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Williamson County
SR 840 South
From West of Bending Chestnut Road to East of Thompson Station Road
A Context Sensitive Solution Project

Looking east at I-40 and the SR-840 interchange in Dickson County.


The purpose of 840 is to provide economic development opportunities in areas around Middle Tennessee.  A positive by-product of the four-lane controlled access highway is reducing traffic on the urban Nashville interstate highway system. 


State Route 840 is paid for with state funds from highway user fees, which include gas and diesel taxes and license plate renewal fees. These highway user fees, paid for by motorists in Tennessee, are dedicated to highway purposes.  By state law, that means they cannot be used for other state programs. 

Project History

State Route 840 was proposed by Governor Lamar Alexander and approved by the Tennessee General Assembly in 1986 as part of the Better Roads Program. Planning work started in 1988, with the first actual construction in 1991. 

Project Facts

  • The leg between I-24 in Rutherford County and I-65 in Williamson County is 23.8 miles long.  More than 47 miles of SR-840 are now open to traffic between I-40 in Wilson County and I-65 south of Franklin. Of the 31 remaining miles which encompasses the 3rd leg, almost 23 miles are already under contract. Nearly 11 miles in the middle of the 3rd leg (I-65 to I-40 at Dickson) are in right-of-way purchase, but are not under active construction.
  • A total of $403 million dollars has been obligated to date on the southern loop.
  • The first leg of SR-840 opened in November of 1996 between I-40 and I-24 and is 23.2 miles long.
  • 840 County Mileage:
    • Wilson County-13 miles
    • Rutherford County-20 miles
    • Williamson County-37 miles
    • Hickman County-2 miles
    • Dickson County-6 miles
  • Once completed, the southern loop will be 78 miles in length.
  • The southern loop is expected to cost a total of $490 million.

The newly completed portion of SR-840 near Bending Chestnut Road
in Williamson County meets a section still under construction, fall 2002.