List of state highways in Idaho
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
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][6]
- A, Boise to Wyoming via Twin Falls and Pocatello; became US-30 and US-30N
- B, Boise to Canada via Lewiston and Coeur d'Alene; became US-30, US-30N, US-95, and SH-1
- C, Pocatello to Montana via Idaho Falls; became US-91 and US-191
- D, Boise to New Meadows via Banks; became SH-15 (today's SH-55)
- E, not on the 1926 map
- F, Boise to Blackfoot via Stanley; became SH-21, SH-17, US-93 (today's SH-75), and SH-27
- G, Mountain Home to Picabo via Fairfield; became SH-22 (today's US-20)
- H, Bliss to Trude via Arco; became SH-24, SH-23, SH-22, SH-29, and an unnumbered road (today's US-20 and US-26)
- I, Pioneer to Idaho Falls; became an unnumbered road
- J, Nevada to Shoshone via Twin Falls; became US-93
- K, Utah to McCammon via Preston; became US-91
- L, not on the 1926 map
- M, Washington to Montana via Coeur d'Alene; became US-10
- N, Bonners Ferry to Montana; became US-2
- O, Oregon to Caldwell; became SH-49 and SH-18
- P, Utah to Downey; became SH-36
- Q, Declo to Fairfield; became SH-25 and SH-46
- R, not on the 1926 map
- S, Oregon to Nampa; became unnumbered road and SH-45
- T, Star to Grimes Pass; became SH-16, unnumbered road, and SH-17
- U, Utah to Montpelier; became SH-35
- V, Hailey to Stanley; became US-93 (today's SH-75)
- W, not on the 1926 map
- X, not on the 1926 map
- Y, Bonners Ferry to Canada; became US-95
State highways
Number | Length (mi)[7] | 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 | Onedia–Power 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 | 1972 | 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
- Idaho portal
- U.S. Roads portal
References
- ↑ "Frequently Asked Questions". Idaho Transportation Department. Retrieved February 15, 2017.
- 1 2 Rand McNally Auto Road Atlas, 1926, accessed via the Broer Map Library
- ↑ 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
- ↑ H.M. Gousha Company, Western States road map, published by Standard Oil Company of California, 1935
- ↑ Rand McNally and Company, Road map: Idaho, Mont., Wyo., published by Texaco, 1937
- ↑ Droz, RV (2006). "Sampson Trails". US-Highways.com. Archived from the original on June 29, 2011. Retrieved February 17, 2017.
- ↑ "Milepoint Logs". Idaho Transportation Department. Retrieved February 15, 2017.
External links
- Idaho Transportation Department
- Road Signs of Idaho
- Idaho U.S. Highways Page
- Pend Oreille Scenic Byway
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