List of state highways in Idaho

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State Highway 3 marker State Highway 75 marker State Highway 200 marker
Highway markers for State Highways 3, 75 and 200
Highway names
Interstates Interstate X (I-X)
US Highways U.S. Route X (US-X)
State Idaho State Highway X (SH-X)
System links

The Idaho Transportation Department 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.[1]

History[edit]

Instead of numbering its highways, Idaho had a system of lettered Sampson Trails in the 1920s.[2] They were marked by Charles B. Sampson of Boise at no expense to the state.[3] By the mid-1930s, the state had adopted a more standard system of numbered state highways.[4][5]

The following trails were marked:[2]

State highways[edit]

Number Length (mi)[6] Length (km) Southern or western terminus Northern or eastern terminus Formed Removed Notes
SH 1 12.279 19.761 US-95 near Copeland BC 21 at Porthill
SH 3 117.680 189.388 US-12 near Spalding I-90 near Rose Lake
SH 4 7.380 11.877 I-90 in Wallace National Forest Road No. 7623 at Burke
SH 5 19.140 30.803 US-95 in Plummer SH-3 in Saint Maries
SH 6 40.645 65.412 WA 272 near Potlatch SH-3 near Santa
SH 7 16.563 26.656 Russell Ridge Road near Orofino Old Highway 7 in Ahsahka
SH 8 53.589 86.243 WA 270 in Moscow 1st Street in Elk River
SH 9 13.522 21.762 SH-8 near Deary SH-6 near Harvard
SH 11 42.481 68.367 US-12 in Greer Forest Service Road No. 247 near Headquarters
SH 13 26.390 42.471 US-95 in Grangeville US-12 near Kooskia
SH 14 49.515 79.687 SH-8 near Harpster Airport Road in Elk City
SH 16 16.005 25.758 US-26 near Star SH-52 in Emmett
SH 19 19.915 32.050 OR 201 near Homedale I-84 Business in Caldwell
SH 21 130.869 210.613 I-84 in Boise SH-75 in Stanley
SH 22 43.936 70.708 SH-33 near Howe I-15 in Dubois
SH 24 67.533 108.684 I-84 / US-30 in Heyburn US-93 in Shoshone
SH 25 58.048 93.419 I-84 near Jerome I-84 / SH-77 near Declo
SH 27 26.561 42.746 Main Street in Oakley SH-25 in Paul
SH 28 135.645 218.299 SH-33 near Mud Lake US-93 in Salmon
SH 29 13.614 21.910 SH-28 in Leadore MT S-324 at Bannock Pass
SH 31 21.025 33.836 US-26 in Swan Valley SH-33 in Victor
SH 32 28.386 45.683 SH-33 near Tetonia SH-47 near Ashton
SH 33 155.084 249.584 US-20 / US-26 near Arco WYO 22 near Victor
SH 34 105.980 170.558 US-91 / SH-36 in Preston WYO 239 near Freedom
SH 36 73.313 117.986 I-15 near Malad City US-89 in Ovid
SH 37 31.231 50.261 OnediaPower county line near Holbrook I-86 near American Falls
SH 38 23.438 37.720 North Holbrook Road near Holbrook I-15 in Malad City
SH 39 52.924 85.173 I-86 in American Falls US-26 in Blackfoot
SH 40 2.737 4.405 I-15 near Downey US-91 in Downey
SH 41 39.058 62.858 I-90 in Post Falls US-2 in Oldtown
SH 43 3.868 6.225 US-26 at Beachs Corner US-20 in Ucon
SH 44 23.089 37.158 I-84 near Caldwell US-20 / US-26
SH 45 17.985 28.944 SH-78 at Walters Ferry I-84 Business in Nampa
SH 46 43.052 69.285 I-84 near Wendell US-20 near Fairfield
SH 47 12.420 19.988 US-20 in Ashton Caribou-Targhee National Forest near Warm River
SH 48 24.409 39.282 I-15 near Roberts US-26 Business in Ririe
SH 50 8.092 13.023 US-30 near Kimberly SH-25 near Eden
SH 51 93.598 150.631 NV 225 near Owyhee, NV I-84 Business in Mountain Home
SH 52 54.126 87.107 OR 52 in Payette SH-55 in Horseshoe Bend
SH 53 14.255 22.941 WA 290 near State Line US-9 near Hayden
SH 54 15.440 24.848 SH-41 in Spirit Lake Main Avenue in Bayview
SH 55 156.047 251.133 US-95 near Marsing US-95 in New Meadows
SH 57 37.230 59.916 US-2 in Priest River Reeder Creek Road in Nordman
SH 58 2.943 4.736 WA 278 near Rockford, WA US-95 near Worley
SH 60 5.510 8.867 WA 274 near Tekoa, WA US-95 near Tensed
SH 61 0.740 1.191 WYO 89 near Geneva US-89 in Geneva
SH 62 15.410 24.800 US-95 Business in Craigmont SH-64 / SH-162 in Nezperce
SH 64 15.409 24.798 SH-62 / SH-162 in Nezperce SH-162 in Kamiah
SH 66 0.992 1.596 Palouse Cove Road near Palouse, WA US-95 near Viola
SH 67 8.948 14.400 Mountain Home Air Force Base SH-51 in Mountain Home
SH 69 8.012 12.894 Orchard Avenue in Kuna I-84 / US-30 / SH-55 in Meridian
SH 71 28.730 46.236 US-95 in Cambridge OR 86 near Brownlee Dam
SH 72 1.989 3.201 US-30 near New Plymouth SH-52 at Hamilton Corner
SH 74 7.835 12.609 US-93 near Knull US-30 in Twin Falls
SH 75 170.666 274.660 US-26 / US-93 in Shoshone US-93 near Challis
SH 77 30.676 49.368 SH-81 in Malta I-84 / SH-25 near Declo
SH 78 99.720 160.484 SH-55 in Marsing I-84 Business in Hammett
SH 79 2.564 4.126 I-84 in Jerome SH-25 in Jerome
SH 81 33.978 54.682 SH-77 in Malta US-30 in Burley 01972-01-011972 current
SH 87 9.133 14.698 US-20 in Island Park MT 87 near Island Park
SH 97 35.745 57.526 SH-3 near Harrison I-90 near Coeur d'Alene
SH 99 11.686 18.807 SH-3 in Kendrick SH-8 in Troy
SH 128 2.198 3.537 WA 128 near Lewiston US-12 in Lewiston
SH 162 31.077 50.014 SH-62 / SH-64 in Nezperce US-12 in Kamiah
SH 167 16.319 26.263 SH-78 in Grand View SH-67 near Mountain Home AFB
SH 200 33.169 53.380 US-2 / US-95 in Ponderay MT 200 near Clark Fork

See also[edit]

References[edit]

  1. ^ "Frequently Asked Questions". Idaho Transportation Department. Retrieved February 15, 2017. 
  2. ^ a b 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. ^ H.M. Gousha Company, Western States road map, published by Standard Oil Company of California, 1935
  5. ^ Rand McNally and Company, Road map: Idaho, Mont., Wyo., published by Texaco, 1937
  6. ^ "Milepoint Logs". Idaho Transportation Department. Retrieved February 15, 2017. 

External links[edit]