The route travels alongside Bayou Terrebonne, connecting Montegut with the community of Bourg, which is located just beyond Klondyke.

It heads northward along the bayou on a narrow strip of land within the marshes of lower Terrebonne Parish, passing a series of elevated boat houses.

Soon afterward, LA 55 crosses a vertical lift bridge over the Humble Canal and enters the community of Montegut.

[2][4][5] The highway then bends to the northwest with Bayou Terrebonne and continues for a final 4.2 miles (6.8 km) to an area known as Klondyke, just southeast of Bourg.

The route ends at an intersection with LA 24, which continues northwest along the bayou toward Houma and east to Larose via the Bourg-Larose Highway.

On the southwest, a locally-maintained vertical lift bridge connects to Klondyke Road on the opposite side of the bayou.

The highway was originally projected to extend further south to a point on Bayou Terrebonne near Bay La Fleur off Lake Barre.

[3][12] La DOTD is currently engaged in a program that aims to transfer about 5,000 miles (8,000 km) of state-owned roadways to local governments over the next several years.