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Wikipedia:WikiProject U.S. Roads/Idaho/All-time list

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Sources include:

Years before 1951 are therefore not the exact year a change was made.

In 1953 a number was assigned to every unnumbered state highway, but these don't seem to be listed in one place. At the same time, duplicate numbers were changed. A year of 1953 below means that it was probably numbered then.

from to notes
SH 1 1930s now
SH 3 1929 1940
→ US 10A
SH 3 1953 now
SH 4 1929 now
SH 5 1929 now
SH 6 1929 now
SH 7 1929 now
SH 8 1929 now
SH 9 1929 1962-07
→ US 12
SH 9 1965-08
← 7 (part)
now
SH 10 1953 1953
→ 62
number appears on 1953 map; added in 1953-07 (Kamiah-Green Creek Highway)
SH 11 1929 now
SH 12 1929 1962-07
→ 64
SH 13 1929 now
SH 14 1929 now
SH 15 1929 1967-09
→ 55 (part)
SH 16 1929 now
SH 17 1929 1960-10 started as Banks to Stanley; ended up only to Crouch
SH 18 1929 1940
→ US 20 (part)
Parma to Caldwell
SH 18 1953 1975-12 west from Parma
SH 19 1929 now
SH 20 1929 1950
→ 72
SH 21 1929 now
SH 22 1929 now
SH 23 1929 1940
→ US 93A (part)
Shoshone to Carey
SH 23 1953?
← 22 (part)
1971-12 Bellevue to Carey; east of Picabo became part of 68 earlier
SH 24 1929 now
SH 25 1929 now
SH 26 1929 1953
→ 74
SH 27 1929 1941
→ US 93A (part)
US 20 had replaced Arco to Blackfoot on 1941 Montana map; the rest of 27 became US 93A in 1942
SH 27 1950 now
SH 28 1929 now
SH 29 1929 1937
→ 22 (part)
SH 29 1938
← 22 (part)
1950
→ US 26 (part)
22 had moved on 1938 Montana map
SH 29 1953 now appears on 1955 Montana map
SH 31 1929 1934 seen on 1929 Montana map; later 287, and now 87
SH 31 1934 now
SH 32 1929 now
SH 33 1929 now became US 20A from 1944-1953
SH 34 1929 now
SH 35 1929 1939
→ US 89
southwest of Geneva
why is this labeled on the 1953 map?
SH 35 1953 1962-09 Utah to Red Rock Pass
SH 36 1929 1937
→ US 191 (part)
SH 36 1962-12 now
SH 37 1929 now
SH 38 1929 1960-09 removed 1955-10 in Bannock County
SH 38 1985-10?
← 37 (part)
now
SH 39 1929 now
SH 40 1929 1939
→ US 89 (part)
north of Geneva; did not include current 61
SH 40 1972-09 now
SH 41 1934 now
SH 42 1934 1965-08
→ 3 (part)
Spalding to Kendrick (originally continued to Harvard on what became 7 ca. 1953)
SH 43 1934 1940 Ahsahka to Kendrick
unlabeled on 1947 and 1950 maps; part of 7 in 1953
SH 43 1953 (ca.)
← 7 (part)
1965-08
→ 3 (part), 8 (part)
Mashburn to Elk River
still part of 7 on 1950 map; 43 on 1953 map
SH 43 1978-12
← US 191 (part)
now
SH 44 1934 now
SH 45 1934 now
SH 46 1935 now
SH 47 1935 1957-10
SH 47 1958-09
← US 20-191 (part)
now
SH 48 1935 now
SH 49 1937 1940
→ US 20 (part)
west of US 95
SH 49 1953 1962-09 Idaho Falls to Menan
portion at south end removed in 1957-11
SH 50 1938 now
SH 51 1938 now
SH 52 1938 now
SH 52A 1953 1973-12 northwest of Emmett; had been part of 52
SH 53 1938 now
SH 54 1953 now
SH 55 1953 1955-10 Colburn-Culver Road
SH 55 1967-09
← 15, 72
now
SH 56 1953 1955-10 Sagle-Midas Road
SH 57 1953 now
SH 58 1953 now not a state highway on 1953 map, but Worley West Road is mentioned in 1953
SH 59 1953 when? where was 59 in 1953? Probably south from Good Grief
SH 60 1953 when? where was 60 in 1953? Probably Thain Road (removed 1953-07)
SH 60 1959-09 now
SH 61 1953 now
SH 62 1953
← 10
now
SH 63 1953 when? where was 63 in 1953? Probably east from Orofino
SH 64 1953 when? where was 64 in 1953? Probably Kuna-Nampa
SH 64 1962-07
← 12
now
SH 65 1953 when? where was 65 in 1953? Probably Kuna-Regina
SH 66 1953 now
SH 67 1953 now not a state highway on 1953 map, but road is mentioned in 1952
SH 68 1953
← 22 (part)
1971?
→ US 20 (part)
mentioned in 1954 as "old State Highway 22, new number 68"
official maps show it becoming US 20 between 1970 and 1972, but minutes continue to call it 68 through 1978
SH 69 1953 now
SH 70 1953 1977-04 northwest from Weiser
SH 71 1953 when? where was 71 in 1953? Probably New Plymouth Spur
SH 71 1956-10 now
SH 72 1953
← 20
1967-09
→ 55 (part)
first mentioned in 1954
SH 72 1972-11??
← US 30 (part)
now
SH 73 1953 1953-11 Buhl-Castleford Highway
SH 73 1965 1972-11??
→ US 30 (part)
south from New Plymouth
SH 74 1953
← 26
now mentioned in 1954; originally included the Blue Lakes Spur
SH 75 1953 1977-02 Ketchum to Sun Valley; extended to Chilly in 1960-11; seems to have been cut back in 1973-1974; became a spur of 75 when US 93 was moved
SH 75 1977-02
← US 93 (part)
now 1976-12 says that AASHTO had just approved the change. Signs were scheduled to be changed on January 1, 1978
SH 76 1953 1954-12 Richfield Spur
SH 77 1953 now
SH 78 1972-11 now
SH 78 1953 when? Caldwell-south
SH 79 1953 now
SH 80 1953 1962-07 Menan to Lorenzo
SH 81 1970-12
← US 30S (part)
now where was 81 in 1953? Probably Idaho Falls-Ammon (removed 1953-01)
SH 82 never? never? where was 82 in 1953? Probably Gimlet-East
SH 83 never? never? where was 83 in 1953? Probably Gannett-West
SH 84 1953 1977-11 Started out Spencer to Macks Inn; extended to Big Springs in 1957-10 and west section removed by then
SH 85 never? never? where was 85 in 1953? Probably Shelley-North
SH 86 1953 1964-10 Dayton to Preston; now part of 36
SH 87 never? never? where was old 87?
SH 87 1967-05
← 287
now
SH 88 1958-05 1977-02
→ 33 (part)
Howe to Rexburg
SH 90 never? never? Payette to Oregon?
SH 92 never? never?
SH 94 never? never?
SH 96 1959-10 1960-09
→ 287
SH 97 1977-05?
← US 95A (part)
now
SH 99 1961-02 now
SH 128 1989-08 now
SH 162 1993??
← 62 (part)
now
SH 167 2010 (ca.)?
← 67 (part)
now
SH 200 1967 or 1968
← US 10A
now
SH 287 1960-09
← 96
1967-05
→ 87
MT 287 was temporarily rerouted after the 1959 Yellowstone earthquake