|terminus_b= near Lebanon
|counties=Dickson, Hickman, Williamson, Rutherford, Wilson
Tennessee State Route 840 (SR 840), also designated as Tennessee National Guard Parkway, is a state highway around Nashville, Tennessee, built and directed by the Tennessee Department of Transportation (TDOT). First proposed by former Governor Lamar Alexander as part of a system of Bicentennial Parkways, construction began in 1991 and was completed in 2012. The roadway is long,〔 and it serves the cities of Lebanon, Murfreesboro, Franklin, and Dickson.
The SR 840 project was initiated in 1986 with the passage of the Better Roads Program in the Tennessee legislature.〔 While initially referred to as Interstate 840 (I-840) in the state plan,〔 the highway was constructed entirely with state transportation funds and is officially referred to as a state route. The first contract for construction was signed in 1991, and work progressed in stages. The section of road between I-40 at Lebanon and I-24 near Murfreesboro was completed in November 1996, between I-24 and I-65 near Franklin in October 2001, and between I-40 near Dickson and SR 100 in December 2002.〔 Due to high costs and environmental concerns, the proposed northern half of SR 840 was indefinitely placed on hold in 2003.〔 As work moved into Williamson County, residents filed complaints and eventually lawsuits in an effort to have TDOT address both environmental and aesthetic issues, considerably slowing work in that county.〔 The full southern route of SR 840 was opened on November 2, 2012.〔 The project took 26 years to complete at a cost of $753.4 million.〔
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