[2] The route has a spur that travels 0.26 miles (0.42 km) from LA 3000 west to a bridge at the Atchafalaya Basin Floodway levee.

It heads southeast on Rushing Road and intersects LA 3002 (South Range Avenue).

Louisiana Highway 3011 (LA 3011) runs 1.50 miles (2.41 km) in a north–south direction along Grand Caillou Road in Dulac, Terrebonne Parish.

LA 57 continues south toward Cocodrie and also straight ahead and to the north across Bayou Dulac toward Houma.

[11] LA 3011 was created with the 1955 Louisiana Highway renumbering,[12][13] and its route has remained the same to the present day.

[18] LA 3017 serves the industrial corridor situated along two sections of the Gulf Intracoastal Waterway and connects it with two major highways in the area, US 90 Bus.

The route heads southeast on Peters Road from LA 18 (4th Street) and parallels the portion of the waterway that follows the Harvey Canal.

Later, the route crosses Lapalco Boulevard, a main area thoroughfare, and passes Boomtown Casino.

Louisiana Highway 3018 (LA 3018) runs 0.73 miles (1.17 km) along Destrehan Avenue in Harvey, Jefferson Parish.

[20] LA 3018 was created with the 1955 Louisiana Highway renumbering, and until the 2000s, its route extended 1.0 mile (1.6 km) further south on Destrehan Avenue to Patriot Street.

Eastbound traffic turns south onto Pontchartrain Boulevard and immediately enters an interchange with I-10 and I-610.

[23] LA 3019 is a vestige of the original plans for the Pontchartrain Expressway and its connection to Veterans Highway, which at the time ended just west of the parish line in Metairie.

The remaining segment connecting Veterans Memorial Boulevard in Metairie with the I-10/I-610 interchange retains the LA 3019 designation.

LA 3021 engages in interchanges with both I-10 and I-610, passing over the Norfolk Southern Railway (NS) tracks in between, before ending at US 90 (Gentilly Boulevard).

The route ends at an intersection with LA 37/LA 64 (Greenwell Springs Road) just west of the Amite River.

The route formerly had a spur that traveled 0.20 miles (0.32 km) along South Hollywood Road to a junction with LA 24 in Houma.

Crossing South Hollywood Road, the local name changes to West Tunnel Boulevard.

The route then curves eastward and divides onto the one-way pair of Honduras and Bond Streets as it passes just south of the downtown area.

After about a dozen blocks, the travel lanes of LA 3040 converge, and the roadway passes through a tunnel underneath the Gulf Intracoastal Waterway.

Louisiana Highway 3049 (LA 3049) runs 22.76 miles (36.63 km) in a north–south direction from the concurrent US 71/LA 1 in Shreveport to a second junction with US 71 in Gilliam, Caddo Parish.