On December 2, 1931, this route became an extension of SH 9. On June 2, 1932, SH 115 was redesignated on a new route as a short route between Pyote through Wink to Kermit.
The route in question became part of SH 9 on December 2, 1931, and was later reassigned to a new route between Pyote, Wink, and Kermit on June 2, 1932.