List of state highways in Montana

The state highways in Montana are the state highways owned and maintained by the Montana Department of Transportation (MDT) in the US state of Montana.

Montana Highway System
Map of main highways within Montana
System information
Maintained by MDT
Formed1942[1]
Highway names
InterstatesInterstate nn (I-nn)
US HighwaysU.S. Highway n (US n)
StateMontana Highway n (MT n)
SecondarySecondary Highway nnn (S-nnnn)
System links

Montana's state highways are classified as either primary or secondary.[1] Several of Montana's state highways (both primary and secondary), or sections thereof, have also been designated as part of the National Highway System.[1]

Primary state highways

The square markers used today to identify primary Montana highways are only slightly different from their 1940s and earlier predecessors. The old markers used the word "ROUTE" above the number in big size, the route number in the middle, and the word "MONTANA" from edge-to-edge at the sign bottom.[1] The font used was similar to that used for US routes.

Number Length (mi)[2][3] Length (km) Southern or western terminus Northern or eastern terminus Formed Removed Notes
MT 1 —— US 191 near GraylingUS 10 near Sappington —— Replaced by MT 287 (now US 287)
MT 1 63.652102.438 I-90 in OpportunityI-90 in Drummond 01922-01-011922current
MT 2 63.241101.777 I-90 in ButteI-90 in Three Forks ——
MT 3 —— Idaho border near HeronUS 93 in Ravalli —— Replaced by US 10 Alt
MT 3 221.770356.904 I-90 in BillingsI-15 and US 89 in Great Falls ——
MT 4 2439 Idaho state lineMT 3 in Thompson Falls —— decommissioned when Idaho truncated SH 4 at Burke; Replaced by Forest Service Road NF-7623 (connects to Burke) and S-471
MT 5 65.573105.530 MT 13 in ScobeyND 5 in Westby ——
MT 6 —— US 10 Alternate in TownsendUS 10 in Forsyth —— Replaced by US 12
MT 7 80.585129.689 S-323 in EkalakaI-94 in Wibaux 01930-01-011930current
MT 8 —— US 87 in Crow AgencyMT 22 near Olive —— Replaced by US 212
MT 9 —— Lolo PassUS 93 at Lolo —— Replaced by S-412 (now US 12)
MT 11 —— US 89 in VaughnAlberta border at Sweetgrass —01932-01-011932 Replaced by US 91
MT 11 —— —— ——
MT 13 112.507181.062 MT 200 in CircleHwy 36 at the Saskatchewan border ——
MT 13W 5.7979.329 US 2 in Wolf PointMT 13 in Bridge Park —01994-01-011994 Replaced by MT 25
MT 14 —— US 10 at GlendiveNorth Dakota border at Fairview —— Replaced by MT 16 and MT 23N (later MT 20; now MT 200)
MT 15 —— US 87 in StanfordUS 2 in Chester —— Replaced by S-230 (now MT 80) and S-223
MT 16 152.371245.217 I-94 Bus. in GlendiveHwy 6 at the Saskatchewan border ——
MT 17 —— —— —— location unknown
MT 17 14.08222.663 US 89 near Kennedy CreekHwy 6 at the Alberta border ——
MT 18 —— US 87 in Grass RangeUS 10/MT 14 in Glendive —— Replaced by MT 20 (now MT 200) and MT 20S (now MT 200S)
MT 19 —— US 10 in Big TimberUS 2/MT 39 in Malta —— Replaced by US 191
MT 19 21.48234.572 US 87 and MT 200 near Grass RangeUS 191 near Roy ——
MT 20 —— US 10 in BonnerUS 89 near Great Falls —— Replaced by MT 200
MT 20S —— MT 20 east of CircleUS 10/I-94 Bus. in Glendive —— Replaced by MT 200S
MT 21 —— US 10 in ColumbusMT 6 at Ryegate —— Replaced by S-300 and S-306
MT 21 20.77633.436 US 287 near AugustaMT 200 in Simms ——
MT 22 —— Wyoming border at AlzadaSaskatchewan border at Port of Ophiem —— Replaced by US 212, MT 59, S-341, and MT 24
MT 23 7.52712.114 MT 16 and MT 200 near SidneyND 68 at the North Dakota border —— From 1951 to 1958, continued west to Circle
MT 23N —— —North Dakota border at Fairview —— Replaced by MT 20 (now MT 200)
MT 23S —— —ND 68 at the North Dakota border —— Replaced by MT 23
MT 24 5893 MT 37 at JenningsUS 2 in Marion ——
MT 24 134.098215.810 MT 200 near BrockwayHwy 2 at the Saskatchewan border ——
MT 24W 2.8924.654 MT 24 south of GlasgowUS 2 in Glasgow —01994-01-011994 Replaced by MT 42
MT 25 —— US 87 in BillingsUS 87 in Lewistown ——
MT 25 5.7979.329 US 2 in Wolf PointMT 13 in Bridge Park 01994-01-011994current
MT 26 —— MT 3 in Trout CreekUS 2 in Kootenai National Forest ——
MT 27 —— MT 19 in WinifredMT 29 in Big Sandy —— Replaced by S-226
MT 28 46.73475.211 MT 200 near PlainsUS 93 in Elmo 01924-01-011924current
MT 29 —— US 87/US 89 in Great FallsPort of Wildhorse —— Replaced by US 87
MT 30 —— US 12 near Miles CitySouth Dakota border near Mill Iron ——
MT 31 —— US 10 in DrummondMT 35 near Bigfork —— Replaced by S-271 and MT 83
MT 32 —— Yellowstone National Park at Silver GateUS 310 at Rockvale —— Replaced by US 212
MT 33 —— US 91/MT 20 in Wolf CreekUS 89 in Choteau —— Replaced by US 287
MT 34 —— MT 41 in Twin BridgesMT 287 in Ennis —— Replaced by rerouted MT 287
MT 35 50.66981.544 US 93 in PolsonUS 2 in Evergreen ——
MT 36 —— US 93 near Gibbons PassUS 91 in Dillon —— Replaced by MT 43 and S-278
MT 37 67.048107.903 US 2 in LibbyUS 93 in Eureka ——
MT 38 53.83586.639 US 93 in GrantsdaleMT 1 in Porters Corner 01924-01-011924current Skalkaho Highway
MT 39 —— Port of Morgan at the Saskatchewan borderHysham —— Replaced by MT 19 (later S-242) and S-245
MT 39 51.16382.339 US 212 in Lame DeerNorth of I-94 near Forsyth 01977-01-011977current
MT 40 4.5057.250 US 93 south of WhitefishUS 2 west of Columbia Falls ——
MT 41 54.51287.729 I-15 Bus. in DillonMT 2 in Vendome Station ——
MT 42 —— —— —— location unknown
MT 42 2.8924.654 MT 24 south of GlasgowUS 2 in Glasgow 01994-01-011994current
MT 43 77.462124.663 US 93 at Lost Trail PassI-15 near Divide —— Last mile near western terminus with US 93 is in Idaho.
MT 44 —— —— —— location unknown
MT 44 28.39045.689 US 93 north of DupuyerI-15 east of Valier ——
MT 45 —— MT 8 in Lame DeerUS 10 in Forsyth —— Replaced by S-315 (now MT 39)
MT 46 —— —— —— location unknown
MT 47 31.43750.593 I-90 in HardinI-94 east of Custer ——
MT 48 6.83911.006 MT 1 near AnacondaI-90 near Warm Springs ——
MT 49 —— —— —— location unknown
MT 49 11.73418.884 US 2 in East Glacier ParkUS 89 north of Kiowa ——
MT 50 —— MT 13 southeast of Wolf PointUS 2 east of Wolf Point —— Replaced by MT 13
MT 50 —— Idaho border at Raynolds PassUS 287 west of Lake Hebgen —— Replaced by MT 87
MT 55 12.99620.915 MT 41 north of Silver StarI-90 at Whitehall ——
MT 56 34.64655.757 MT 200 west of NoxonUS 2 east of Troy 01977-01-011977current
MT 59 195.389314.448 WYO 59 at the Wyoming borderMT 200 at Jordan ——
MT 64 9.03914.547 Big Sky ResortUS 191 near Big Sky Resort ——
MT 66 50.02280.503 US 191 south of LanduskyUS 2 at Fort Belknap ——
MT 68 —— I-15 south of CascadeI-15 north of Cascade ——
MT 69 38.39561.791 MT 55 at WhitehallI-15 at Boulder ——
MT 72 21.40834.453 WYO 120 at the Wyoming borderUS 310 south of Bridger 01977-01-011977current
MT 77 1.9913.204 Hot SpringsMT 28 east of Hot Springs 01977-01-011977current
MT 78 47.71476.788 US 212 at Red LodgeI-90 at Columbus 01977-01-011977current
MT 80 67.172108.103 US 87 at StanfordUS 87 at Fort Benton ——
MT 81 42.44668.310 MT 80 near Coffee CreekUS 191 at Brooks ——
MT 82 6.86211.043 US 93 north of SomersMT 35 north of Bigfork 01977-01-011977current
MT 83 91.118146.640 MT 200 at Clearwater JunctionMT 35 north of Bigfork 01977-01-011977current
MT 84 28.90446.516 US 287 in NorrisUS 191/MT 85 near Four Corners ——
MT 85 6.70410.789 US 191/MT 84 near Four CornersI-90 at Belgrade ——
MT 86 37.49860.347 US 191/I-90 Bus. in BozemanUS 89 near Wilsall ——
MT 87 8.57113.794 SH 87 at the Idaho borderUS 287 west of Quake Lake 01987-01-011987current
MT 110 —— US 10 near OpportunityUS 10 in Drummond —— Replaced by US 10 Alternate
MT 117 13.13821.144 MT 24 at Fort PeckUS 2 at Nashua ——
MT 135 21.54934.680 I-90 at St. RegisMT 200 near Paradise 01977-01-011977current
MT 141 32.46852.252 US 12 at AvonMT 200 north of Helmville 01977-01-011977current
MT 187 —— US 10 in BozemanUS 89 in Wilsall —— Replaced by S-293 (now MT 86)
MT 191 —— US 191 near GraylingUS 10 near Sappington —— Replaced by MT 1 (later MT 287, now US 287)
MT 200 706.6241,137.201 SH 200 at the Idaho border east of Cabinet, IdahoND 200 at Fairview 01967-01-011967current
MT 200S 48.67478.333 MT 200 east of CircleI-94 Bus. in Glendive 01967-01-011967current
MT 287 48.82278.571 MT 41 at Twin BridgesUS 287 at Ennis ——
MT 287A 4674 MT 287 at EnnisI-90/US 10 near Three Forks 01961-01-01196101965-01-011965 Former section of MT 287; replaced by US 287
MT 789 —— Wyoming border south of WarrenAlberta border at Sweetgrass —— Part of US 789 corridor

Secondary state highways
Main article: List of secondary highways in Montana
S-486 at Columbia Falls, August 2013

Montana's secondary system was established in 1942,[4] but secondary highways (S routes) were not signed until the 1960s.[1] S route designations first appeared on the state highway map in 1960[5] and are abbreviated as "S-nnn". Route numbers 201 and higher are, with very few exceptions, exclusively reserved for S routes. Notable exceptions include, MT 287, and the former MT 789).

The highway markers for Montana's Secondary Highways are distinctive in that the route number appears in black on a white down-pointing arrowhead.[1] (Early markers were white numbers on black arrowheads with the word Montana in the flat top of the inverted arrowhead and Secondary appearing below the route number on the shields.)

See also
  •  U.S. Roads portal

References
  1. Multimodal Planning Bureau, Rail, Transit & Planning Division (March 2017). "A Guide to Functional Classification, Highway Systems and Other Route Designations in Montana" (PDF). Montana Department of Transportation. pp. 5–6. Retrieved April 8, 2019.
  2. Montana Department of Transportation (2013). "Montana Road Log" (PDF). Helena: Montana Department of Transportation. Retrieved March 6, 2017.
  3. "Montana Off System Routes" (GIS data). Montana Department of Transportation. Retrieved April 8, 2017.
  4. "Federal-Aid Road Log" (PDF). Montana Highway Department Highway Planning Survey. Montana Highway Department. January 1, 1943. Retrieved April 7, 2019 – via Internet Archive.
  5. Montana State Highway Commission (1960). State Highway Map (PDF) (Map). Helena: Montana State Highway Commission. Retrieved April 8, 2018.
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