Until the 1976 renumbering, most of SR 397 was State Route 59, defined by 1937.[2] At one point, SR 397 only used Westergard Road east of Westfall Road, turning north there to return to I-80/US 95 at Perth.[3] Later, possibly when SR 860 was added, Westfall Road was dropped and SR 397 was extended west to meet SR 860.
Major intersections
This section is missing mileposts for junctions. Please help by adding them.