Tennessee National Guard Parkway | ||||
I-840 highlighted in red | ||||
Route information | ||||
Auxiliary route of I-40 | ||||
Maintained by TDOT | ||||
Length | 77.28 mi[1] (124.37 km) | |||
Existed | August 12, 2016[2]–present | |||
History | Completed November 2, 2012 (as SR 840) | |||
NHS | Entire route | |||
Major junctions | ||||
West end | ![]() | |||
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East end | ![]() | |||
Location | ||||
Country | United States | |||
State | Tennessee | |||
Counties | Dickson, Hickman, Williamson, Rutherford, Wilson | |||
Highway system | ||||
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Interstate 840 (I-840), formerly State Route 840 (SR 840), is a freeway that serves as an outer bypass route around Nashville, Tennessee. Built by the Tennessee Department of Transportation (TDOT), it is also designated as Tennessee National Guard Parkway.[3] At 77.28 miles (124.37 km) long, it is the tenth-longest auxiliary Interstate Highway in the nation.[4] The route serves the cities of Lebanon, Murfreesboro, Franklin, and Dickson, all suburbs of Nashville.[5][6]
First proposed by former Governor Lamar Alexander as part of a system of Bicentennial Parkways, I-840 was constructed between 1991 and 2012. The highway was originally planned as an Interstate Highway but was constructed entirely with state funds and initially designated as a state route for this reason.[3] In 2015, the Federal Highway Administration (FHWA) and the American Association of State Highway and Transportation Officials (AASHTO) approved TDOT's request to redesignate SR 840 as I-840 as part of its integration into the Interstate Highway System. On August 12, 2016, TDOT announced that the route had officially been redesignated as I-840 and that resigning work would begin.[2]
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