Talk:List of state highways in Montana

State route naming conventions poll/Part2
This state's highway naming convention is up for debate above. Feel free to participate. --Rschen7754 (talk - contribs)  05:46, 4 September 2006 (UTC)

Other numbers
Maps such as show an additional layer of numbering (N- and P- numbers) that often agree with the state highway numbers. They may be related to the functional classification.
 * 1: US 2; ID to ND
 * 2: BL 94, US 12; I-94 west of Miles City to ND
 * 3: US 89; I-15 to US 2
 * 4: US 310, BL 90; WY to I-90 east of Laurel
 * 5: US 93; I-90 to Canada
 * 6: MT 200; ID to US 93
 * 7: US 93, US 12; ID to I-90
 * 8: US 12, US 287; BL 90 Garrison to MT 2
 * 9: US 287; I-15 to US 89
 * 10: US 87; US 89 to US 2
 * 11: US 89, BL 90; Yellowstone to I-90 east of Livingston
 * 12: US 20; ID to Yellowstone
 * 13: MT 87, US 287, MT 2; ID to I-90 east of Three Forks
 * 14: US 12; US 287 to I-94
 * 15: I-15
 * 16: US 87; I-90 to US 12
 * 17: MT 117; MT 24 to US 2
 * 18: MT 59; BL 94 to MT 200
 * 19: MT 1; I-90 to I-90
 * 20: MT 16, MT 200; BL 94 to ND
 * 21: BL 15 Conrad
 * 22: MT 5, MT 16; MT 13 to US 2
 * 23: MT 59, US 212; BL 94 to WY
 * 24: MT 200; I-90 to US 89
 * 25: MT 13, MT 25; MT 200 to US 2
 * 26: MT 23; MT 200 to ND
 * 27: MT 7; Ekalaka to BL 94
 * 28: US 212; Yellowstone to US 310
 * 29: MT 287, MT 41, MT 2, BL 15/90; US 287 to I-115
 * 30: MT 5; MT 16 to ND
 * 31: MT 24; MT 42 to Canada
 * 32: MT 13; MT 25 to Canada
 * 33: MT 37; US 2 to US 93
 * 34: MT 16; MT 5 to Canada
 * 35: MT 135; I-90 to MT 200
 * 36: MT 28; MT 200 to US 93
 * 37: US 212; I-90 to MT 59
 * 38: MT 40; US 93 to US 2
 * 39: MT 39; US 212 to I-94
 * 40: ?
 * 41: MT 141; US 12 to MT 200
 * 42: MT 24, MT 42; MT 200 to US 2
 * 43: US 191; US 87 to MT 19
 * 44: MT 44; US 89 to I-15
 * 45: US 191; BL 90 to US 12
 * 46: MT 43; US 93 to I-15
 * 47: MT 48; MT 1 to I-90
 * 48: BL 90, MT 47; I-90 east of Hardin to I-94
 * 49: MT 41; BL 15 to MT 287
 * 50: US 191; US 20 to I-90
 * 51: MT 200; MT 200S to MT 20
 * 52: MT 35; US 93 to US 2
 * 53: MT 3; I-90 to US 12
 * 54: MT 59; WY to US 212
 * 55: MT 55; MT 41 to I-90
 * 56: MT 56; MT 200 to US 2
 * 57: MT 200, MT 200S, BL 94; US 89 to I-94 east of Glendive
 * 58: US 89; US 2 to Canada
 * 59: US 89; I-90 to US 12
 * 60: US 89; US 12 to I-315
 * 61: US 87, MT 19, US 191; US 12 to US 2
 * 62: MT 16; US 2 to MT 200
 * 63: US 191; US 12 to US 87
 * 64: ?
 * 65: Going to the Sun Highway; US 2 to Glacier
 * 66: MT 66; US 191 to US 2
 * 67: BL 15 Shelby
 * 68: MT 68; I-15 to I-15
 * 69: MT 69; MT 55 to I-15
 * 70: ?
 * 71: ?
 * 72: MT 72; WY to US 310
 * 73: ?
 * 74: ?
 * 75: US 87 Bus. Lewistown
 * 76: ?
 * 77: ?
 * 78: MT 78; US 212 to I-90
 * 79: ?
 * 80: MT 80; US 87 to US 87
 * 81: MT 81; MT 80 to US 191
 * 82: MT 82; US 93 to MT 35
 * 83: MT 83; MT 200 to MT 35
 * 84: MT 84; US 287 to US 191
 * 85: MT 85; US 191 to I-90
 * 86: MT 86; I-90 to US 89
 * 87: US 287; MT 87 to US 191
 * 88: BL 90 Garrison
 * 89: BL 15 Dillon
 * 90: I-90
 * 91: BL 90 Big Timber
 * 92: US 93; I-90 to US 12
 * 93: US 12; ID to US 93
 * 94: I-94
 * 95: Cartersville Road north of Forsyth
 * 96: BL 90 Drummond
 * 97: BL 94 Wibaux
 * 98: BL 94 Glendive west of MT 200S
 * 99: US 191; US 2 to Canada
 * 100: ?
 * 101: ?
 * 102: Great Falls Northeast Bypass

--NE2 00:52, 28 March 2008 (UTC)

The functional classification designations refer to the various funding pots available for maintenance funding. "I" is used exclusively for federal Interstates. "N" is used for all other National Highway System-funded routes, even those completely signed as state highways. "P" routes are generally Primary State Highway System, "S" routes are Secondary State Highway System, and "U" routes are Urban routes through city and urban limits. Older editions of the road log also listed "X" for off-system routes eligible for other funding, e.g. MT 38 is X-81024, even though it has a Primary route number, because most of its route is through National Forest land. (MT 49 is also affected this way.) Off-system routes are still listed in the state GIS database. 184.166.187.64 (talk) 10:35, 4 May 2017 (UTC)

Missing primary state route info
Just an FYI, I can't find any trace of MT-10 or MT-89 on Google Maps or other sources. Perhaps they're decommissioned routes? Someone who's native to Montana and/or knows how to read the MT route logs may be able to figure this out.71.58.106.195 (talk) 05:30, 4 March 2017 (UTC)

I have been doing extensive research on the historical Montana state highway maps dating back to 1935, and based on this research, it appears MT 10 and MT 89 have never been assigned. Very rarely has Montana used state route numbers when an active federal route with the same number exists. The only historical exceptions are MT 287 (established before the US 287 designation replacing most of MT 287), 1935-era MT 191 (replaced by US 287) from US 191 to near Three Forks, MT 87 (nowhere near the US route), and MT 2 (replaced a section of old US 10 from Butte to Three Forks, but nowhere near the US route). 184.166.187.64 (talk) 10:06, 4 May 2017 (UTC)