Interstate 90 in Montana
Encyclopedia
Interstate 90 in Montana (I-90) is a portion of the east–west transcontinental Interstate 90
Interstate 90
Interstate 90 is the longest Interstate Highway in the United States at . It is the northernmost coast-to-coast interstate, and parallels US 20 for the most part. Its western terminus is in Seattle, at Edgar Martinez Drive S. near Safeco Field and CenturyLink Field, and its eastern terminus is in...

, which links Seattle, Washington
Seattle, Washington
Seattle is the county seat of King County, Washington. With 608,660 residents as of the 2010 Census, Seattle is the largest city in the Northwestern United States. The Seattle metropolitan area of about 3.4 million inhabitants is the 15th largest metropolitan area in the country...

 to Boston, Massachusetts. The portion in the U.S. state
U.S. state
A U.S. state is any one of the 50 federated states of the United States of America that share sovereignty with the federal government. Because of this shared sovereignty, an American is a citizen both of the federal entity and of his or her state of domicile. Four states use the official title of...

 of Montana
Montana
Montana is a state in the Western United States. The western third of Montana contains numerous mountain ranges. Smaller, "island ranges" are found in the central third of the state, for a total of 77 named ranges of the Rocky Mountains. This geographical fact is reflected in the state's name,...

 is 551.68 miles (887.8 km) long, linking fourteen counties through central and southern Montana.

Mineral County

Interstate 90 enters Montana and Mineral County
Mineral County, Montana
-Demographics:As of the census of 2000, there were 3,884 people, 1,584 households, and 1,067 families residing in the county. The population density was 3 people per square mile . There were 1,961 housing units at an average density of 2 per square mile...

 from Shoshone County
Shoshone County, Idaho
Shoshone County is a county located in the U.S. state of Idaho. The county was established in 1864, named for the Native American Shoshone tribe. The population was 12,765 at the 2010 census. Shoshone County is commonly referred to as the Silver Valley, due to its century-old mining history...

, Idaho
Idaho
Idaho is a state in the Rocky Mountain area of the United States. The state's largest city and capital is Boise. Residents are called "Idahoans". Idaho was admitted to the Union on July 3, 1890, as the 43rd state....

 over the 4725 feet (1,440.2 m) high Lookout Pass
Lookout Pass
Lookout Pass is a mountain pass in the Rocky Mountains of the northwestern United States. The pass, in the Coeur d'Alene Mountains of the Bitterroot Range, is on the border between Idaho and Montana, traversed by Interstate 90 at an elevation of 4710 feet above sea level.Lookout Pass is the...

, which traverses the Coeur d'Alène Mountains
Coeur d'Alene Mountains
The Coeur d'Alene Mountains are the northwestern-most portion of the Bitterroot Range, part of the Rocky Mountains, located in the northern Idaho and westernmost Montana in the Western United States....

 of the Bitterroot Range
Bitterroot Range
The Bitterroot Range runs along the border of Montana and Idaho in the northwestern United States. The range spans an area of 62,736 square kilometers  and is named after the bitterroot , a small pink flower that is the state flower of Montana.- History :In 1805, the Corps of Discovery,...

, and immediately has its first interchange
Interchange (road)
In the field of road transport, an interchange is a road junction that typically uses grade separation, and one or more ramps, to permit traffic on at least one highway to pass through the junction without directly crossing any other traffic stream. It differs from a standard intersection, at which...

, a partial cloverleaf serving extreme northwest Mineral County. The highway continues southeasterly through woodlands, paralleling the St. Regis River
St. Regis River (Montana)
The St. Regis River is a tributary of the Clark Fork of the Columbia River in Montana in the USA. It begins at Lookout Pass on the Idaho/Montana border, flows east and ends west of St. Regis, Montana at the confluence with the Clark Fork. Its drainage is . The record high flow for the St...

, before meeting the Dena Mora (Lookout Pass) rest area
Rest area
A rest area, travel plaza, rest stop, or service area is a public facility, located next to a large thoroughfare such as a highway, expressway, or freeway at which drivers and passengers can rest, eat, or refuel without exiting on to secondary roads...

 4.7 mi (7.6 km) east of the Idaho–Montana border. About a 1/2 mi from the rest stop is a diamond interchange
Diamond interchange
A diamond interchange is a common type of road junction, used where a freeway crosses a minor road. The freeway itself is grade-separated from the minor road, one crossing the other over a bridge...

, serving a small minor road into the St. Joe National Forest
St. Joe National Forest
The St. Joe National Forest is a U.S. National Forest located in the Idaho panhandle and is one of three forests that are aggregated into the Idaho Panhandle National Forest . In descending order of land area St. Joe National Forest is located in parts of Shoshone, Latah, Clearwater, and Benewah...

 in Idaho. The highway continues, winding through the woodlands until another diamond interchange, serving the small unincorporated community
Unincorporated area
In law, an unincorporated area is a region of land that is not a part of any municipality.To "incorporate" in this context means to form a municipal corporation, a city, town, or village with its own government. An unincorporated community is usually not subject to or taxed by a municipal government...

 of Saltese
Saltese, Montana
Saltese is an unincorporated community in Mineral County, Montana, United States. Located at , Saltese lies an altitude of 3,366 feet ....

. 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
Haugan, Montana
Haugan is an unincorporated community in Mineral County, Montana, United States. Haugan is situated east of the Idaho border and west of Missoula on Interstate 90 at the Haugan Exit #16....

.

Two miles (3.22 km) after Haugan, I-90 intersects the census-designated place
Census-designated place
A census-designated place is a concentration of population identified by the United States Census Bureau for statistical purposes. CDPs are delineated for each decennial census as the statistical counterparts of incorporated places such as cities, towns and villages...

 (CDP) of De Borgia
De Borgia, Montana
De Borgia is a census-designated place in Mineral County, Montana, United States. The population was 69 at the 2000 census.-Geography:De Borgia is located at ....

, continuing southeasterly, intersecting several minor roads, before reaching the CDP of St. Regis
St. Regis, Montana
St. Regis is a census-designated place in Mineral County, Montana, United States. The population was 315 at the 2000 census.-Geography:St...

 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
Clark Fork (river)
The Clark Fork is a river in the U.S. states of Montana and Idaho, approximately long. The largest river by volume in Montana, it drains an extensive region of the Rocky Mountains in western Montana and northern Idaho in the watershed of the Columbia River, flowing northwest through a long...

 river. Superior
Superior, Montana
Superior is a town in and the county seat of Mineral County, Montana, United States. The population was 893 at the 2000 census. Superior was named after its founders' hometown of Superior, Wisconsin in 1869...

, the county seat
County seat
A county seat is an administrative center, or seat of government, for a county or civil parish. The term is primarily used in the United States....

, is intersected before the highway turns south through the Quartz Flats rest area, located 58.2 mi (93.7 km) from the Idaho border. After leaving the rest area, the highway straightens out, heading easterly. The highway continues east before exiting the county, just south of Alberton
Alberton, Montana
Alberton is a town in Mineral County, Montana, United States. The population was 374 at the 2000 census. It was named for Albert J. Earling, president of the Chicago, Milwaukee, St. Paul and Pacific Railroad. Alberton was the location of a major chlorine chemical release in 1996...

.

Missoula, Granite and Powell Counties

Entering Missoula County
Missoula County, Montana
-National protected areas:*Bitterroot National Forest *Flathead National Forest *Lolo National Forest *Rattlesnake National Recreation Area-Demographics:...

, the highway intersects Alberton
Alberton, Montana
Alberton is a town in Mineral County, Montana, United States. The population was 374 at the 2000 census. It was named for Albert J. Earling, president of the Chicago, Milwaukee, St. Paul and Pacific Railroad. Alberton was the location of a major chlorine chemical release in 1996...

, before continuing easterly through Hudson and MT 263. The highway continues southeast before intersecting the concurrent
Concurrency (road)
A concurrency, overlap, or coincidence in a road network is an instance of one physical road bearing two or more different highway, motorway, or other route numbers...

 highways U.S. Route 93 (US 93) and MT 200
Montana Highway 200
Highway 200 in the U.S. State of Montana is a route running westerly covering the entire state of Montana, from the starting point of ND 200 near Fairview, Montana to ID 200, near Heron, Montana...

, which join I-90 from the west. The three highways continue into the county seat of Missoula
Missoula, Montana
Missoula is a city located in western Montana and is the county seat of Missoula County. The 2010 Census put the population of Missoula at 66,788 and the population of Missoula County at 109,299. Missoula is the principal city of the Missoula Metropolitan Area...

, where at the first exit, US 93 leaves on the western border of Missoula and travels through Orchard Homes
Orchard Homes, Montana
Orchard Homes is a census-designated place in Missoula County, Montana, United States. It is part of the 'Missoula, Montana Metropolitan Statistical Area'. The population was 5,199 at the 2000 census...

. The next two exits travel into downtown Missoula, while the last exit serves East Missoula
East Missoula, Montana
East Missoula is a census-designated place in Missoula County, Montana, United States. It is part of the 'Missoula, Montana Metropolitan Statistical Area'...

. US 12 joins I-90 and MT 200 exits to the north of the highway outside of Missoula, paralleling the Blackfoot River
Blackfoot River (Montana)
The Blackfoot River, sometimes called the Big Blackfoot River to distinguish it from the Little Blackfoot River, is a snow-fed and spring-fed river in western Montana. The Blackfoot River begins in Lewis and Clark County at the Continental Divide, 10 miles northeast of the town of Lincoln...

 as I-90 continues east, following and then intersecting Montana Secondary Highway 210 (S-210) in Clinton
Clinton, Montana
Clinton is a census-designated place in Missoula County, Montana, United States. It is part of the 'Missoula, Montana Metropolitan Statistical Area'. The CDP was named for General Sir Henry Clinton...

. The Bearmouth rest area, 142.8 mi (229.8 km) from the Idaho border is intersected before crossing the Missoula–Granite County
Granite County, Montana
-National protected areas:*Deerlodge National Forest *Lolo National Forest -Demographics:As of the census of 2000, there were 2,830 people, 1,200 households, and 784 families residing in the county. The population density was 2 people per square mile . There were 2,074 housing units at an average...

 border.

After entering Granite County, I-90 has an interchange with an access road to the Garnet Back Country Byway, providing access to the Garnet Range
Garnet Range
The Garnet Range, highest point Old Baldy Mountain, elevation , is a mountain range northeast of Drummond, Montana in Powell County, Montana....

 on the west slope of the Rocky Mountains
Rocky Mountains
The Rocky Mountains are a major mountain range in western North America. The Rocky Mountains stretch more than from the northernmost part of British Columbia, in western Canada, to New Mexico, in the southwestern United States...

. The highway passes north of the Lolo National Forest
Lolo National Forest
Lolo National Forest is located in western Montana, United States with the western boundary being the state of Idaho. The forest spans 2 million acres and includes four wilderness areas; the Scapegoat and the Bob Marshall Wilderness are partially within the forest while the Welcome Creek and...

 while headed easterly. The highway continues through northern Granite county, intersecting MT 1 before exiting the county entering Powell County
Powell County, Montana
-National protected areas:* Beaverhead-Deerlodge National Forest * Flathead National Forest * Grant-Kohrs Ranch National Historic Site* Helena National Forest * Lolo National Forest * Bob Marshall Wilderness Area...

. 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. Garrison
Garrison, Montana
Garrison is a census-designated place in Powell County, Montana, United States. The population was 112 at the 2000 census.-Geography:Garrison is located at ....

 is northeast of the highway as US 12 ends its concurrency, traveling north from I-90 towards the state capital of Helena
Helena, Montana
Helena is the capital city of the U.S. state of Montana and the county seat of Lewis and Clark County. The 2010 census put the population at 28,180. The local daily newspaper is the Independent Record. The Helena Brewers minor league baseball and Helena Bighorns minor league hockey team call the...

. I-90 turns south, paralleling former Northern Pacific Railway
Northern Pacific Railway
The Northern Pacific Railway was a railway that operated in the west along the Canadian border of the United States. Construction began in 1870 and the main line opened all the way from the Great Lakes to the Pacific when former president Ulysses S. Grant drove in the final "golden spike" in...

 trackage, before intersecting S-275 and the county seat, Deer Lodge
Deer Lodge, Montana
Deer Lodge is a city in and the county seat of Powell County, Montana, United States. The population was 3,421 at the 2000 census. The city is perhaps best known as the home of the Montana State Prison, a major local employer...

. Continuing south, Dempsey is the final city intersected by I-90 before entering Deer Lodge County
Deer Lodge County, Montana
-National protected areas:*Beaverhead National Forest *Deerlodge National Forest -Demographics:As of the census of 2000, there were 9,417 people, 3,995 households, and 2,524 families residing in the county. The population density was 13 people per square mile . There were 4,958 housing units at an...

.

Deer Lodge, Silver Bow and Jefferson Counties

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
Warm Springs, Montana
Warm Springs is a town in Deer Lodge County, Montana, United States. It is the site of the state psychiatric hospital, Montana State Hospital. The hospital was founded by the Territorial Government of Montana in 1877. The "warm springs" are located on the hospital campus. Hot water seeps from a...

 and MT 48. Just northwest of the Deer Lodge–Silver Bow County
Silver Bow County, Montana
-National protected areas:*Beaverhead National Forest *Deerlodge National Forest -Demographics:As of the census of 2000, there were 34,606 people, 14,432 households, and 8,933 families residing in the county. The population density was 48 people per square mile . There were 16,176 housing units at...

 border, I-90 intersects MT 1.

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
Butte, Montana
Butte is a city in Montana and the county seat of Silver Bow County, United States. In 1977, the city and county governments consolidated to form the sole entity of Butte-Silver Bow. As of the 2010 census, Butte's population was 34,200...

. 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
Bert Mooney Airport
Bert Mooney Airport , is a public airport located three miles southeast of the central business district of Butte, a city in Silver Bow County, Montana, United States. It is owned by the Bert Mooney Airport Authority....

 before I-15/90 split just east of Butte, with I-15 continuing north over the Continental Divide
Continental Divide
The Continental Divide of the Americas, or merely the Continental Gulf of Division or Great Divide, is the name given to the principal, and largely mountainous, hydrological divide of the Americas that separates the watersheds that drain into the Pacific Ocean from those river systems that drain...

 over the 6368 feet (1,941 m) high Elk Park Pass, which straddles the Silver Bow–Jefferson County
Jefferson County, Montana
-National protected areas:*Deerlodge National Forest *Helena National Forest -Demographics:As of the census of 2000, there were 10,049 people, 3,747 households, and 2,847 families residing in the county. The population density was 6 people per square mile . There were 4,199 housing units at an...

 border. I-90 heads south then east, also entering Jefferson County, passing over the divide at Homestake Pass
Homestake Pass
Homestake Pass is a mountain pass in the Rocky Mountains of Montana in the United States. It sits on the Continental Divide of the Americas on the border between Jefferson County, Montana and Silver Bow County, Montana, six miles south-southeast of Butte, Montana in Beaverhead-Deerlodge National...

 which is 6375 feet (1,943.1 m) high. Jefferson County has interchanges with S-399 east of Pipestone and S-359 east of Cardwell
Cardwell, Montana
Cardwell is a census-designated place in Jefferson County, Montana, United States. The population was 40 at the 2000 census. It is part of the Helena Micropolitan Statistical Area.-Geography:Cardwell is located at ....

 before meeting the Jefferson–Broadwater County
Broadwater County, Montana
-Economy:Agriculture is one of the primary industries in Broadwater County. RY Timber and Wheat Montana Bakery were the largest private employers according to the 2000 Census.-Demographics:...

 border.

Broadwater, Gallatin and Park Counties

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
Gallatin County, Montana
-National protected areas:* Gallatin National Forest * Yellowstone National Park -Demographics:As of the census of 2000, there were 67,831 people, 26,323 households, and 16,188 families residing in the county. The population density was 26 people per square mile . There were 29,489 housing units...

 border at the Missouri River
Missouri River
The Missouri River flows through the central United States, and is a tributary of the Mississippi River. It is the longest river in North America and drains the third largest area, though only the thirteenth largest by discharge. The Missouri's watershed encompasses most of the American Great...

. I-90 parallels S-205, bypassing the towns of Trident, Logan
Logan, Montana
Logan is an unincorporated community in Gallatin County, Montana, United States.-History:Logan is situated on the Gallatin River and was established in 1889 as a railroad station on the Northern Pacific and Montana...

, Manhattan
Manhattan, Montana
Manhattan is a town in Gallatin County, Montana, United States. The population was 1,396 at the 2000 census. It is part of the 'Bozeman Micropolitan Statistical Area'.-Geography:Manhattan is located at ....

 and Belgrade
Belgrade, Montana
Belgrade is a city in Gallatin County, Montana, United States. The population was 5,728 at the 2000 census.The original townsite of Belgrade was established and filed in the Gallatin County Clerk and Recorder's Office by Thomas B. Quaw, a businessman from the midwest, in July 1881...

 on the north of the highway. MT 85
Montana Highway 85
Highway 85, which is in the U.S. State of Montana, is a north–south route traversing the central Gallatin Valley. The highway's southern terminus, just north of Bozeman Hot Springs and about west of Bozeman, is a census-designated place known as "Four Corners." From Four Corners, US 191...

 travels south from I-90 in Belgrade, providing access to Bozeman Hot Springs. The highway then enters the city of Bozeman
Bozeman, Montana
Bozeman is a city in and the county seat of Gallatin County, Montana, United States, in the southwestern part of the state. The 2010 census put Bozeman's population at 37,280 making it the fourth largest city in the state. It is the principal city of the Bozeman micropolitan area, which consists...

, the county seat, and intersects and becomes concurrent with US 191. Intersecting and traveling north from I-90 is MT 86
Montana Highway 86
Highway 86 in the U.S. State of Montana is a route running in a northerly direction from the city of Bozeman to an intersection with U.S. Route 89 north of the town of Wilsall, a distance of approximately...

 providing access to Bridger Bowl Ski Area
Bridger Bowl Ski Area
Bridger Bowl is a ski area near Bozeman, Montana, serving locals and students of Montana State University.Located north of Bozeman in the Bridger Range of southern Montana, Bridger is a locally owned non-profit ski area. It provides locals with affordable skiing, great terrain, and outstanding...

. I-90 exits the county at the Gallatin–Park County
Park County, Montana
Park Counties in Montana and Wyoming are among the very few pairs of counties in the United States with the same name to border each other across state lines.-National protected areas:* Custer National Forest * Gallatin National Forest...

 border at 5760 feet (1,755.6 m) high Bozeman Pass
Bozeman Pass
Bozeman Pass is a mountain pass situated approximately 13 miles east of the town of Bozeman, Montana and approximately 15 miles west of the town of Livingston, Montana, and between the Bridger and Gallatin mountain ranges....

. US 89 intersects I-90 in the county seat of Livingston
Livingston, Montana
-Geography:Livingston is located at , at an altitude of 4.501 feet .According to the United States Census Bureau, the city has a total area of , of which, of it is land and 0.38% is waters.-Climate:-Demographics:...

, and passing over the Yellowstone River
Yellowstone River
The Yellowstone River is a tributary of the Missouri River, approximately long, in the western United States. Considered the principal tributary of the upper Missouri, the river and its tributaries drain a wide area stretching from the Rocky Mountains in the vicinity of the Yellowstone National...

. The highway continues northeasterly, paralleling the river, intersecting S-295 before crossing the Park–Sweet Grass County
Sweet Grass County, Montana
-National protected areas:*Custer National Forest *Gallatin National Forest *Lewis and Clark National Forest -Demographics:As of the census of 2000, there were 3,609 people, 1,476 households, and 987 families residing in the county. The population density was 2 people per square mile...

 border.

Sweet Grass and Stillwater Counties

Still paralleling the Yellowstone River, I-90 travels northwest intersecting S-298 and US 191 in the county seat of Big Timber
Big Timber, Montana
Big Timber is a city in and the county seat of Sweet Grass County, Montana, United States. The population was 1,650 at the 2000 census.-Geography:Big Timber is located at ....

. The highway turns back southeast, passing south of Greycliff
Greycliff, Montana
Greycliff is a census-designated place in Sweet Grass County, Montana, United States. The population was 56 at the 2000 census.-Geography:Greycliff is located at ....

 and the Greycliff rest area, located 380.9 mi (613 km) from the Idaho border. The highway passes through the Sweet Grass–Stillwater County
Stillwater County, Montana
-National protected areas:*Custer National Forest *Hailstone National Wildlife Refuge*Halfbreed Lake National Wildlife Refuge-Demographics:...

 border just west of Reed Point
Reed Point, Montana
Reed Point is a census-designated place in Stillwater County, Montana, United States. The population was 185 at the 2000 census.-Geography:Reed Point is located at ....

. After passing into Stillwater County, I-90 crosses over the river, and enters the county seat of Columbus
Columbus, Montana
Columbus is a town in and the county seat of Stillwater County, Montana, United States. The population was 1,748 at the 2000 census.-History:The community originated as a stagecoach station on the Yellowstone River....

, intersecting MT 78
Montana Highway 78
Highway 78 in the U.S. State of Montana is a route running in a northerly direction from an intersection with U.S. Route 212 at the city of Red Lodge. The highway extends about to a northern terminus at the town of Columbus....

 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. I-90 intersects the Columbus rest area, 418.8 mi (674 km) from the Idaho border, followed by Park City
Park City, Montana
Park City is a census-designated place in Stillwater County, Montana, United States. The population was 870 at the 2000 census.-Geography:Park City is located at ....

 before exiting Stillwater County.

Yellowstone and Big Horn Counties

US 212 becomes concurrent with I-90 just east of Laurel
Laurel, Montana
Laurel is a city in Yellowstone County, Montana, United States. It is part of the Billings, Montana Metropolitan Statistical Area, and is located in the Yellowstone Valley, as an east-west terminal division point of the Burlington-Northern Railroad.. The population was 6,781 at the 2010 census.Both...

 before entering the county seat of Billings
Billings, Montana
Billings is the largest city in the U.S. state of Montana, and is the principal city of the Billings Metropolitan Area, the largest metropolitan area in over...

. I-90 Bus. passes into town as the main freeway travels south of Billings, 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
Interstate 94 in Montana
Interstate 94 in Montana is a portion of the east–west transcontinental Interstate 90, which links Billings, Montana to Detroit. The portion in the U.S...

, which heads northeast towards North Dakota
North Dakota
North Dakota is a state located in the Midwestern region of the United States of America, along the Canadian border. The state is bordered by Canada to the north, Minnesota to the east, South Dakota to the south and Montana to the west. North Dakota is the 19th-largest state by area in the U.S....

, while I-90 turns southeast into Big Horn County
Big Horn County, Montana
- National protected areas :* Bighorn Canyon National Recreation Area * Little Bighorn Battlefield National Monument- Economy :Coal Mining and Agriculture both play major roles in Big Horn County’s economy...

. Immediately after entering Big Horn County the three highways pass the seasonal Hardin rest area. Entering Hardin
Hardin, Montana
Hardin is a city in and the county seat of Big Horn County, Montana, United States. The population was 3,384 at the 2000 census.-Geography:Hardin is located at ....

, the county seat, the three highways intersect S-313 and MT 47. S-313 provides access to Yellowtail Dam
Yellowtail Dam
Yellowtail Dam is a dam across the Bighorn River in southwestern Montana in the United States. The mid-1960s era concrete arch dam serves to regulate the flow of the Bighorn for irrigation purposes and to generate hydroelectric power. The dam and its reservoir, Bighorn Lake, are owned by the U.S...

, while MT 47 connects back to I-94. After exiting Hardin, I-90 turns south, entering the Crow Indian Reservation
Crow Indian Reservation
The Crow Indian Reservation is the homeland of the Crow Tribe of Indians of the State of Montana in the United States. The reservation is located in parts of Big Horn, Yellowstone, and Treasure counties in southern Montana...

 and intersects S-384, before reaching Crow Agency
Crow Agency, Montana
Crow Agency is a census-designated place in Big Horn County, Montana, United States and is near the actual location for the Little Bighorn National Monument and re-enactment known as Custer's Last Stand...

. Crow Agency is home to the Little Bighorn Battlefield National Monument
Little Bighorn Battlefield National Monument
Little Bighorn Battlefield National Monument preserves the site of the June 25, 1876, Battle of the Little Bighorn, near Crow Agency, Montana, in the United States. It also serves as a memorial to those who fought in the battle: George Armstrong Custer's 7th Cavalry and a combined Lakota-Northern...

 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
Little Bighorn River
The Little Bighorn River is a tributary of the Bighorn River in the United States in the states of Wyoming and Montana. The Battle of the Little Bighorn was fought on its banks in 1876, as well as the Battle of Crow Agency in 1887....

, passing by Garryowen
Garryowen, Montana
Garryowen is a private town in Big Horn County, Montana, United States owned by Chris Kortlander. The "Townhall" currently houses a Conoco gas station and convenience store, a Subway, an arts & crafts store called "The Trading Post," and the Custer Battlefield Museum This town is currently for...

, Benteen, Lodge Grass
Lodge Grass, Montana
Lodge Grass is a town in Big Horn County, Montana, United States. The population was 510 at the 2000 census.-Geography:Lodge Grass is located at ....

 and Wyola
Wyola, Montana
Wyola is a census-designated place in Big Horn County, Montana, United States. The population was 186 at the 2000 census.-Geography:Wyola is located at ....

 before exiting the state of Montana and entering Sheridan County, Wyoming
Wyoming
Wyoming is a state in the mountain region of the Western United States. The western two thirds of the state is covered mostly with the mountain ranges and rangelands in the foothills of the Eastern Rocky Mountains, while the eastern third of the state is high elevation prairie known as the High...

.

History

Until 1995 in Montana
Montana
Montana is a state in the Western United States. The western third of Montana contains numerous mountain ranges. Smaller, "island ranges" are found in the central third of the state, for a total of 77 named ranges of the Rocky Mountains. This geographical fact is reflected in the state's name,...

 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 (33.5 m/s). 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, and before that, the Yellowstone Trail
Yellowstone Trail
The Yellowstone Trail was the first transcontinental automobile highway through the upper tier of states in the United States. It ran from Massachusetts to Seattle. It was conceived by J.W. Parmley of Ipswich, South Dakota in 1912. Originally, Parmley and his business colleagues wanted a good road...

.

Exit list

County Location Mile #
Exit number
An exit number is a number assigned to a road junction, usually an exit from a freeway. It is usually marked on the same sign as the destinations of the exit, as well as a sign in the gore....

Destinations Notes
Mineral
Mineral County, Montana
-Demographics:As of the census of 2000, there were 3,884 people, 1,584 households, and 1,067 families residing in the county. The population density was 3 people per square mile . There were 1,961 housing units at an average density of 2 per square mile...

0 Lookout Pass
5 Taft
Taft, Montana
Taft is a ghost town in Mineral County, Montana, United States. Located in the Bitterroot Range near the Idaho border. It was a thriving railroad town circa 1908, named after William H...

 Area
10 Saltese
Saltese, Montana
Saltese is an unincorporated community in Mineral County, Montana, United States. Located at , Saltese lies an altitude of 3,366 feet ....

16 Haugan
Haugan, Montana
Haugan is an unincorporated community in Mineral County, Montana, United States. Haugan is situated east of the Idaho border and west of Missoula on Interstate 90 at the Haugan Exit #16....

18 De Borgia
De Borgia, Montana
De Borgia is a census-designated place in Mineral County, Montana, United States. The population was 69 at the 2000 census.-Geography:De Borgia is located at ....

22 Henderson
25 Drexel
26 Ward Creek Road Eastbound exit and entrance
30 Two Mile Road
33
37 Sloway Area
43 Dry Creek Road
Superior
Superior, Montana
Superior is a town in and the county seat of Mineral County, Montana, United States. The population was 893 at the 2000 census. Superior was named after its founders' hometown of Superior, Wisconsin in 1869...

47
55 Lozeau, Quartz
61 Tarkio
Tarkio, Montana
Tarkio is a place in Montana, located in Mineral County.Tarkio falls in Mountain Time Zone and observes daylight saving time.Tarkio's elevation is 2,940 feet above sea level.Tarkio is approximately 40 miles outside of Missoula, MT....

66 Fish Creek Road
70 Cyr Westbound exit and eastbound entrance
Alberton
Alberton, Montana
Alberton is a town in Mineral County, Montana, United States. The population was 374 at the 2000 census. It was named for Albert J. Earling, president of the Chicago, Milwaukee, St. Paul and Pacific Railroad. Alberton was the location of a major chlorine chemical release in 1996...

75 Alberton
Alberton, Montana
Alberton is a town in Mineral County, Montana, United States. The population was 374 at the 2000 census. It was named for Albert J. Earling, president of the Chicago, Milwaukee, St. Paul and Pacific Railroad. Alberton was the location of a major chlorine chemical release in 1996...

Missoula
Missoula County, Montana
-National protected areas:*Bitterroot National Forest *Flathead National Forest *Lolo National Forest *Rattlesnake National Recreation Area-Demographics:...

77
82 Nine Mile Road
85 Huson
89 Frenchtown
Frenchtown, Montana
Frenchtown is a census-designated place in Missoula County, Montana, United States. It is part of the 'Missoula, Montana Metropolitan Statistical Area'. The population was 883 at the 2000 census...

96 West end of US 93/MT 200 overlap
99 Airway Boulevard
Missoula
Missoula, Montana
Missoula is a city located in western Montana and is the county seat of Missoula County. The 2010 Census put the population of Missoula at 66,788 and the population of Missoula County at 109,299. Missoula is the principal city of the Missoula Metropolitan Area...

101 East end of US 93 overlap
104 Orange Street
105 West end of US 12 overlap
107 East Missoula
East Missoula, Montana
East Missoula is a census-designated place in Missoula County, Montana, United States. It is part of the 'Missoula, Montana Metropolitan Statistical Area'...

109 East end of MT 200 overlap
113 Turah
120 Clinton
Clinton, Montana
Clinton is a census-designated place in Missoula County, Montana, United States. It is part of the 'Missoula, Montana Metropolitan Statistical Area'. The CDP was named for General Sir Henry Clinton...

126 Rock Creek Road
Granite
Granite County, Montana
-National protected areas:*Deerlodge National Forest *Lolo National Forest -Demographics:As of the census of 2000, there were 2,830 people, 1,200 households, and 784 families residing in the county. The population density was 2 people per square mile . There were 2,074 housing units at an average...

130 Beavertail Road
138 Bearmouth
Bearmouth, Montana
Bearmouth was a trading post for the placer mining camps of Beartown, Garnet and Coloma, located in the hills north of Bearmouth. A pioneer family named Lannen operated the gold exchange and ferry boat across the Clark Fork River....

 Area
Drummond
Drummond, Montana
Drummond is a town in Granite County, Montana, United States. The population was 318 at the 2000 census.-Geography:Drummond is located at .According to the United States Census Bureau, the town has a total area of , all of it land....

153 Eastbound exit and westbound entrance
154 Westbound exit and eastbound entrance
Powell
Powell County, Montana
-National protected areas:* Beaverhead-Deerlodge National Forest * Flathead National Forest * Grant-Kohrs Ranch National Historic Site* Helena National Forest * Lolo National Forest * Bob Marshall Wilderness Area...

162 Jens
166 Gold Creek
170 Phosphate
174 East end of US 12 overlap; eastbound exit and westbound entrance
175 No westbound entrance
179 Beck Hill Road
Deer Lodge
Deer Lodge, Montana
Deer Lodge is a city in and the county seat of Powell County, Montana, United States. The population was 3,421 at the 2000 census. The city is perhaps best known as the home of the Montana State Prison, a major local employer...

184
187 No westbound entrance
195 Racetrack
Deer Lodge
Deer Lodge County, Montana
-National protected areas:*Beaverhead National Forest *Deerlodge National Forest -Demographics:As of the census of 2000, there were 9,417 people, 3,995 households, and 2,524 families residing in the county. The population density was 13 people per square mile . There were 4,958 housing units at an...

197
201 Warm Springs
Warm Springs, Montana
Warm Springs is a town in Deer Lodge County, Montana, United States. It is the site of the state psychiatric hospital, Montana State Hospital. The hospital was founded by the Territorial Government of Montana in 1877. The "warm springs" are located on the hospital campus. Hot water seeps from a...

208
Silver Bow
Silver Bow County, Montana
-National protected areas:*Beaverhead National Forest *Deerlodge National Forest -Demographics:As of the census of 2000, there were 34,606 people, 14,432 households, and 8,933 families residing in the county. The population density was 48 people per square mile . There were 16,176 housing units at...

211
216 Ramsay
Ramsay, Montana
Ramsay is a neighborhood in Butte, Montana, United States. Located at the coordinates of N 46° 00.828 W 112° 40.644, Ramsey lies off exit 216 on Interstate 90 on the Rocker Hill above central Butte....

219 , Idaho Falls
Idaho Falls, Idaho
Idaho Falls is a city in and the county seat of Bonneville County, Idaho, United States, and the largest city in Eastern Idaho. As of the 2010 census, the population of Idaho Falls was 56,813, with a metro population of 130,374....

West end of I-15 overlap
122 Rocker
Rocker, Montana
Rocker is a suburb of Butte, Montana, United States, located at the coordinates of N 46° 24.20 W 112° 36.40. Most known for its Port of Montana transportation hub at the connection of Interstates 15 and 90, Rocker lies 3 miles west of Butte....

124  – City Center Eastbound exit and westbound entrance
Butte
Butte, Montana
Butte is a city in Montana and the county seat of Silver Bow County, United States. In 1977, the city and county governments consolidated to form the sole entity of Butte-Silver Bow. As of the 2010 census, Butte's population was 34,200...

126 Montana Street
127 Signed as exits 127A (south) and 127B (north) eastbound
227 East end of I-15 overlap
228 Continental Drive
233 Homestake
Jefferson
Jefferson County, Montana
-National protected areas:*Deerlodge National Forest *Helena National Forest -Demographics:As of the census of 2000, there were 10,049 people, 3,747 households, and 2,847 families residing in the county. The population density was 6 people per square mile . There were 4,199 housing units at an...

241 Pipestone
Whitehall
Whitehall, Montana
Whitehall is a town in Jefferson County, Montana, United States. The population was 1,044 at the 2000 census. It is part of the Helena Micropolitan Statistical Area.Newscaster Chet Huntley graduated from Whitehall High School in 1929.-Geography:...

249
256
267 Milligan Canyon Road
Broadwater
Broadwater County, Montana
-Economy:Agriculture is one of the primary industries in Broadwater County. RY Timber and Wheat Montana Bakery were the largest private employers according to the 2000 Census.-Demographics:...

274
Gallatin
Gallatin County, Montana
-National protected areas:* Gallatin National Forest * Yellowstone National Park -Demographics:As of the census of 2000, there were 67,831 people, 26,323 households, and 16,188 families residing in the county. The population density was 26 people per square mile . There were 29,489 housing units...

278
283 Logan
Logan, Montana
Logan is an unincorporated community in Gallatin County, Montana, United States.-History:Logan is situated on the Gallatin River and was established in 1889 as a railroad station on the Northern Pacific and Montana...

, Trident
288
Belgrade
Belgrade, Montana
Belgrade is a city in Gallatin County, Montana, United States. The population was 5,728 at the 2000 census.The original townsite of Belgrade was established and filed in the Gallatin County Clerk and Recorder's Office by Thomas B. Quaw, a businessman from the midwest, in July 1881...

298
Bozeman
Bozeman, Montana
Bozeman is a city in and the county seat of Gallatin County, Montana, United States, in the southwestern part of the state. The 2010 census put Bozeman's population at 37,280 making it the fourth largest city in the state. It is the principal city of the Bozeman micropolitan area, which consists...

305
306
309 West end of US 191 overlap
313 Bear Canyon Road
316 Trail Creek Road
319 Jackson Creek Road
324 Ranch Access
Park
Park County, Montana
Park Counties in Montana and Wyoming are among the very few pairs of counties in the United States with the same name to border each other across state lines.-National protected areas:* Custer National Forest * Gallatin National Forest...

330
Livingston
Livingston, Montana
-Geography:Livingston is located at , at an altitude of 4.501 feet .According to the United States Census Bureau, the city has a total area of , of which, of it is land and 0.38% is waters.-Climate:-Demographics:...

333 West end of US 89 overlap
337
340 East end of US 89 overlap
343 Mission Creek Road
350 East End Access
352 Ranch Access
Sweet Grass
Sweet Grass County, Montana
-National protected areas:*Custer National Forest *Gallatin National Forest *Lewis and Clark National Forest -Demographics:As of the census of 2000, there were 3,609 people, 1,476 households, and 987 families residing in the county. The population density was 2 people per square mile...

354
362 De Hart
367 East end of US 191 overlap
370
377 Greycliff
Greycliff, Montana
Greycliff is a census-designated place in Sweet Grass County, Montana, United States. The population was 56 at the 2000 census.-Geography:Greycliff is located at ....

384 Bridger Creek Road
Stillwater
Stillwater County, Montana
-National protected areas:*Custer National Forest *Hailstone National Wildlife Refuge*Halfbreed Lake National Wildlife Refuge-Demographics:...

392 Reed Point
Reed Point, Montana
Reed Point is a census-designated place in Stillwater County, Montana, United States. The population was 185 at the 2000 census.-Geography:Reed Point is located at ....

396 Ranch Access
400 Springtime Road
408
426 Park City
Park City, Montana
Park City is a census-designated place in Stillwater County, Montana, United States. The population was 870 at the 2000 census.-Geography:Park City is located at ....

Yellowstone
Yellowstone County, Montana
-National protected areas:* Nez Perce National Historical Park * Pompeys Pillar National Monument-Demographics:As of the census of 2000, there were 129,352 people, 52,084 households, and 34,219 families residing in the county. The population density was 49 people per square mile . There were...

433 Eastbound exit and westbound entrance
Laurel
Laurel, Montana
Laurel is a city in Yellowstone County, Montana, United States. It is part of the Billings, Montana Metropolitan Statistical Area, and is located in the Yellowstone Valley, as an east-west terminal division point of the Burlington-Northern Railroad.. The population was 6,781 at the 2010 census.Both...

434 West end of US 212 overlap
437
Billings
Billings, Montana
Billings is the largest city in the U.S. state of Montana, and is the principal city of the Billings Metropolitan Area, the largest metropolitan area in over...

443 Zoo Drive
446
447 South Billings Boulevard – Billings City Center
450
452 West end of US 87 overlap
455 Johnson Lane
456 , Bismarck
Bismarck, North Dakota
Bismarck is the capital of the U.S. state of North Dakota and the county seat of Burleigh County. It is the second most populous city in North Dakota after Fargo. The city's population was 61,272 at the 2010 census, while its metropolitan population was 108,779...

462 Pryor Creek Road
469 Arrow Creek Road
Big Horn
Big Horn County, Montana
- National protected areas :* Bighorn Canyon National Recreation Area * Little Bighorn Battlefield National Monument- Economy :Coal Mining and Agriculture both play major roles in Big Horn County’s economy...

478 Fly Creek Road
484 Frontage Road – Toluca
Hardin
Hardin, Montana
Hardin is a city in and the county seat of Big Horn County, Montana, United States. The population was 3,384 at the 2000 census.-Geography:Hardin is located at ....

495
497
503 Dunmore
509 Crow Agency
Crow Agency, Montana
Crow Agency is a census-designated place in Big Horn County, Montana, United States and is near the actual location for the Little Bighorn National Monument and re-enactment known as Custer's Last Stand...

510 East end of US 212 overlap
514 Garryowen
Garryowen, Montana
Garryowen is a private town in Big Horn County, Montana, United States owned by Chris Kortlander. The "Townhall" currently houses a Conoco gas station and convenience store, a Subway, an arts & crafts store called "The Trading Post," and the Custer Battlefield Museum This town is currently for...

530
544 Wyola
Wyola, Montana
Wyola is a census-designated place in Big Horn County, Montana, United States. The population was 186 at the 2000 census.-Geography:Wyola is located at ....

549 Aberdeen
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