Interstate 15 in Idaho

Interstate 15
I-15 highlighted in red
Route information
Maintained by ITD
Length	196 mi[1] (315 km)
NHS	Entire route
Major junctions
South end	I-15 at the Utah state line near Woodruff
Major intersections	US 91 near Arimo US 30 near McCammon I-86 in Pocatello US 26 in Blackfoot US 20 in Idaho Falls
North end	I-15 at the Montana state line at Monida Pass
Location
Country	United States
State	Idaho
Counties	Oneida, Bannock, Bingham, Bonneville, Jefferson, Clark
Highway system
Interstate Highway System Main Auxiliary Suffixed Business Future Idaho State Highway System Interstate US State
← SH-14 → SH-16

Interstate 15 (I-15) is a part of the Interstate Highway System that runs from San Diego, California, to Sweetgrass, Montana. In Idaho, the Interstate Highway runs exactly 196 miles (315 km) from the Utah state line near Woodruff north to the Montana state line at Monida Pass. I-15 is the primary north–south highway of Eastern Idaho. The Interstate Highway connects Pocatello and Idaho Falls, the fourth and fifth largest cities in Idaho, and the smaller county seats of Malad City, Blackfoot, and Dubois. I-15 connects all of those cities with Salt Lake City to the south and Butte to the north. The Interstate has business loops through McCammon, Inkom, Pocatello, Blackfoot, and Idaho Falls.