U.S. Route 10 in Montana

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U.S. Highway 10

Route information
Maintained by MDT
Length700 mi (1,100 km)
ExistedNovember 11, 1926[1]–June 9, 1986[2]
Major junctions
West end US 93 / MT 200 in Wye
Major intersections
East end I-94 / US 10 near Beach, North Dakota
CountryUnited States
Highway system
MT 7 US 12

U.S. Route 10, later U.S. Highway 10, (US 10) was a United States Numbered Highway in the state of Montana from 1926 to 1986. It was mostly replaced with Interstate 90 (I-90) and I-94; sections in major city centers were replaced by business routes and state highways. It was the longest segment of US 10 in one state.

Route description

US 10 in Montana started on the Idaho border in Lookout Pass. As it traveled through the mountains, it traveled through several small towns, including St. Regis, where it intersected Montana Highway 461 (MT 461). From here, it continued east toward Missoula. In the Missoula area, US 10 would intersect US 10A (later MT 200), US 93, US 12, and MT 20 (later MT 200). The route within Missoula still exists and is signed as I-90 Business (I-90 Bus.). US 10 and US 12 ran concurrently east of Missoula until US 12 split off in Garrison. An alternate route (MT 1) split from US 10 in Drummond and rejoined US 10 east of Anaconda. After leaving Anaconda, US 10 would continue to travel east toward Butte. Shortly before entering Butte, US 10 would intersect US 91 (later I-15) and US 91 would travel concurrently with US 10 into downtown Butte.


Before the establishment of the United States Numbered Highway System, a transcontinental road called the Yellowstone Trail ran through Montana. This trail overlapped much of what would become US 10 and later I-90. US 10 completely replaced the Yellowstone Trail in Montana by 1930.[3]

US 10 was one of the first U.S. Highways established in 1926. Over time, it was slowly upgraded to freeway standards after the Interstate Highway System was introduced in 1956. Eventually, the majority of US 10 (except a section later designated MT 2) ran concurrently with the I-90 and I-94. In 1986, the US 10 designation was completely decommissioned in Montana.[2] Many sections of the former route that were not upgraded to freeway standards are now either signed as I-90 Bus., I-94 Bus., as a Montana Secondary Highway, or simply "Old U.S. Highway 10" or some derivative of it.

US 10N

U.S. Highway 10N

Length112 mi (180 km)
ExistedNovember 11, 1926[1]–1959

Until 1959, US 10 split into two sections. US 10N was replaced by MT 287 and US 12. US 10S became the mainline US 10 route after US 10N was decommissioned in 1959.


In 1977, US 10 in Idaho was decommissioned from the intersection with US 95 Alternate east of Coeur d'Alene, Idaho, to intersection with US 93/MT 200 in Wye.[4] In 1986, Montana and North Dakota truncated US 10 to its current terminus in West Fargo, North Dakota, and also decommissioned US 10A.[2] After US 10 was decommissioned, Montana created MT 2 to replace a portion of former US 10 from Butte to Three Forks. MT 1 was created to replace former US 10A from Drummond to Anaconda.

Major intersections

This list follows the final non-freeway alignment in 1960.[5]

US 10 west – Coeur d'Alene, Idaho
Continuation into Idaho
St. Regis S-461 to US 10A – ParadiseSouthern terminus of S-461

US 93 north / US 10A west – Ravalli, Sandpoint, Idaho
Eastern terminus of US 10A / Western terminus of US 93 concurrency

US 93 south / US 12 east – Stevensville
Eastern end of US 93 concurrency / Western end of US 12 concurrency / Western terminus of US 12
MT 20 east – Great Falls
US 10A east – Anaconda
US 12 east – Helena
Eastern end of US 12 concurrency
Deer LodgeWarm Springs MT 48
US 10A west
Silver BowButte
US 91 south – Dillon
Western end of US 91 concurrency

US 91 north – Helena
Eastern end of US 91 concurrency
MT 41 south – Twin Bridges
GallatinThree Forks
MT 287 south – Yellowstone National Park
Western end of MT 287 concurrency

MT 287 north – Helena
Eastern end of MT 287 concurrency
Bozeman US 191Northern terminus of US 191
US 89 south – Yellowstone National Park
Western end of US 89 concurrency

US 89 north – Great Falls
Eastern end of US 89 concurrency
Sweet GrassBig Timber MT 19

US 212 west / US 310 east / S-789
Western end of US 212 concurrency
Billings MT 3

US 87 south
Southern end of US 87 concurrency

US 87 north
Northern end of US 87 concurrency
RosebudForsyth US 12Western end of US 12 concurrency / eastern terminus of US 312
CusterMiles City MT 22
US 212Northern terminus of US 212

US 12 east – Baker
Eastern end of US 12 concurrency
DawsonWest Glendive MT 20S
Glendive MT 16
US 10 east – Dickinson, North Dakota
Continuation into North Dakota
1.000 mi = 1.609 km; 1.000 km = 0.621 mi

Related routes


  1. ^ a b Bureau of Public Roads & American Association of State Highway Officials (November 11, 1926). United States System of Highways Adopted for Uniform Marking by the American Association of State Highway Officials (Map). 1:7,000,000. Washington, DC: United States Geological Survey. OCLC 32889555. Retrieved November 7, 2013 – via Wikimedia Commons.
  2. ^ a b c Special Committee on U.S. Route Numbering (June 9, 1986). "Route Numbering Committee Agenda" (Report). Washington, DC: American Association of State Highway and Transportation Officials. p. 561. Retrieved April 28, 2021 – via Wikisource.
  3. ^ "U.S. Highway 10". Montana's Historic Landscapes. May 25, 2017. Retrieved April 22, 2021.
  4. ^ Special Committee on U.S. Route Numbering (July 6, 1977). "Route Numbering Committee Agenda" (PDF) (Report). Washington, DC: American Association of State Highway and Transportation Officials. p. 485. Retrieved June 26, 2022 – via Wikimedia Commons.
  5. ^ Map Of The Montana State Highway System (PDF) (Map). 1:22. Cartography by Randy McNally. Montana State Highway Commission. Retrieved April 21, 2023.