The road is still a major arterial for the city, providing access to Lackland Air Force Base, Kelly USA, and Brooks City-Base.

On June 14, 1947, a 2.7 miles (4.3 km) extension on its eastern end, brought the loop back to the west to Military Road.

[6] Loop 13 begins on the west side of San Antonio at US 90 north of Lackland Air Force Base.

It turns towards the east at the intersection with FM 2536 at Old Pearsall Road, just before a crossing over Leon Creek and a Union Pacific rail yard.

An intersection with Loop 353 (New Laredo Highway), which was the routing of US 81 when it still passed through town, provides access to Kelly USA.

It intersects Spur 536 at Roosevelt Avenue, which provides access to Stinson Airport and Mission San Jose.