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The Idaho Transportation Department (ITD) is responsible for the establishment and classification of a state highway network, including 5,000 miles (8,000 km) of roads that are classified as Interstate Highways, U.S. Highways, and state highways within the state of Idaho in the United States. [1]
The Interstate Highways in Idaho are the segments of the Dwight D. Eisenhower National System of Interstate and Defense Highways owned and maintained by the Idaho Transportation Department (ITD) in the U.S. state of Idaho. The state has five Interstate Highways that total approximately 611 miles (983 km) in length. [1]
US-95 continues into Idaho from southeastern Oregon as an undivided two-lane highway for the majority of its length. As it is the state's primary north–south highway, Idaho is in the process of widening US-95 to an Interstate-style divided four-lane highway, from the Oregon state line in the southwest to Eastport at the northern border with Canada at Kingsgate, British Columbia.
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.
US 191 near Malad City: US 191 at Targhee Pass: 1926: 1978 Replaced by I-15 US 195: 0.577: 0.929 ... List of state highways in Idaho; References External links. Media ...
The highway crosses into Elmore County and rejoins the Union Pacific Railroad's Nampa Subdivision as it passes the Morley Nelson Snake River Birds of Prey National Conservation Area. [11] I-84 then travels around the city of Mountain Home, while a signed business route serves the city center and leads to the nearby Mountain Home Air Force Base.
Interstate 90 (I-90) is a transcontinental Interstate Highway that runs east–west across the northern United States. Within the state of Idaho, the freeway travels for 74 miles (119 km) from the Washington border near Spokane to Coeur d'Alene and the panhandle region at the north end of the state.
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).