US 90) just west of SH 6 south to Interstate 69/U.S.

As of 2020[update], the highway has yet to be built.

The original SH 312 was designated on March 21, 1939, from Karnes City southwest to the Atascosa–Karnes county line.

[2] On September 26, 1939, this became part of SH 80.

This Texas road-related article is a stub.