State Route 840

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. At 77.28 miles (124.37 km) long, it is the tenth-longest auxiliary Interstate Highway in the nation. The route serves the cities of Lebanon, Murfreesboro, Franklin, and Dickson, all suburbs of Nashville.
 
 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. 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 renamed I-840 and that resigning work would begin.

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Length of Route
77.28 mi.

Begins:
I-40 near Dickson​

Ends:
I-40 near Lebanon​

Counties Covered:
Dickson, Hickman, Williamson, Rutherford, Wilson​

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