On May 5, 1931, the southern section extended north to the Gaines–Terry county line, partially closing the gap.

[6] On January 25, 1938, it was extended south to Brownfield as SH 51 was under construction on a road to the west the bypassed Meadow.

[7] On February 11, 1938, SH 137 was extended south to Lamesa, but this was to be cancelled when ROW was acquired.

On August 20, 1940, the section of SH 137 from Midland to the Midland–Upton county line was cancelled, creating a gap.

On October 22, 1940, the sections of SH 137 from Lamesa to Midland and from the Midland–Upton county line to Rankin were also cancelled, expanding the gap.