Sampson Trails

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The Sampson Trails were a statewide system of lettered highways in the U.S. state of Idaho in the 1920s. They were marked by Charles B. Sampson of Boise at no expense to the state.^[1] By the mid-1930s, the state had adopted a more standard system of numbered state highways.^[2]^[3]

The following trails were marked:^[4]

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
E, not on the 1926 map
F, Boise to Blackfoot via Stanley; became SH-21, SH-17, US-93, and SH-27
G, Mountain Home to Picabo via Fairfield; became SR-22
H, Bliss to Trude via Arco; became SH-24, SH-23, SH-22, SH-29, and an unnumbered road
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;^{[citation needed]} 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
W, not on the 1926 map
X, not on the 1926 map
Y, Bonners Ferry to Canada; became US-95