U.S. Route 26 in Idaho

U.S. Highway 26
US-26 highlighted in red
Route information
Maintained by ITD
Length	402.5 mi[1] (647.8 km)
Existed	1951 (1951)[2]–present
Major junctions
West end	US 20 / US 26 near Nyssa, OR
Major intersections	US 95 near Nyssa, OR I-84 / US 30 near Caldwell I-184 in Boise I-84 / US 30 in Boise US 93 in Shoshone US 20 in Carey I-15 / I-15 BL in Blackfoot US 91 in Idaho Falls
East end	US 26 near Alpine, WY
Location
Country	United States
State	Idaho
Counties	Canyon, Ada, Elmore, Gooding, Lincoln, Blaine, Butte, Bingham, Bonneville
Highway system
United States Numbered Highway System List Special Divided Idaho State Highway System Interstate US State
← 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.