List of state highways in Idaho
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The Idaho Transportation Department (ITD) is responsible for the establishment and classification of a state highway network, including Script error: No such module "convert". 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.
History
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 Script error: No such module "convert". 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
The following Sampson Trails were marked:[2]
- 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;Script error: No such module "Unsubst". 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
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See also
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References
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- ↑ Script error: No such module "citation/CS1".
- ↑ a b 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
- ↑ Script error: No such module "citation/CS1".
- ↑ 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
- ↑ Script error: No such module "citation/CS1".
- ↑ Script error: No such module "citation/CS1".
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External links
- Idaho Transportation Department
- Road Signs of Idaho (archived April 27, 2004)
- Pend Oreille Scenic Byway
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