It runs 35.4 miles (57.0 km) in a northwest to southeast direction from U.S. Highway 165 (U.S. 165) in Fenton to LA 26 north of Lake Arthur.

From this point to its terminus north of Lake Arthur, LA 102 travels in a north–south direction and is bannered accordingly.

It proceeds east along a section line road known as Fenton Highway and immediately crosses the Union Pacific Railroad tracks.

Here, LA 97 reaches its southern terminus, and U.S. 90 continues west parallel with I-10 toward Lake Charles.

It continues south for four more sections then turns west onto Dugas Road and shortly ends at an intersection with LA 26 about 2.5 miles (4.0 km) north of Lake Arthur.

[4] LA 102 was created with the 1955 Louisiana Highway renumbering, and its route has remained unchanged to the present day.