On October 28, 1987, a loop around Carthage was completed, with SH 149 being routed around the western side of town along Loop 436. The old routing that entered Carthage was re-designated Spur 572.
On October 28, 1987, a new loop around Carthage was implemented for SH 149, which now travels along Loop 436 on the western side of town. The old route into Carthage was changed to Spur 572.