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Idaho's US Highways |
Welcome to a webpage about the US numbered highways of
the "Gem State."
This page is posted until Zack Maillard's Idaho Highways returns.
Steal this site! E-mail me for details.
Highway numbers shown like (this) are no longer used within the state of Idaho.
US 2 (US 10) US 12 US 20 US 26 US 30 (US 30N) [I] (US 30S) (US 30N) [II] US 89 US 91 US 93 US 95 (US 95E) (US 95W) (US 191) US 195 (US 287) (US 410) (US 630)
US 2
From: Montana state line east of Leonia
To: Washington state line west of Oldtown
Length in ID: 81 mi
Dates Signed in ID: 1926 - present
Bannered Routes: none known
History in ID: 1925: planned, ending at Bonner's Ferry; 1926: assigned; 1948: extended
west to Washington by co-signage with US 95 south to Sandpoint and co-signage with US 195
westward
(US 10)
From: Montana state line east of Mullan
To: Washington state line west of Post Falls
Length in ID: 73 mi (1926-1971)
Dates Signed in ID: 1926 - 1974
Bannered Routes: Alternate US 10: Idaho Border to Oregon border at Newport
(1941-1948); Idaho border to Coeur d'Alene (1948-1968); Business US 10 : Coeur
d'Alene
History in ID: 1925: planned; 1926: assigned; 1971: truncated at Coeur D'Alene, replaced
by I-90; 1973: truncated to Mullan, replaced by I-90; 1974: remainder replaced by I-90
US 12
From: Montana state line at Lolo Pass
To: Washington state line at Lewiston
Length in ID: 174 mi
Dates Signed in ID: 1962 - present
Bannered Routes: none known
History in ID: 1962: extended west from Montana, replacing ID-9 from Lolo Pass to Spalding
and co-signing with US 95 into Lewiston; 1967: extended west to Washington state,
replacing US 410
US 20
From: Montana state line at Targhee Pass
To: Oregon state line northwest of Parma
Length in ID: 401 mi
Dates Signed in ID: 1940 - present
Bannered Routes: Alternate US 20: Wyoming state line at Victor to Sugar City
(1944-1954); Business US 20: Idaho Falls; Temporary US 20 : Carey to Mountain Home
(1940-1976)
History in ID: 1925: Planned from Montana border to Oregon border along current route.
1926: Planned route assigned to US 191, 1940: extended west from Montana along US 191 to
Idaho Falls to Blackfoot, replaced ID-27 to Arco, replaced ID-22 to Carey, TEMP signs
along ID-23 to Shoshone, ID 24 to Bliss, and US 30 to Mountain Home; co-signed with US 30
to Boise, replaced ID 18 to northwest of Parma
US 26
From: Wyoming state line east of Irwin
To: Oregon state line west of Parma
Length in ID: 406 mi
Dates Signed in ID: 1951 - present
Bannered Routes: Business US 26: Ririe
History in ID: 1951: assigned along ID-29 to Idaho Falls; 1952: extended west along US 20
US 30
From: Wyoming state line south of Montpelier
To: Oregon state line west of Fruitland
Length in ID: 416 mi
Dates Signed in ID: 1926 - present
Bannered Routes: Business US 30: Pocatello
History in ID: 1925: planned as US 20; 1926: assigned; 1972: replaced US 30N [I]
(US 30N) [I]
From: Wyoming state line east of Montpelier
To: Burley
Length in ID: 184 mi (1926-1972)
Dates Signed in ID: 1926 - 1972
Bannered Routes: Business US 30N: Pocatello
History in ID: 1925: planned as US 530 from Wyoming state line to McCammon and planned as
US 20 from Idaho Falls to Cotterel; 1926: assigned; 1972: replaced by US 30
(US 30S)
From: Utah state line south of Stevenis
To: Burley
Length in ID: 59 mi (1926-1972)
Dates Signed in ID: 1926 - 1972
Bannered Routes: none known
History in ID: 1925: planned as US 191; 1926: assigned; 1972: functionally replaced by
I-80N (now I-84) / pavement replaced by ID-81
(US 30N) [II]
From: Payette
To: Oregon state line at Weiser
Length in ID: 16 mi (1926-1980)
Dates Signed in ID: 1926 - 1980
Bannered Routes: none known
History in ID: 1925: planned as US 95 from Payette to Wieser and US 320 from Weiser to
Oregon state line; 1926: assigned; 1927-1933: replaced by US 95 from Payette to Weiser and
US 630 from Weiser to Oregon
US 89
From: Wyoming state line northeast of Geneva
To: Utah state line south of Bloomington
Length in ID: 45 mi
Dates Signed in ID: 1926 - present
Bannered Routes: none known
History in ID: 1926: assigned
US 91
From: Idaho Falls
To: Utah state line south of Virginia
Length in ID: 118 mi
Dates Signed in ID: 1926 - present
Bannered Routes: Business US 91: Inkom, McCammon, Idaho Falls, Pocatello, Blackfoot
History in ID: 1925: planned from Montana state line at Monida pass ; 1926: assigned
US 93
From: Montana state line at Lost Trail Pass
To: Nevanda state line south of Hamilton
Length in ID: 341 mi
Dates Signed in ID: 1926 - present
Bannered Routes: Alternate US 93: Challis to Shoshone (1942-1977)
History in ID: 1926: assigned; 1977: realigned & replaced Alt US 93
US 95
From: International border line at Eastport
To: Nevada state line south of Filer
Length in ID: 341 mi
Dates Signed in ID: 1926 - present
Bannered Routes: Alt US 95: Coeur d'Alene to Potlatch (1935-1977); Business US 95:
Payette; Spur US 95: Weiser to Oregon state line
History in ID: 1925: planned, ending at Payette; 1926: assigned
(US 95E)
From: Coeur d'Alene
To: Potlatch
Length in ID: 89 mi (1929-1935)
Dates Signed in ID: 1929 - 1935
Bannered Routes: none known
History in ID: 1929: replaced ID ; 1935: replaced by Alt US 95 (now I-10, ID 3, & ID
6)
(US 95W)
From: Coeur d'Alene
To: Potlatch
Length in ID: 68 mi (1930)
Dates Signed in ID: 1930?
Bannered Routes: none known
History in ID: Discovered on the 1930 Bureau of Public Roads route map
(US 191)
From: Montana state line at Targhee Pass
To: Utah state line south of Woodruff
Length in ID: 219 mi (1926-1971)
Dates Signed in ID: 1926 - 1981
Bannered Routes: none known
History in ID: 1925: planned to run from Utah state line at to Cotterel, this became US
30S; 1926: assigned from Montana border at Targhee Pass to Idaho Falls along the planned
route of US 20; 1971: truncated at Idaho Falls - replaced by US 91 & I-15; 1981:
removed from co-signing with US 20 in Idaho
US 195
From: Washington state line west of Lewiston
To: Lewiston
Length in ID: 1 mi
Dates Signed in ID: 1926 - present
Bannered Routes: Spur US 195: Uniontown
History in ID: 1926: assigned from Sandpoint to Washington state line at Newport and an
ending at the Washington state line across from Lewiston; 193x: extended to Lewiston;
1969: Co-signage with US 2 dropped from Sandpoint to Washington state line
(US 287)
From: Montana state line at Raynolds Pass
To: Montana state line at Targhee Pass
Length in ID: 13 mi (1965-1966)
Dates Signed in ID: 1965 - 1966
Bannered Routes: none known
History in ID: 1965: replaced ; 1966: US 287 realigned in Montana, Idaho part renumbered
ID 287 (now ID 87)
(US 410)
From: Lewiston
To: Washington state line west of Lewiston
Length in ID: 3 mi (1926-1968)
Dates Signed in ID: 1926? - 1968
Bannered Routes: none known
History in ID: 1925: planned; 1926: assigned, but may not have entered Idaho: 1968:
replaced by US 12
(US 630)
From: Weiser
To: Oregon state line west of Weiser
Length in ID: 1 mi (1927-1933)
Dates Signed in ID: 1927? - 1933
Bannered Routes: none known
History in ID: 1927?: replaced US 30N [II]; 1933: replaced by US 30N [II]; Now Spur US 95
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This page last updated Sunday, June 01, 2003
Page originally created by Robert V. Droz on May 4, 2003.
Old-style US shield made with David Kendrick's Shields Up! Highway Shield Generator.