295 before crossing the Park–Sweet Grass County border.[3][4]

Sweet Grass and Stillwater counties[edit]

West of Park City facing west

Still paralleling the Yellowstone River, I-90 travels northwest intersecting S-298 and US 191 in the county seat of Big Timber. The highway turns back southeast, passing south of Greycliff and the Greycliff rest area, located 380.9 mi (613.0 km) from the Idaho border.[2] The highway passes through the Sweet Grass–Stillwater County border just west of Reed Point. After passing into Stillwater County, I-90 crosses over the river, and enters the county seat of Columbus, intersecting MT 78 south of the highway and S-306 on the north side of the highway. The highway is titled the Robert E. Ewing Jr. Memorial Highway between mileposts 410 and 424.[7] I-90 intersects the Columbus rest area, 418.8 mi (674.0 km) from the Idaho border,[2] followed by Park City before exiting Stillwater County.[3][4]

Yellowstone and Big Horn counties[edit]

US 212 becomes concurrent with I-90 just east of Laurel before entering the county seat of Billings. I-90 Bus. passes into town as the main freeway travels south of Billings and bisects Billings Heights and Lockwood intersecting MT 3 and US 87, which joins the I-90/US 212 concurrency. On the extreme eastern end of Billings, the three highways intersect the beginning of I-94, which heads northeast towards North Dakota, while I-90 turns southeast into Big Horn County. Immediately after entering Big Horn County the three highways pass the seasonal Hardin rest area.[2] Entering Hardin, the county seat, the three highways intersect S-313 and MT 47. S-313 provides access to Yellowtail Dam, while MT 47 connects back to I-94. After exiting Hardin, I-90 turns south, entering the Crow Indian Reservation and intersects S-384, before reaching Crow Agency. Crow Agency is home to the Little Bighorn Battlefield National Monument and Reno–Benteen Battlefield Memorial, which are passed after US 212 departs to the east. Continuing south, I-90/US 87 parallels S-451 and the Little Bighorn River, passing by Garryowen, Benteen, Lodge Grass and Wyola before exiting the state of Montana and entering Sheridan County, Wyoming.[3][4]

Expansion of the Billings area corridor[edit]

The 2012 Billings area I-90 corridor planning study recommends many improvements to the corridor from Laurel through Lockwood, Among the improvements recommended are construction of a new east and westbound bridges over the Yellowstone River each bridge having three to four traffic lanes. Also recommended are construction of additional eastbound and additional westbound traffic lanes from Shiloh to Johnson Lane and reconstruction and widening of many of the bridges, interchanges and on-off ramps along the corridor at a cost of 114 million dollars.[8]


Old style I-90 shield

Until 1995 in Montana near the Idaho border, I-90 was not a divided highway for a few stretches, having only a narrow paved median. From 1995 until 1999, the daytime maximum speed limit in Montana was "reasonable and prudent"; it is now 75 miles per hour (120 km/h). On I-90, at Exit 0 (right on the MT/ID border) is the Lookout Pass Ski Area, one exit east of there is the Hiawatha Trail (rails-to-trails).

Interstate 90 replaced US 10 between Livingston and the Idaho border,[9] and before that, the Yellowstone Trail.[10]

Exit list[edit]

County Location mi km Exit Destinations Notes
Mineral   0.000 0.000 I‑90 west Continuation into Idaho
  0 Lookout Pass
  5 Taft Area
  10 Saltese
  16 Haugan
  18 De Borgia
  22 Henderson
  25 Drexel
  26 Ward Creek Road Eastbound exit and entrance
  30 Two Mile Road
  33 MT 135 – St. Regis
  37 Sloway Area
  43 Dry Creek Road
Superior 47 S-257 – Superior
  55 Lozeau, Quartz
  61 Tarkio
  65 Crystal Springs
  66 Fish Creek Road
  70 Cyr Westbound exit and eastbound entrance
Alberton 75 I‑90 Bus. east – Alberton
Missoula   77 I‑90 Bus. west / S-507 (Petty Creek Road) – Alberton
  82 Nine Mile Road
  85 Huson
  89 Frenchtown
  96 US 93 north / MT 200 west – Kalispell West end of US 93 / MT 200 overlap
  99 Airway Boulevard
Missoula 101 I‑90 Bus. east / US 93 south (Reserve Street) – Hamilton East end of US 93 overlap
104 Orange Street
105 I‑90 Bus. west / US 12 west (Van Buren Street) West end of US 12 overlap
107 East Missoula
  109 MT 200 east – Bonner, Great Falls East end of MT 200 overlap
  113 Turah
  120 Clinton
  126 Rock Creek Road
  130 Beavertail Road
Granite   138 Bearmouth Area
Drummond 153 MT 1 – Drummond, Philipsburg Eastbound exit and westbound entrance
154 To MT 1 – Drummond, Philipsburg Westbound exit and eastbound entrance
Powell   162 Jens
  166 Gold Creek
  170 Phosphate
  174 US 12 east – Garrison, Helena East end of US 12 overlap; Eastbound exit and westbound entrance
  175 To US 12 east – Garrison, Helena No westbound entrance
  179 Beck Hill Road
Deer Lodge 184 I‑90 Bus. east – Deer Lodge
  187 I‑90 Bus. west – Deer Lodge No westbound entrance
  195 Racetrack
Deer Lodge   197 S-273 – Galen
  201 Warm Springs
  208 MT 1 – Anaconda, Opportunity
Silver Bow   211 S-441 – Gregson, Fairmont, Hot Springs
  216 Ramsay
  219 I‑15 south – Dillon, Idaho Falls West end of I-15 overlap (Exits in the I-15 overlap are signed as I-15)
  222 Rocker
  224 I‑115 east (I-15 Bus. north, I-90 Bus. east) – City Center Eastbound exit and westbound entrance
Butte 226 Montana Street
227 I‑15 Bus. south / I‑90 Bus. west (Harrison Avenue, MT 2) Signed as exits 127A (south) and 127B (north) eastbound
  227 I‑15 north – Helena East end of I-15 overlap
  228 Continental Drive
  233 Homestake
Jefferson   241 Pipestone
Whitehall 249 MT 55 to MT 69 – Whitehall
  256 S-359 – Cardwell, Boulder
  267 Milligan Canyon Road
Broadwater   274 US 287 – Helena, Ennis
Gallatin   278 MT 2 / S-205 – Three Forks, Trident
  283 Logan, Trident
  288 S-288 to S-346 – Manhattan, Amsterdam
Belgrade 298 MT 85 / S-291 – Amsterdam, Belgrade, West Yellowstone
Bozeman 305 S-412 (North 19th Avenue) / Springhill Road
306 I‑90 Bus. east / S-205 (North 7th Avenue) to US 191 south
309 I‑90 Bus. south / US 191 (Main Street) West end of US 191 overlap
  313 Bear Canyon Road
  316 Trail Creek Road
  319 Jackson Creek Road
  324 Ranch Access
Park   330 I‑90 Bus. east – Livingston
Livingston 333 US 89 south – Yellowstone National Park, Livingston City Center West end of US 89 overlap
  337 I‑90 Bus. west – Livingston
  340 US 89 north – White Sulphur Springs East end of US 89 overlap
  343 Mission Creek Road
  350 East End Access
  352 Ranch Access
Sweet Grass   354 S-563 – Springdale
  362 De Hart
  367 I‑90 Bus. east / US 191 north – Big Timber, Harlowton East end of US 191 overlap
  370 I‑90 Bus. west to US 191 north – Big Timber, Harlowton
  377 Greycliff
  384 Bridger Creek Road
Stillwater   392 Reed Point
  396 Ranch Access
  400 Springtime Road
  408 MT 78 – Columbus
  426 Park City
Yellowstone Laurel 433 I‑90 Bus. east – West Laurel Eastbound exit and westbound entrance
434 US 212 west / US 310 – Laurel, Red Lodge West end of US 212 overlap
437 I‑90 Bus. west / South Frontage Road – East Laurel
Billings 443 Zoo Drive, Shiloh Road
446 I‑90 Bus. east / King Avenue West, Mullowney Lane – West Billings
447 South Billings Boulevard – Billings City Center
450 MT 3 (27th Street) – Billings City Center
452 I‑90 Bus. west / US 87 north – Roundup, Billings Heights, Lockwood West end of US 87 overlap
455 Johnson Lane – Lockwood
456 I‑94 east – Miles City, Bismarck I-94 exit 0
  462 Pryor Creek Road
  469 Arrow Creek Road
Big Horn   478 Fly Creek Road
  484 Frontage Road – Toluca
Hardin 495 I‑90 Bus. east / MT 47 – Hardin City Center
  497 I‑90 Bus. west (Third Street) – Hardin
  503 Dunmore
  509 Crow Agency
  510 US 212 east – Little Bighorn Battlefield, Broadus East end of US 212 overlap
  514 Garryowen
  530 S-463 – Lodge Grass
  544 Wyola
  549 Aberdeen
  551.68 887.84 I-90 east / US 87 south Continuation into Wyoming
1.000 mi = 1.609 km; 1.000 km = 0.621 mi


Route map: Bing

  • Meeks, Harold (November 2000). On the road to Yellowstone: the Yellowstone Trail and American highways, 1900–1930. Missoula, Mont,: Pictoral Histories Publishing Company, Inc. ISBN 1-57510-079-7. 
  1. ^ "Table 1: Main Routes of the Dwight D. Eisenhower National System Of Interstate and Defense Highways". Route Log and Finder List. Federal Highway Administration. October 31, 2002. Retrieved November 8, 2010. 
  2. ^ a b c d e f g Montana Rest Areas (Map). Cartography by Google, Inc. Montana Department of Transportation. Retrieved November 8, 2010. 
  3. ^ a b c d e f g h i The Road Atlas (Map). 1 in ˜ 30 mi. Cartography by Rand McNally. Rand McNally. 2009. p. 60–61. ISBN 978-0-528-94219-8. 
  4. ^ a b c d e f g h i Montana Highway Map (Map). Montana Department of Transportation. 2009. 
  5. ^ "Garnet Back Country Byway". National Scenic Byways Program. Federal Highway Administration. Retrieved November 9, 2010. 
  6. ^ Helena Quadrangle (Map). 1:250,000. United States Geological Survey. April 1903. Retrieved November 9, 2010. 
  7. ^ "60-1-213. Robert E. Ewing Jr. memorial highway.". Montana Code Annotated 2009. Montana Legislature. 2007. Retrieved November 10, 2010. 
  8. ^ "BILLINGS AREA I-90 CORRIDOR PLANNING STUDY". Retrieved 2013-01-29. 
  9. ^ Meeks, p. 127
  10. ^ Junior Road Map – Montana (Map). Rand McNally. 1926. 

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