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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]
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.
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]
State Highway 21 (SH-21), also known as the Ponderosa Pine Scenic Byway, [2] is a state highway in Idaho.It runs from Boise to Stanley, primarily as a two-lane road.With two-thirds of its length in Boise County, it passes by historic Idaho City and the village of Lowman to the western edge of the Sawtooth Mountains, then along their northern boundary to Stanley.
US 93 Bus. north / US 30 (Idaho Byway) – Filer, Twin Falls City Center, Boise: Interchange Pole Line Road / 4100 North: Interchange; southbound exit and northbound entrance: Twin Falls: 49.455: 79.590: Blue Lakes Boulevard south (US 93 Bus. south) Snake River: I.B. Perrine Bridge over Snake River Canyon: Jerome 53.056: 85.385
Prior to the construction of I-84, the corridor was served by Idaho State Highway 2 and Route A of the Sampson Trails system. [2] [16] U.S. Route 30 was created in 1926 under the national numbered highway system, traveling through southern Idaho along the historic Oregon Trail.
The Idaho state government designated Route 2, the North Pacific Highway, between the Washington border and St. Regis Pass as part of its original numbered highway system in 1914. [24] Other sections of I-90 were built over the Yellowstone Trail and U.S. Route 10 , [ 25 ] though some parts of I-90 were cut as new roadway.
The Thousand Springs Scenic Byway is a picturesque section of US 30 in southern Idaho between the towns of Bliss and Buhl, dipping down into the Hagerman Valley and a canyon of the Snake River. The highway has four extensive concurrencies with Interstate Highways: Interstate 84 (I-84) twice, I-86 , and I-15 .
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