U.S. Highway 26 to Idaho Highway 50

 Swift & Co, Caldwell, 1941 FSA / OWI photo
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--Route-- From Via To Miles History
US 26 Washington state line Parma, Notus, Caldwell, Boise, Mountain Home, Hammett, Bliss, Shoshone, Carey, Arco, Atomic City, Blackfoot, Idaho Falls, Swan Valley, Irwin Wyoming state line 406 Since 1952; replaced ID 29, part of US 20 from US 20 via Blackfoot
Bus US 26 Jct US 26 Ririe Jct US 26 3  
ID 26 Godwin   Twin Falls 8 1929-1955; replaced by ID 74
ID 27 Oakley Heyburn Paul 27 Since 1950
ID 27 Blackfoot Arco, Mackay Challis 139 1929-1942; replaced by US 20 between Blackfoot and Arco in 1941; replaced by Alt US 93 from Arco to Challis in 1942
ID 28 (Roberts) Jct I-15 Mud Lake, Leadore, Lemhi Salmon 121 (137) Since 1929; orig route between Mud Lake and Roberts partially obliterated
ID 29 Leadore   Montana state line 14 Since 1956
ID 29 Idaho Falls Ririe, Swan Falls, Irwin Wyoming state line 73 1938-1952; replaced by US 26
ID 29 Arco Howe, Winsper Dubois 82 1929-1938; replaced by ID 22
US 30 Oregon state line Fruitland, Caldwell, Mountain Home, Bliss, Twin Falls, Burley, Heyburn, Pocatello, Inkom, McCammon, Lava Hot Springs, Soda Springs, Montpelier Wyoming state line 455 Since 1926; Originally ended at Burley; extended east 1972
Bus US 30 Jct US 30 Pocatello Jct US 30 3 Since 1972; Was Bus US 30N
Bus US 30 Jct US 30 Lava Hot Springs Jct US 30 1  
US 30N I Burley American Falls, Pocatello, Inkom, McCammon, Lava Hot Springs, Soda Springs, Montpelier Wyoming state line 183 1926-1973; Replaced by US 30
Bus US 30N Jct US 30N Pocatello Jct US 30N 3 1961-1973; Replaced by Bus US 30
US 30N II Oregon state line Weiser, Crystal, Payette Fruitland 24 Existed twice in same location - 1926-1927: Replaced by US 630 & US 95; 1931- 1980: Replaced by US 95 Spur US 95
US 30S Burley Idahome, Malta, Strevell Utah state line 59 1926- 1973; Moved to Interstate I-80N 1972; Replaced by ID 81
ID 31 Swan Valley   Victor 21 Since 1934
ID 31 Jct US 191 Lake Montana state line 9 1929-1934; Modern route of ID 87
ID 32 Tetonia Drummond Ashton 28 Since 1929
ID 33 Jct US 20/26 Howe, Mud Lake, Rexburg, Sugar City, Newdale, Tetonia, Driggs, Victor Wyoming state line 155 Since 1929; orig began Sugar City; replaced by Alt US 20 from 1944-1954; re-established 1954; extended west 1978, replacing ID 88
Spur ID 33       1 From IDT milepost records
ID 34 (Utah state line) Preston Grace, Soda Springs, Henry, Wayan (Gray, Twin Pines, Ozone) Wyoming state line (Idaho Falls) 106 Since 1929; partially replaced in 1935 by Gray Lake Rd, Long Valley Rd, Bone Rd and Sunnyside Rd?
ID 35 Utah state line Weston, Dayton, Clifton, Oxford Jct US 91 27 1955-196x
ID 35 Utah state line Fish Haven, Paris, Ovid, Montpelier Geneva 40 1929-1939; Replaced by US 89
ID 36 Jct I-15 Weston, Preston, Mink Creek Jct US 89 75 Since 1964
ID 36 Utah state line Malad City Downey 30 1929-1938; Replaced by US 191
ID 37 (Malad City) Holbrook Roy, Rockland American Falls 11 Since 1929; Partially replaced by ID 38
ID 38 Malad   Holbrook 23 Since 1988
ID 38 Roy Arbon, Pauline, Crystal Pocatello 59 1929-196x
ID 39 American Falls Aberdeen, Springfield, Rockford, Riverside Blackfoot 53 Since 1929
ID 40 Jct I-15   Downey 3 Since 1974
ID 40 Wyoming state line Geneva Wyoming state line 10 1929-1939; replaced by US 89
ID 41 Post Falls Rathdrum, Spirit Lake, Blanchard Washington state line 39 Since 1934
ID 42 Arrow Juliaetta Kendrick 12 1962-1967; replaced by ID 3
ID 42 Kendrick Deary Harvard 32 1934-1953; Replaced by ID 7 in 1953; Modern ID 3 and ID 9; extended south to Spalding 1944
ID 43 Jct US 26   Ucon 4 Since 1985; also part of Bus US 20
ID 43 Bovill Clarkia, Fernwood Mashburn 33 1953-1967; extened south to Elk River in 1961; replaced by ID 3 and ID 8
ID 43 Ashahka Cavendish, Cresent Linden 43 1934-1953; replaced by ID 7, then Cavendish Rd, 3 Bear Rd, Cedar Ridge Rd; end reset to Kendrick 1938
ID 44 Jct US 30 Middleton, Star, Eagle Jct US 20/26 (Boise) 22 Since 1934
ID 45 Caldwell   Nampa 18 Since 1934
ID 46 Wendell Gooding Fairfield 43 Since 1935; Orig began Gooding; extended south 1955
Spur ID 46       1 From IDT milepost records
ID 47 Ashton Marysville, Warm River Jct Fish Creek Rd (Jct US 20) 12 Since 1935; Orig rte Jct US 191 to Wyoming state line; partially replaced by Cave Falls Hwy
ID 48 Roberts Menan, Lewisville, Rigby Ririe 24 Since 1935
ID 49 Idaho Falls   Lewisville 14 1955-196x
ID 49 Oregon state line   Jct ID 18 2 1937-1940; replaced by US 20
ID 50 Hansen   Jct ID 25 8 (18) Since 1938; Orig began Twin Falls

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Page first posted Monday, October 30, 2006
Page last updated Tuesday, October 31, 2006
(c) RV Droz