Interstate 84 in Idaho

Interstate 84 marker
Interstate 84
Vietnam Veterans Memorial Highway
Map
I-84 highlighted in red
Route information
Maintained by ITD
Length275.650 mi[1] (443.616 km)
NHSEntire route
Major junctions
West end I-84 at Oregon state line
Major intersections
East end I-84 at Utah state line
Location
CountryUnited States
StateIdaho
CountiesPayette, Canyon, Ada, Elmore, Gooding, Jerome, Minidoka, Cassia, Oneida
Highway system
  • Idaho State Highway System
SH-81 I-86

Interstate 84 (I-84) in the U.S. state of Idaho is a major Interstate Highway that traverses the state from the Oregon state line in the northwest to Utah state line in the southeast. It primarily follows the Snake River across a plain that includes the cities of Boise, Mountain Home, and Twin Falls. The highway is one of the busiest in Idaho and is designated as the Vietnam Veterans Memorial Highway.

I-84 runs for 276 miles (444 km) within Idaho, beginning near Ontario, Oregon, and traveling concurrent with several U.S. routes through the Boise metropolitan area and Mountain Home towards Twin Falls. I-84 splits away from US 30 and the Snake River at a junction with I-86 near Declo, where it turns southeast to cross the Sublett Range into northern Utah. The highway has an auxiliary route, I-184, which serves downtown Boise.