It runs 3.4 miles (5.5 km) from Farm to Market Road 1338 (FM 1338) to State Highway 16 (SH 16).

The route travels southwest to an intersection with SH 27 (Junction Highway), followed by a bridge over the Guadalupe River.

The route eventually turns east, reaching an intersection with FM 394 (Francisco Lemos Street) near Peterson Regional Medical Center.

The route then passes First United Methodist Church and Louise Hays Park, before turning southeast and reaching its eastern terminus at SH 16 (Sidney Baker Street) near River Hills Mall.

Spur 98 was extended west and north 1.2 miles (1.9 km) and redesignated as Loop 98 on April 29, 2010.