From the late 1950s through the 1960s, SH-30 extended south to the Texas state line. On February 18, 1958, the highway was extended to run west along US-62, then split off to the south  east of the north–south Texas state line.
From the late 1950s through the 1960s, SH-30 ran south to the Texas border. On February 18, 1958, it was extended west along US-62 and then split off southeast of the north-south Texas state line.