Tennessee State Route 397

State Route 397
Mack Hatcher Memorial Parkway
Route information
Maintained by TDOT
Length	9.7 mi[1] (15.6 km)
Existed	1983–present
Component highways	SR 397 / US 31 Truck / US 431 Truck
Major junctions
South end	US 31 in Franklin
Major intersections	US 431 in Franklin SR 96 in Franklin US 31 in Franklin US 431 in Franklin
North end	SR 96 in Franklin
Location
Country	United States
State	Tennessee
Counties	Williamson
Highway system
Tennessee State Routes Interstate US State
← SR 396 → SR 399

State Route 397 (SR 397), also known as Mack Hatcher Memorial Parkway, is a primary state route that serves as a perimeter road for the city of Franklin, Tennessee. Throughout its length, SR 397 also carries the designations of U.S. Route 31 Truck (US 31 Truck) and U.S. Route 431 Truck (US 431 Truck). The route connects multiple U.S. and state routes, and serves as a bypass around the business district of Franklin, as well as a major thoroughfare.

A route to bypass Franklin was first proposed in 1963, although major work did not begin until the late 1970s. The eastern part of SR 396 was constructed in three phases between 1983 and 1989. Since Franklin has grown rapidly since the road's initial construction, it is planned to be extended to form a full circumferential loop. The first phase of the extension was completed in 2021, with the final phase planned to complete the loop. The entire route is also planned to be eventually widened to four lanes.