Interstate 84 in Idaho

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.

This article is about the section of Interstate 84 in Idaho. For the entire route, see Interstate 84 (Oregon–Utah).

Interstate 84

Vietnam Veterans Memorial Highway
I-84 highlighted in red
Route information
Maintained by ITD
Length275.650 mi (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
  • Main
  • Auxiliary
  • Suffixed
  • Business
  • Future
  • Idaho State Highway System
  • Interstate
  • US
  • State
← SH-81→ I-86

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.

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