Loop 436 was cancelled on September 25, 1989 to remove concurrent mileage with SH 149.

SH 149 begins at an interchange with US 59 (Future I-369 corridor) on the south side of Carthage.

At the interchange with Spur 572, the route leaves the beltway and heads northwest.

In Lakeport, near the East Texas Regional Airport, the highway intersects and runs concurrent with SH 322.

It passes under Interstate 20, only interchanging it with the north and south access roads.