U.S. Route 10 in Montana

U.S. Highway 10N
U.S. Highway 10N
Length	112 mi (180 km)
Existed	November 11, 1926–1959

U.S. Highway 10
U.S. Highway 10
Route information
	Maintained by MDT
Length	700 mi (1,100 km)
Existed	November 11, 1926–1986
Major junctions
West end	US 93 / MT 200 in Wye
	I-15 in Butte; US 191 in Bozeman; US 89 in Livingston; US 191 in Big Timber; US 212 / US 310 in Laurel; I-90 / US 87 / US 212 in Lockwood; US 12 in Miles City;
East end	I-94 / US 10 near Beach, North Dakota
Highway system

U.S. Route 10, also U.S. Highway 10 (US 10) was a United States Numbered Highway in the state of Montana from 1926 to 1986. It was replaced with Interstate 90 (I-90) and I-94 as well as their respective business routes. It was the longest segment of US 10 in one state.

Route description[]

US 10 in Montana started on the Idaho border in the Lookout Pass. It traveled east to Wye and intersected with US 93 there. It then spilt from Interstate 90 and traveled east to Missoula. East of Missoula, US 10 ran parallel to I-90 until exit number 120, where it would then run concurrently with I-90.

History[]

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.^[2]

US 10 was one of the first US Highways established in 1926. Over time, it was slowly replaced by I-90 and I-94 after the Interstate Highway System was introduced in 1956. The new Interstates took over US 10's right of way, and in 1986, US 10 was completely decommissioned in Montana. Many sections of the former route that the Interstates did not replace are now either signed as Interstate 90 Business, Interstate 94 Business or simply "Old U.S. Highway 10" or some derivative of it.

US 10N[]

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.

Decommissioning[]

In the 1960s, 70s, and 80s, Montana upgraded US 10 to Interstate standards. Towards the end of its existence in Montana, US 10 ran concurrently with I-90 and I-94 for the majority of its route.^[3] In 1986, Montana and North Dakota truncated US 10 to its current terminus in West Fargo, North Dakota, and also decommissioned US 10A.^[4] After US 10 was decommissioned, Montana created State Highway 2 to replace a portion of former US 10 from Butte to Three Forks. Montana Highway 1 was created to replace former US 10A.

Major intersections[]

County	Location	Destinations	Notes
Missoula	Wye	US 93 north / MT 200 west – Ravalli, Sandpoint, Idaho	US 10 splits from I-90
	Missoula	US 93 / I-90 BL west – Stevensville	Western end of I-90 BL concurrency
		I-90 BL east / MT 200 west	Eastern end of I-90 BL concurrency; western end of MT 200 concurrency
		I-90 / US 12
		MT 200 east – Lincoln	Eastern end of MT 200 concurrency
	Clinton	I-90 / US 12	US 10 merges with I-90
Granite	Drummond	US 10 Alt. south – Anaconda	US 10 briefly splits from I-90
Powell	Garrison	US 12 east – Helena	Eastern end of US 12 concurrency
	Deer Lodge	I-90 BL	US 10 splits from I-90; western end of I-90 BL concurrency
	Deer Lodge	I-90	Eastern end of I-90 BL concurrency
	Anaconda	US 10 Alt. north
Silver Bow	Butte	I-15 south – Dillon	Western end of I-15 concurrency
		I-115 / I-15 BL / I-90 BL	Eastern end of I-15/90 concurrency; western end of I-15/I-90 BL concurrency
		I-15 / I-90	Eastern end of I-90 BL concurrency
Gallatin	Three Forks	US 287 – Helena, Yellowstone National Park	Western end of US 287 concurrency
	Three Forks Junction	US 287	Eastern end of US 287 concurrentcy
	Three Forks	I-90
	Bozeman	I-90	US 10 merges with I-90
	Bozeman	US 191	Western end of US 191 concurrency
Park	Livingston	US 89	Western end of US 89 concurrency
Park	Livingston	US 89	Eastern end of US 89 concurrency
Sweet Grass	Big Timber	US 191	Eastern end of US 191 concurrency; US 10 splits from I-90
	Big Timber	I-90
	Greycliff	I-90	US 10 merges with I-90
Yellowstone	Laurel	US 212 / US 310	Western end of US 212 concurrency
	Billings	I-90 BL	US 10 splits from I-90
		US 87	Western end of US 87 concurrency
		I-90	US 10 and US 87 merge with I-90
	Lockwood	I-90 / I-94 / US 87	I-90 and US 87 continue south; US 10 continues east with I-94
Rosebud	Forsyth	US 12	Western end of US 12 concurrency
Custer	Miles City	I-94 BL	Western end of I-94 BL concurrency; Eastern end of US 12 concurrency; US 10 splits from I-94
Custer	Miles City	I-94 / US 12	US 10 merges with I-94
Dawson	West Glendive	I-94 BL	US 10 splits from I-94; western end of I-94 BL concurrency
	West Glendive	MT 200S
	Glendive	MT 16
	Glendive	I-94	US 10 merges with I-94; Eastern end of I-94 BL concurrency
Wibaux	Wibaux	I-94 / US 10	Continuation into North Dakota
1.000 mi = 1.609 km; 1.000 km = 0.621 mi Concurrency terminus

References[]

^ ^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.
^ "U.S. Highway 10". Montana's Historic Landscapes. May 25, 2017. Retrieved April 22, 2021.
^ H.M Gousha Company (1985). Montana Highway Map 1985-86 (Map). Montana Promotion Division. Retrieved May 3, 2021.
^ 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.

[USH-1] 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] "U.S. Highway 10". Montana's Historic Landscapes. May 25, 2017. Retrieved April 22, 2021.

[3] H.M Gousha Company (1985). Montana Highway Map 1985-86 (Map). Montana Promotion Division. Retrieved May 3, 2021.

[4] 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.

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