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Interstate 81 in Tennessee
 Interstate 81 | ||||
|---|---|---|---|---|
 I-81 highlighted in red | ||||
| Route information | ||||
| Maintained by TDOT | ||||
| Length | 75.66 mi[1] (121.76 km) | |||
| Existed | August 14, 1957[2]–present | |||
| History | Completed August 27, 1975[3] | |||
| NHS | Entire route | |||
| Major junctions | ||||
| South end |  I-40 near Dandridge | |||
| ||||
| North end |  I-81 at the Virginia state line in Bristol | |||
| Location | ||||
| Country | United States | |||
| State | Tennessee | |||
| Counties | Jefferson, Hamblen, Greene, Washington, Sullivan | |||
| Highway system | ||||
| ||||
Interstate 81 (I-81) is part of the Interstate Highway System that runs 855.02 miles (1,376.02 km) northward from Dandridge, Tennessee, to the Thousand Islands Bridge at the Canadian border near Fishers Landing, New York. In Tennessee, I-81 serves the northeastern part of the state, running 75.66 miles (121.76 km) from its southern terminus with I-40 in Dandridge to the Virginia state line in Bristol. The route serves the Tri-Cities region of the state and the eastern parts of the Knoxville metropolitan area, terminating about 35 miles (56 km) east of Knoxville. I-81 bypasses most cities that it serves, instead providing access via interchanges with state and federal routes. It remains in the Ridge-and-Valley topographic region of the Appalachian Mountains for its entire length in Tennessee, and runs in a northeast to southwest direction.
I-81 roughly follows the corridors of U.S. Routes 11E and 11W in Tennessee, but unlike many stretches of Interstate Highways, does not closely parallel any U.S. Numbered Highway until it reaches Bristol. The first parts of I-81 in the state were constructed in the early 1960s, with additional progress made on the Interstate throughout that decade. However, most of the route was constructed later than the other Interstate Highways initially allocated to Tennessee, and did not open until after 1970. The last stretch of I-81 in Tennessee, which was more than half of the entire route in the state, was completed in 1975. From 1985 to 2007, the Interstate had one auxiliary route, I-181, which was renumbered as part of I-26.
- ^ "Table 1: Main Routes of the Dwight D. Eisenhower National System Of Interstate and Defense Highways". FHWA Route Log and Finder List. Federal Highway Administration. December 31, 2021. Retrieved July 14, 2022.
- ^ Public Roads Administration (August 14, 1957). Official Route Numbering for the National System of Interstate and Defense Highways as Adopted by the American Association of State Highway Officials (Map). Washington, DC: Public Roads Administration. Retrieved June 14, 2018 – via Wikimedia Commons.
- ^ Cite error: The named reference
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