In the early 1960s, construction began on the first project that would eventually relocate US 90 and US 167 onto a new four-lane alignment between Opelousas and Raceland.

Between the late 1960s and early 1980s, the relocation of US 90 was extended in stages from Broussard to Morgan City.

Its extension west to Gray around 1983 remained as LA 3052 for over twenty years until the final section east from Morgan City was opened about 1997.

Louisiana Highway 3057 (LA 3057) ran 2.46 miles (3.96 km) in a general southeast to northwest direction along Commerce Street in a loop off of US 61 in St.

[9] The route was deleted in 2018 as part of the La DOTD's Road Transfer program.

[13] The route serves as a connector between its termini, crossing several railroad tracks at grade and passing through a residential neighborhood.

Louisiana Highway 3064 (LA 3064) runs 4.41 miles (7.10 km) in a north–south direction along Staring Lane and Essen Lane from Burbank Drive to LA 73 (Jefferson Highway) in Baton Rouge, East Baton Rouge Parish.

State maintenance continues a short distance east of US 90 onto Corne Road to the entrance to Zoosiana (the Zoo of Acadiana).

[25] The route is a western bypass of Lafayette that also serves as a primary commercial corridor for the growing suburbs southwest of the city.

Louisiana Highway 3075 (LA 3075) is the designation for the state-maintained approaches to the defunct White Castle Ferry across the Mississippi River in Iberville Parish.

The route was deleted in 2018 as part of the La DOTD Road Transfer program.

It spans a total of 2.2 miles (3.5 km) largely over a former alignment of both U.S. 11 and U.S. 90 in the town of Pearl River.

It spanned 6.2 miles (10.0 km) in a west–east direction[32] along the present route of LA 39 between New Orleans and Chalmette.

Louisiana Highway 3086 (LA 3086) runs 7.05 miles (11.35 km) in Jefferson Davis Parish.

It heads north as an undivided four-lane highway and immediately crosses a vertical lift bridge over Bayou Terrebonne, intersecting LA 659 on the opposite bank.

LA 3087 continues north along Prospect Boulevard, becoming a divided four-lane highway, and crosses a high-level fixed span bridge over the Gulf Intracoastal Waterway.

The route immediately crosses a bridge over Bayou Lafourche and intersects LA 308 on the opposite bank.

LA 3089 was originally the designation for the Sunshine Bridge and its approaches upon its opening to traffic in 1964.

[41] The route, located on the Gulf of Mexico, is vital to the area's oil/gas and seafood industries.

The northern terminus is located opposite the south end of the Gateway to the Gulf Expressway on LA 1, the only link to the rest of the state highway system.

Louisiana Highway 3093 (LA 3093) runs 4.01 miles (6.45 km) in Wright, Vermillion Parish.

The route initially heads north on a bypassed former alignment of US 165 through a forested area within the village of Georgetown.