U.S. Route 26 in Idaho

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U.S. Highway 26 marker

U.S. Highway 26

Map
US-26 highlighted in red
Route information
Maintained by ITD
Length402.5 mi[1] (647.8 km)
Existed1951 (1951)[2]–present
Major junctions
West end US 20 / US 26 near Nyssa, OR
Major intersections
East end US 26 near Alpine, WY
Location
CountryUnited States
StateIdaho
CountiesCanyon, Ada, Elmore, Gooding, Lincoln, Blaine, Butte, Bingham, Bonneville
Highway system
  • Idaho State Highway System
SH-25 SH-27

U.S. Highway 26 (US-26) runs east–west across south central Idaho for 402.5 miles (647.8 km). US-26 enters the state from Oregon across the Snake River east of Nyssa, Oregon, concurrent with US-20 and exits into Wyoming northwest of Alpine. US-26 runs through the large population centers of Boise and Idaho Falls, as well as the smaller communities of Parma, Notus, Garden City, Shoshone, Richfield, Carey, Arco, Blackfoot, Swan Valley, and Irwin.

For a vast majority of its route, US-26 is two lanes and rural, with the exception of portions in and around major towns and cities. It does have significant four-lane segments within the Boise metropolitan area and east of Idaho Falls. Despite its extensive length, US-26 has many hundreds of miles that run concurrently with other highways. In fact, its first 138.97 miles (223.65 km) in the state consists of concurrencies with any one of five different highways, principally US-20 and Interstate 84 (I-84). It has additional lengthy concurrencies with US-93, US-20 again, and I-15.

US-26 does have one business route in the state of Idaho, which runs through the small community of Ririe northeast of Idaho Falls.

Route description[edit]

Oregon state line to Downtown Boise[edit]

After crossing the Snake River at the Oregon state line, US-26 and US-20 make a curve toward US-95. At that point, both routes travel south along US-95. The three routes then travel south and then curves southeast in Parma. Then, US-95 branches southward while the rest continues southeast. Both US-26 and US-20 pass through Notus before meeting I-84/US-30. At this point, the four routes meet I-84 Business (I-84 Bus.) and then 10th Avenue before US-20 and US-26 travel east on Franklin Road; all of the exits are in Caldwell.

As the two routes approach Boise, they intersect three state highways: State Highway 16 (SH-16), SH-55 on the Eagle–Boise city line, and SH-44 in Garden City. In Boise, as US-26 and US-20 merge eastward onto I-184, the Interstate designation ends there but the freeway ends in about 0.75 miles (1.21 km). Just after the freeway crosses the Boise River, both routes traveling eastbound serve River Street and Bogus Basin. After this, the freeway approaches a 45 mph (72 km/h) curve and then becomes an at-grade one-way pair.[3]

Downtown Boise to Blackfoot[edit]

As both routes exit downtown, they turn south and become a two-way street. Also, the two routes cross the Boise River for the second time. After that, they run along the eastern edge of Boise State University. As they approach Boise Airport, they then turn east onto I-84/US-30 again. This time, US-26 runs concurrently with I-84 for about 87 miles (140 km). Along the way, the freeway serves several state highways, I-84 business loops, and local roads in different locations. At one point east of Mountain Home, US-20 leaves the freeway and travels northeastward. As the freeway reaches Bliss, US-30, along with I-84 Bus., leaves the freeway as Thousand Springs Scenic Byway. At the next exit, US-26 leaves the freeway.

US-26 went on to serve a handful of state highways in Gooding and Shoshone. Also in Shoshone, the route begins to run concurrently with US-93. Both routes then serve Richfield. In Carey, they begin to run concurrently with US-20. For US-26, this is the second time in Idaho. The three routes serve Craters of the Moon National Monument and Preserve and Blizzard Mountain Ski Area. In Arco, US-93 branches northwestward. The rest continues eastward through Butte City and serving SH-33. Just southeast of the base of Idaho National Laboratory, US-26 branches southeast toward Blackfoot while US-20 continues east. As US-26 approaches Blackfoot, the route intersects SH-39 and then crosses over the same Snake River. Shortly after that, it turns northeast onto I-15 while the road continues as I-15 Bus.[3]

Blackfoot to Wyoming state line[edit]

At this point, US-26 begins to run concurrently with I-15 for the next 23 miles (37 km). All the interchanges within this concurrency lead to local roads. As the freeway enters Idaho Falls, US-26 leaves the freeway and turns east along I-15 Bus. Both routes then cross the Snake River (the third time for US-26) and then intersect the northern terminus of US-91. At this point, both travel north toward downtown Idaho Falls. In downtown, I-15 Bus. branches westward toward I-15/US-20. Continuing northeast, US-26 intersects several more routes: SH-43 in Beachs Corner, US-26 Bus. (twice) near Ririe, and SH-31 in Swan Valley. Continuing eastward, US-26 travels along the bank of Snake River and then enters Wyoming.[3]

History[edit]

When US-26 was initially designated in the state in 1951, it ran only as far west as Idaho Falls. The next year, it was extended into Oregon.[2]

In the Idaho Falls area, US-26 runs along local streets and county roads. In 2022, the Idaho Transportation Board approved a study into relocating parts of the highway onto US-20 following the reconstruction of the I-15/US-20 interchange at the west end of the Rigby Freeway.[4]

Major intersections[edit]

CountyLocationmi[1][5][6][7]kmExitDestinationsNotes
Canyon0.0000.000

US 20 west (East Main Street) / US 26 west – Nyssa
Continuation into Oregon
1.5782.540
US 95 north / Anderson Corner Road – Fruitland, Payette
Western end of US 95 overlap
9.64715.525
US 95 south – Wilder, Winnemucca
Eastern end of US 95 overlap
21.995–
22.129
35.398–
35.613
26

I-84 west / US 30 west / Old Highway 30 – Ontario
Western end of I-84/US 30 overlap; I-84 exit 26
Caldwell22.85836.78627

I-84 BL east to SH-19 – Caldwell, Wilder, Homedale
23.75538.2302810th Avenue – Caldwell City Center
24.840–
24.994
39.976–
40.224
29

I-84 east / US 30 east / Franklin Road – Caldwell, Boise
Eastern end of I-84/US 30 overlap; I-84 exit 29
Ada34.26755.147
SH-16 north (Central Valley Expressway) / North McDermott Road – Emmett
Southern terminus of SH-16
BoiseEagle line40.22964.742 SH-55 (North Eagle Road) – Meridian, Eagle, McCall
Garden City44.16671.078

SH-44 west (North Glenwood Street) to SH-55 / North Glenwood Street – Eagle, McCall
Eastern terminus of SH-44; to SH-55 signed westbound only
Boise47.290–
47.31
76.106–
76.14


I-184 west to I-84
Westbound exit and eastbound entrance; interchange; eastern terminus of I-184
48.05077.329River Street —  Bogus BasinEastbound exit only; interchange
52.135–
52.412
83.903–
84.349
Federal WayInterchange
52.670–
52.824
84.764–
85.012
54

I-84 west / US 30 west / Commerce Avenue – Nampa
Western end of I-84/ US30 overlap; I-84 exit 54
See I-84 (see mile 54.485–140.405)
Gooding138.970223.651141

I-84 east to US 30 – Twin Falls, Bliss, Hagerman
Eastern end of I-84 overlap; Hagerman signed eastbound, Bliss westbound
Gooding150.110241.579 SH-46 (Main Street) – Wendell, FairfieldHospital signed eastbound only
LincolnShoshone165.928267.035
US 93 south (South Greenwood Street) / South Rail Street East – Twin Falls
Western end of US 93 overlap
165.968267.100
SH-75 north (North Greenwood Street) / North Rail Street West – Sun Valley
Southern terminus of SH-75
BlaineCarey204.281328.758
US 20 west (Queen Crown Road) / Cenarrusa Lane – Picabo, Sun Valley, Boise
Western end of US 20 overlap; Picabo signed northbound, Sun Valley and Boise southbound
ButteArco248.573400.039
US 93 north (North Front Street) / East Grand Avenue – Mackay, Salmon
Eastern end of US 93 overlap; Salmon signed westbound only
256.073412.110
SH-33 east – Howe
Western terminus of SH-33
272.0437.7
US 20 east / East Portland Avenue – Idaho Falls, Idaho National Laboratory
Eastern end of US 20 overlap; laboratory signed westbound only
Bingham305.743492.046
SH-39 south – Aberdeen
Northern terminus of SH-39
Blackfoot305.804–
305.893
492.144–
492.287
Snake River
305.930–
306.104
492.347–
492.627
93

I-15 south / I-15 BL south – Pocatello, Blackfoot
Western end of I-15 overlap; northern terminus of I-15 Bus.; I-15 exit 93
See I-15 (mile 92.734–115.610)
BonnevilleIdaho Falls328.980529.442116
I-15 north / West 33rd South – Idaho Falls, Butte
Eastern end of I-15 overlap; western end of I-15 Bus. overlap; southern terminus of I-15 Bus.; I-15 exit 116
331.102532.857
US 91 south (South Yellowstone Avenue) / West Sunnyside Road – Ammon
Northern terminus of US 91; destination signed eastbound only
333.044535.982



I-15 BL north / US 20 Bus. west (West Broadway Street) to I-15 / Elm Street – Butte, Arco
Eastern end of I-15 Bus. overlap; western end of US 20 Bus. overlap; To I-15, Butte signed eastbound only
334.374538.123

US 20 Bus. north (North Holmes Avenue) / North Holmes Avenue – West Yellowstone
Eastern end of US 20 Bus. overlap
Beachs Corner338.123–
338.240
544.156–
544.345

SH-43 north (North Yellowstone Highway) / Ammon Road – Rigby
Southern terminus of SH-43
347.787559.709

US 26 Bus. east (East Ririe Highway) / North 115th East Road – Rigby, Roberts, Ririe
Western terminus of US 26 Bus.; destinations signed eastbound only
349.294562.134


US 26 Bus. west (130th Road East) to SH-48 – Ririe
Eastern terminus of US 26 Bus.
Swan Valley376.950606.642
SH-31 north – Victor, Driggs
Southern terminus of SH-31
402.500647.761
US 26 east – Jackson
Continuation into Wyoming
1.000 mi = 1.609 km; 1.000 km = 0.621 mi

Ririe business route[edit]

Business plate.svg

U.S. Highway 26 Business marker

U.S. Highway 26 Business

LocationRirie
Length2.981 mi[1] (4.797 km)

U.S. Highway 26 Business (US-26 Bus.) is a 2.981-mile-long (4.797 km) business route in and around the small town of Ririe northeast of Idaho Falls. It connects US-26 to the community as well as SH-48.

Major intersections

CountyLocationmi[1]kmDestinationsNotes
Bonneville0.0000.000 US 26 (East Ririe Highway) / North 115th East – Idaho Falls, Pocatello, Swan ValleyWestern terminus of US 26 Bus.; continues as North 115th East beyond US 26
BonnevilleJefferson
county line
Ririe1.8913.043
SH-48 west (East County Line Road) – Rigby
Eastern terminus of SH-48
Bonneville28.98146.640 US 26 – Idaho Falls, Swan Valley, JacksonEastern terminus
1.000 mi = 1.609 km; 1.000 km = 0.621 mi

References[edit]

  1. ^ a b c d "State Highway System Route: 0026" (PDF). Idaho Transportation Department Milepoint Log. Idaho Transportation Department. January 25, 2016. Retrieved November 7, 2020.
  2. ^ a b Elbert, Chris; et al. (October 7, 2020). "ern end of US Highway 26". USEnds.com. Retrieved November 7, 2020.[self-published source]
  3. ^ a b c Google (August 6, 2021). "Overview map of US 26 in Idaho" (Map). Google Maps. Google. Retrieved August 6, 2021.
  4. ^ "Idaho Transportation Board Subcommittee on State Highway System Adjustments, September 21, 2022" (PDF). Idaho Transportation Department. September 21, 2022. p. 12. Retrieved February 12, 2023.
  5. ^ "State Highway System Route: 0020" (PDF). Idaho Transportation Department Milepoint Log. Idaho Transportation Department. January 25, 2016. Retrieved November 5, 2020.
  6. ^ "State Highway System Route: 0093" (PDF). Idaho Transportation Department Milepoint Log. Idaho Transportation Department. January 12, 2016. Retrieved November 6, 2020.
  7. ^ "State Highway System Route: 0015" (PDF). Idaho Transportation Department Milepoint Log. Idaho Transportation Department. January 25, 2016. Retrieved November 7, 2020.

External links[edit]

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