Idaho Highway 1 to Idaho Highway 25

 near Emmett in 1941, FSA/OWI photo
Back to Front Page - Forward to US 26 to Idaho 50
--Route-- From Via To Miles History
ID 1 Copeland Porthill Canadian border 11 Since 1929
US 2 Montana state line Moyie Springs, Bonners Ferry, Colburn, Sandpoint, Dover, Priest River Washington state line 81 Since 1926; Originally ended at Bonners Ferry; extended west 1948
Spur US 2 Jct US 2 Sandpoint Jct US 95 <1  
ID 3 Arrow Kendrick, Deary, Bovill, Santa Jct., Saint Maries; Medimont, Rose Lake Jct I-90 118 Since 1955; Orig began Jct Alt US 95; extended south 1967
Spur ID 3 Jct ID 6 Santa Jct. Jct ID 3 <1  
ID 3 Sandpoint Hope, Clark Fork Montana state line 35 1929-1941; replaced by Alt US 10
ID 4 Wallace Gem Burke 6 Since 1929; may have run / planned to run to Montana state line
ID 5 Plummer   Saint Maries 19 Since 1929
ID 6 Washington state line Potlatch, Emida Santa Jct. 40 Since 1929; Orig ran from Washington SL to Potlatch
ID 7 (Grangeville) Preast Rd Jct. (Nezperce), Orofino, (Dent, Elk River, Bovill, Clarkia) Ahsahka (Mashburn) 17 (126) Since 1929; realigned north of Deary to Harvard in 1953; north truncated to Ashahka in 1967
ID 8 Washington state line Moscow, Troy, Deary, Bovill Elk River 54 Since 1929
ID 9 Princeton Vassar Deary 14 (29) Since 1967; replaced ID 7
ID 9 Spalding Myrtle, Peck, Orofino, Greer, Kamiah, Kooskia, Lowell, Lolo Pass Montana state line 160 1929-1967; replaced by US 12
US 10 Washington state line Post Falls, Coeur d'Alene, Kellogg, Osburn, Wallace, Mullan Montana state line 74 1926-1974; Replaced by I-90 to Coeur d'Alene 1971; Mullan 1973; fully replaced in Idaho by 1974
Alt US 10 Coeur d'Alene Sandpoint, Hope, Clark Fork Montana state line 772 1941-1968; Originally started Washington state line via Priest River; Begin point changed to Couer d'Alene 1948; Replaced by US 95 & ID 200
Bus US 10 Jct US 10 Coeur d'Alene Jct US 10 4 1963-1973; Replaced by Bus I-90
ID 11 Greer Weippe, Pierce, (Bungalow) Headquarters 43 Since 1929; May have run / planned to run to Montana state line along N Fork Clearwater River
US 12 Washington state line Lewiston, Orofino, Kamiah, Kooskia, Lowell, Lolo Pass Montana state line 174 Since 1962; Orig began Lewiston; extended to Washington state line 1967
ID 12 Craigmont Nezperce Kamiah 26 1929-1963; Replaced by ID 64; sign on front web page
ID 13 Grangeville Harpster Kooskia 26 Since 1929
Bus Spur ID 13 Jct ID 13 Kooskia Jct US 12 1  
ID 14 Grangeville Golden Elk City 50 Since 1929
I-15 Utah state line Pocatello, Blackfoot, Idaho Falls Montana state line 196 Since 1960
Bus I-15 Jct I-15 Downey, Virginia Jct I-15 ? Not in IDT Mileposting
Bus I-15 Jct I-15 McCammon Jct I-15 5  
Bus I-15 Jct I-15 Inkom Jct I-15 1  
Bus I-15 Jct I-15 Pocatello Jct I-15 6 Since 1975
Bus I-15 Jct I-15 Blackfoot Jct I-15 4 Since 1975
Bus I-15 Jct I-15 Idaho Falls Jct I-15 7 Since 1978
I-15W Jct I-80N American Falls, Pocatello Jct I-15 63 1960-19xx; Replaced by I-86
ID 15 Boise Banks, Cascade, McCall New Meadows 110 1929-19xx; Replaced by ID 55
ID 16 Star (Emmett) Emmett (Horseshoe Bend) 14 (35) Since 1929; partially replaced by ID 52; north end realigned to New Plymouth 1938; trunacted to Emmett in 1955
ID 17 Banks Garden Valley, Grimes Pass, Lowman Stanley 66 1929-19xx; partially replaced by ID 21 in 1938; then by Banks- Lowman Rd
ID 18 Oregon state line   Roswell 6 1961-19xx
ID 18 Jct US 30 Apple Valley, Parma, Notus, Caldwell, Nampa, Kuna, Owyhee Sunnyside 78 1929-1955; east end trunacted to Caldwell 193x; west end replaced to Parma 1939;
ID 19 Oregon state line Homedale, Wilder Caldwell 35 Since 1929
US 20 Oregon state line Parma, Notus, Caldwell, Boise, Mountain Home, Fairfield, Carey, Arco, Midway. (Blackfoot,) Idaho Falls, Ucon, Rexburg, Sugar City, St. Anthony, Ashton Montana state line 401 (420) Since 1940; re-aligned from Midway to Idaho Falls 1952
Alt US 20 Wyoming state line Victor, Driggs, Tetonia, Newdale Sugar City 55 1944-1954; Replaced ID 33; & replaced by ID 33
Bus US 20 Jct US 20 Idaho Falls Jct US 20 4 Since 1973
Spur US 20 Jct US 20 Boise   1  
Temp US 20 Mountain Home Hammett, Bliss, Shoshone Carey 111 1942-1976; replaced by US 93 & US 26
ID 20 Oregon state line Marsing. Huston Jct US 30 57 1929-19xx; replaced by US 95 west of Marsting 1939
ID 21 Boise Arrow Rock Junction, Idaho City, Lowman Stanley 131 Since 1929; Originally ended at Arrow Rock Junction; extended to Lowman 1935
ID 22 (Mountain Home) Jct ID 33 (Hill City, Fiarfield, Hailey, Bellevue, Picabo, Carey, Martin, Arco, Hell's Half Arce, Idaho Falls, Ririe, Swan Valley, Irwin) Dubois (Wyoming state line) 44 (285) Since 1929; no longer on any of original route; Segment from Arco via Hell's Half Acre to Idaho Falls declared impassable 1938; realigned east of Arco in 1938 to replace old ID 29; ID 22 extended east to Trude via Spencer in 1940 & east truncated in 1942; West end truncated to Jct US 20/26 in 1955
ID 23 Carey Picabo, Gannett Bellevue 22 1955-1972; replaced part of ID 22
ID 23 Shoshone Richfield Picabo 33 1929-1942; replaced by Alt US 93
ID 24 Burley Rupert, Minidoka, Kimama, Dietrich Shoshone (Bliss) 68 (98) Since 1929; partially replaced by US 26 in 19xx
ID 25 Jct I-84 (Gooding) (Wendell,) Jerome, Eden, Hazelton, Paul Declo 58 (82) Since 1929; partially replaced by ID 46

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