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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 U.S. Highways in Idaho are the segments of the United States Numbered Highway System owned and maintained by the Idaho Transportation Department (ITD) in the U.S. state of Idaho. Mainline highways
By the time Idaho was admitted to the Union as the 43rd state in 1890, a further eight counties had been created, bringing the total to 18. After Canyon, Fremont and Bannock Counties had been created, Alturas and Logan Counties were merged to form Blaine County in March 1895; Lincoln County was formed out of Blaine County later the same month ...
Media related to Roads in Idaho at Wikimedia Commons; Documents. Historic Survey of Roads in Idaho's State Highway System (2019) Maps. ITD Yearly Traffic Flow Maps, 1971–present; University of Alabama Maps of Idaho; Archive of ITD Maps, 1960s/70s and 2000s. Rand McNally maps, 1926 to 1957; 1936-1937 book of highway designations
official maps back to 1947; 1956 Gousha; meeting minutes back to 1951; traffic flow maps back to 1959; county maps back to 1962; Years before 1951 are therefore not the exact year a change was made. In 1953 a number was assigned to every unnumbered state highway, but these don't seem to be listed in one place. At the same time, duplicate ...
Originally a business loop that ran from exit 57 to exit 60 to Silverton via Silver Valley Road. Split into two separate spurs I-90 BS: 0.12: 0.19 I-90 exit 60 in Silverton: Silver Valley Rd south of Silverton — — Part of original loop that once ran from I-90 exit 57 in Osburn to exit 60 in Silverton via Silver Valley road. Split into two ...
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.
In the Idaho Falls area, US-26 runs along local streets and county roads. In 2022, the Idaho Transportation Board approved a study into relocating parts of the highway onto US-20 following the reconstruction of the I-15/US-20 interchange at the west end of the Rigby Freeway. [4]