List of state highways in Idaho

The Idaho Transportation Department (ITD) is responsible for the establishment and classification of a state highway network, including 5,000 miles (8,000 km) of roads that are classified as Interstate Highways, U.S. Highways, and state highways within the state of Idaho in the United States.[1] The current state highway marker consists of a white background, black numbering, and a solid black geographic outline of the state of Idaho.

State Highway 3 marker

State Highway 75 marker

State Highway 200 marker

Highway markers for State Highways 3, 75 and 200
Highway names
InterstatesInterstate X (I-X)
US HighwaysU.S. Route X (US-X)
System links
  • Idaho State Highway System

History

Marker design prior to 2020
Scenic state highway marker formerly used on Idaho State Highway 21

During the 1920s, in lieu of numbering its highways, Idaho had a system of lettered Sampson Trails.[2] They were marked by businessman Charles B. Sampson of Boise at no expense to the state, using orange-colored shields.[3] By 1929, the trails system had included 6,500 miles (10,500 km) of marked highways that covered most of the state.[4] By the mid-1930s, the state had adopted a more standard system of numbered state highways.[5][6]

In 1978, the ITD began using brown state highway markers to denote scenic Idaho highways,[7] in addition to the main highway markers that featured a black background and white lettering and the name "IDAHO" in black lettering inside a white geographic outline of the state. The brown markers were discontinued around 2012, and in April 2020, ITD changed the coloring of the main state highway marker to its current color scheme, also adding a wide version of the marker for three-digit highways and removing the word "IDAHO" from all markers in the process.[8]

Sampson Trails

Rand McNally Atlas from 1926 showing the Sampson Trails as well as US Highways

The following Sampson Trails were marked:[2]

State highways

Number Length (mi)[9] Length (km) Southern or western terminus Northern or eastern terminus Formed[10] Removed Notes
SH-1 12.27919.761 US-95 near CopelandHwy 21 at Porthill 01932-01-011932current
SH-3 US-95 / US-195 (now US 2) in PonderayMT 3 near Clark Fork 01929-01-01192901940-01-011940 Replaced by US-10 Alternate
SH-3 117.680189.388 US-12 near SpaldingI-90 near Rose Lake 01953-01-011953current
SH-4 7.38011.877 I-90 in WallaceNational Forest Road No. 7623 at Burke 01929-01-011929current
SH-5 19.14030.803 US-95 in PlummerSH-3 in Saint Maries 01929-01-011929current
SH-6 40.64565.412 SR 272 near PotlatchSH-3 near Santa 01929-01-011929current
SH-7 16.56326.656 Russell Ridge Road near OrofinoOld Highway 7 in Ahsahka 01929-01-011929current Formerly continued north to Harvard and south to Grangeville
SH-8 53.58986.243 SR 270 in Moscow1st Street in Elk River 01929-01-011929current
SH-9 US-95 in SpaldingS-412 at the Montana state line 01929-01-01192901962-01-011962 Replaced by US-12
SH-9 13.52221.762 SH-8 near DearySH-6 near Harvard 01965-01-011965current
SH-10 SH-7 in GreencreekSH-9 (now US 12) in Kamiah 01952-01-01195201953-01-011953 Duplicated US 10; renumbered SH-62
SH-11 42.48168.367 US-12 in GreerForest Service Road No. 247 near Headquarters 01929-01-011929current
SH-12 US-95 Business in CraigmontSH-62 in Kamiah 01929-01-01192901962-01-011962 Renumbered SH-64 because US-12 extended into Idaho
SH-13 26.39042.471 US-95 in GrangevilleUS-12 near Kooskia 01929-01-011929current
SH-14 49.51579.687 SH-13 near HarpsterAirport Road in Elk City 01929-01-011929current
SH-15 US-95 near MarsingUS-30 in Boise 01929-01-01192901967-01-011967 Renumbered as SH-55 (which continued west from Boise) because of I-15
SH-16 16.00525.758 US-26 near StarSH-52 in Emmett 01929-01-011929current
SH-17 SH-15 (now SH-55) in BanksCrouch 01929-01-01192901960-01-011960 Now Banks-Lowman road; formerly continued east to Lowman; until 1938 continued east to Stanley;
SH-18 US-30 in FruitlandUS-30 in Caldwell 01929-01-01192901940-01-011940 Replaced by US-95 and US-20 (US-26 was added to this section of US-20 as a concurrency in 1952)
SH-18 Oregon state lineUS-95 in Parma 01953-01-01195301975-01-011975 Now Wanstad Road and Roswell Road
SH-19 19.91532.050 OR 201 near HomedaleI-84 Business in Caldwell 01929-01-011929current
SH-20 US-95 near MarsingUS-30 near Nampa 01929-01-01192901953-01-011953 Renumbered SH-72 because US-20 extended into Idaho; now part of SH-55; until 1939, continued southwest to Oregon state line
SH-21 130.869210.613 I-84 in BoiseSH-75 in Stanley 01929-01-011929current
SH-22 43.93670.708 SH-33 near HoweI-15 in Dubois 01929-01-011929current Originally continued west to Mountain Home
SH-23 US-93 in ShoshoneSH-22 in Carey 01929-01-01192901941-01-011941 Replaced by US-93 Alternate (now US-93) and US-20 Temp (now US-26)
SH-23 US-93 (now SH-75) in BellevueSH-68 (now US-20) in Picabo 01953-01-01195301971-01-011971 Now Gannett Road; originally continued east to Carey
SH-24 67.533108.684 I-84 / US-30 in HeyburnUS-93 in Shoshone 01929-01-011929current Originally continued west to Bliss
SH-25 58.04893.419 I-84 near JeromeI-84 / SH-77 near Declo 01929-01-011929current
SH-26 7.83512.609 US-93 near KnullUS-30 in Twin Falls 01929-01-01192901953-01-011953 Renumbered SH-74 because US-26 extended into Idaho
SH-27 7.83512.609 US-93 in ChallisUS-91 in Blackfoot 01929-01-01192901941-01-011941 Replaced by US-93 Alternate (now US-93) and US-20 (now US-26)
SH-27 26.56142.746 Main Street in OakleySH-25 in Paul 01950-01-011950current
SH-28 135.645218.299 SH-33 near Mud LakeUS-93 in Salmon 01929-01-011929current
SH-29 SH-27 (now US-26) in ArcoUS-91 in Dubois 01929-01-01192901938-01-011938 Replaced by SH-22
SH-29 US-91 in Idaho FallsWyoming border 01938-01-01193801952-01-011952 Former portion of SH-22; replaced by US-26
SH-29 13.61421.910 SH-28 in LeadoreMontana Secondary Highway 324 at Bannock Pass 01953-01-011953current
SH-31 US-191 (now US 20) in Island ParkMontana state line at Raynolds Pass 01929-01-01192901934-01-011934 Later restored as SH-96, later SH-287, now later SH-87
SH-31 21.02533.836 US-26 in Swan ValleySH-33 in Victor 01934-01-011934current
SH-32 28.38645.683 SH-33 near TetoniaSH-47 near Ashton 01929-01-011929current
SH-33 155.084249.584 US-20 / US-26 near ArcoWYO 22 near Victor 01929-01-011929current
SH-34 105.980170.558 US-91 / SH-36 in PrestonWYO 239 near Freedom 01929-01-011929current Formerly continued south to the Utah border
SH-35 SH-40 (now US-89) in GenevaUtah state line 01929-01-01192901939-01-011939 Replaced by US-89
SH-35 US-91 in Red Rock JunctionUtah state line 01953-01-01195301962-01-011962 Now Old Oxford Highway and Oxford Highway
SH-36 US-91 in DowneyUtah state line 01929-01-01192901938-01-011938 replaced by US-191 (now I-15)
SH-36 73.313117.986 I-15 near Malad CityUS-89 in Ovid 01962-01-011962current
SH-37 31.23150.261 OnediaPower county line near HolbrookI-86 near American Falls 01929-01-011929current Formerly continued to Malad City
SH-38 Power/Bannock County Line south of PocatelloSH-37 east of Holbrook 01929-01-01192901960-01-011960 Now Arbon Valley Road, Arbon Valley Highway, and Bannock Highway; continued north to Pocatello until 1955
SH-38 23.43837.720 North Holbrook Road near HolbrookI-15 in Malad City 01985-01-011985current Formerly part of SH-37
SH-39 52.92485.173 I-86 in American FallsUS-26 in Blackfoot 01929-01-011929current
SH-40 Wyoming state lineSH-35 (now US-89) in Geneva 01929-01-01192901939-01-011939 Replaced by US-89
SH-40 2.7374.405 I-15 near DowneyUS-91 in Downey 01972-01-011972current
SH-41 39.05862.858 I-90 in Post FallsUS-2 in Oldtown 01931-01-011931current
SH-42 SH-7 in KendrickUS-12 near Spalding 01934-01-01193401965-01-011965 Replaced by SH-3; originally continued north to Harvard
SH-43 SH-7 in AhsahkaSH-42 in Kendrick 01934-01-01193401946-01-011946 Restored as part of rerouted SH-7 in 1953; now Old Highway 7
SH-43 US-95 Alternate near SantaElk River 01953-01-01195301965-01-011965 Replaced by SH-3 and SH-8
SH-43 3.8686.225 US-26 at Beachs CornerUS-20 in Ucon 01978-01-011978current
SH-44 23.08937.158 I-84 near CaldwellUS-20 / US-26 in Garden City 01934-01-011934current
SH-45 17.98528.944 SH-78 at Walters FerryI-84 Business in Nampa 01934-01-011934current
SH-46 43.05269.285 I-84 near WendellUS-20 near Fairfield 01935-01-011935current
SH-47 12.42019.988 US-20 near Warm RiverWyoming state line 01935-01-01193501957-01-011957
SH-47 12.42019.988 US-20 in AshtonCaribou-Targhee National Forest near Warm River 01958-01-011958current
SH-48 24.40939.282 I-15 near RobertsUS-26 Business in Ririe 01935-01-011935current
SH-49 Washington state lineUS-95 near Parma 01937-01-01193701940-01-011940 Replaced by US-20 (US-26 was added to this section of US-20 as a concurrency in 1952)
SH-49 SH-48 near Menan97th north near Idaho Falls 01953-01-01195301962-01-011962 Until 1957, continued south to US 20/US 191 (now Business US 20); now 5th East/3400 East, 100 North, and 3500 East
SH-50 8.09213.023 US-30 near KimberlySH-25 near Eden 01938-01-011938current
SH-51 93.598150.631 Nevada State Route 225 near Owyhee, NevadaI-84 Business in Mountain Home 01938-01-011938current
SH-52 54.12687.107 OR 52 in PayetteSH-55 in Horseshoe Bend 01938-01-011938current
SH-52A 54.12687.107 Payette RiverSH-52 near Emmett 01953-01-01195301973-01-011973 now Black Canyon Highway
SH-53 14.25522.941 SR 290 near State LineUS-95 near Hayden 01938-01-011938current
SH-54 15.44024.848 SH-41 in Spirit LakeMain Avenue in Bayview 01953-01-011953current
SH-55 US-2 in ColburnUS-10 Alternate near Kootenai 01953-01-01195301955-01-011955 now Colburn-Culver Road
SH-55 156.047251.133 US-95 near MarsingUS-95 in New Meadows 01967-01-011967current
SH-56 US-95 in SagleGarfield 01953-01-01195301955-01-011955 now Sagle Road, Glengary Road, and Garfield Cutoff Road
SH-57 37.23059.916 US-2 in Priest RiverReeder Creek Road in Nordman 01953-01-011953current
SH-58 2.9434.736 SR 278 near Rockford, WashingtonUS-95 near Worley 01953-01-011953current
SH-60 5.5108.867 SR 274 near Tekoa, WashingtonUS-95 near Tensed 01959-01-011959current
SH-61 0.7401.191 WYO 89 near GenevaUS-89 in Geneva 01953-01-011953current
SH-62 15.41024.800 US-95 Business in CraigmontSH-64 / SH-162 in Nezperce 01953-01-011953current
SH-64 15.40924.798 SH-62 / SH-162 in NezperceSH-162 in Kamiah 01962-01-011962current Originally continued west to Craigmont
SH-66 0.9921.596 Palouse Cove Road near Palouse, WashingtonUS-95 near Viola 01953-01-011953current
SH-67 8.94814.400 Mountain Home Air Force BaseSH-51 in Mountain Home 01953-01-011953current
SH-68 US-30 in Mountain HomeUS-20 Temp / US-26 in Carey 01953-01-01195301978-01-011978 Replaced by rerouted US-20
SH-69 8.01212.894 Orchard Avenue in KunaI-84 / US-30 / SH-55 in Meridian 01953-01-011953current
SH-70 Eaton Road near EatonUS-95 Business in Weiser 01953-01-01195301977-01-011977 Now County Road 70
SH-71 28.73046.236 US-95 in CambridgeOR 86 near Brownlee Dam 01956-01-011956current
SH-72 US-95 near MarsingUS-30 near Nampa 01953-01-01195301967-01-011967 Renumbered as part of SH-55
SH-72 1.9893.201 US-30 near New PlymouthSH-52 at Hamilton Corner 01972-01-011972current Former alignment of US-30
SH-73 US-30 in BuhlCastleford 01953-01-01195301953-01-011953 Now 1400 East, 3700 North, 1200 East, and 3600 North
SH-73 US-30 in New PlymouthI-84 01965-01-01196501972-01-011972 Replaced by rerouted US-30
SH-74 7.83512.609 US-93 near KnullUS-30 in Twin Falls 01953-01-011953current
SH-75 US-93 in KetchumSun Valley 01953-01-01195301977-01-011977 For a time continued northeast to Chilly; redesignated as a spur of the current route
SH-75 170.666274.660 US-26 / US-93 in ShoshoneUS-93 near Challis 01977-01-011977current Former alignment of US-93
SH-76 1420 North north of RichfieldUS-26 in Richfield 01953-01-01195301954-01-011954 Now 3rd Street and Center Road
SH-77 30.67649.368 SH-81 in MaltaI-84 / SH-25 near Declo 01953-01-011953current
SH-78 99.720160.484 SH-55 in MarsingI-84 Business in Hammett 01972-01-011972current
SH-79 2.5644.126 I-84 in JeromeSH-25 in Jerome 01953-01-011953current
SH-80 SH-48 in MenanUS-20 in Lorenzo 01953-01-01195301962-01-011962 Now Menan-Lorenzo Highway
SH-81 33.97854.682 SH-77 in MaltaUS-30 in Burley 01970-01-011970current
SH-84 US-20 in Macks InnBig Springs 01953-01-01195301977-01-011977 Now Big Springs Loop Road
SH-86 West Side Highway (formerly SH-35) in DaytonUS-91 in Preston 01953-01-01195301964-01-011964 Removed from the state highway system; restored in 1985 as part of SH-36
SH-87 9.13314.698 US-20 in Island ParkMT 87 at Raynolds Pass 01967-01-011967current
SH-88 US-20 / US-26 near ArcoUS-20 in Rexburg 01953-01-01195301977-01-011977 Replaced by SH-33
SH-96 9.13314.698 US-20 in Island ParkMT 287 at Raynolds Pass 01959-01-01195901960-01-011960 renumbered SH-287 to match Montana; later renumbered SH-87 on both sides of the border
SH-97 35.74557.526 SH-3 near HarrisonI-90 near Coeur d'Alene 01977-01-011977current
SH-99 11.68618.807 SH-3 in KendrickSH-8 in Troy 01961-01-011961current
SH-128 2.1983.537 SR 128 near LewistonUS-12 in Lewiston 01989-01-011989current
SH-162 31.07750.014 SH-62 / SH-64 in NezperceUS-12 in Kamiah 01993-01-011993current Former portion of SH-62
SH-167 16.31926.263 SH-78 in Grand ViewSH-67 near Mountain Home Air Force Base 02010-01-012010current Former portion of SH-67
SH-200 33.16953.380 US-2 / US-95 in PonderayMT 200 near Clark Fork 01967-01-011967current Formerly U.S. Route 10 Alternate
SH-287 9.13314.698 US-20 in Island ParkMT 287 at Raynolds Pass 01960-01-01196001967-01-011967 renumbered SH-87 when Montana renumbered Highway 287 to Highway 87

See also

References

  1. "Frequently Asked Questions". Idaho Transportation Department. Retrieved February 15, 2017.
  2. Rand McNally Auto Road Atlas, 1926, accessed via the Broer Map Library
  3. Senate Concurrent Resolution No. 8, "a concurrent resolution...to permit Charles B. Sampson to extend the marking system of the Sampson Trail..." passed February 16, 1933
  4. Lawson, H. A. (March 25, 1929). "Blazing Western Trails is Unique Hobby of Idahoan". Daily Herald. p. 3. Retrieved April 21, 2019 via Newspapers.com.
  5. H.M. Gousha Company, Western States road map, published by Standard Oil Company of California, 1935
  6. Rand McNally and Company, Road map: Idaho, Mont., Wyo., published by Texaco, 1937
  7. "Colored US highway shields". US ends .com. April 5, 2020. Retrieved April 26, 2020.
  8. "Traffic Manual: Idaho Supplementary Guidance to the MUTCD" (PDF). Idaho Transportation Department. April 2020. pp. 37–38, 60. Retrieved April 26, 2020.
  9. "Milepoint Logs". Idaho Transportation Department. Archived from the original on February 16, 2017. Retrieved February 15, 2017.
  10. Downing, T.A. (April 15, 1937). "Designated Federal and State Highways Minute Book 09". Idaho Bureau of Highways. Retrieved October 3, 2018 via Idaho State Archives.



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