TN 22 Byp: Appeared as early as 1969 (bridge dates), though Tennessee Officials up through at least the 1972-73 edition do not show it.
TN 22 Byp ran around the west of Huntingdon and utilized 3/4 mile of existing US 70A.
In 1983, TN 22 Byp became TN 22, though it continues to show on maps and is posted in the field as 22 Bypass (even has an END shield at the north end).