LA 18 begins as an undivided, two lane road in downtown Donaldsonville as Bayou Road, which runs parallel to the Mississippi River. It intersects with the Sunshine Bridge (LA 70) east of Donaldsonville, the Veterans Memorial Bridge (LA 3213) in Wallace, and Interstate 310 near Luling as it continues downriver. At Bridge City, LA 18 leaves the river and briefly merges with U.S. Highway 90 northbound, then turns east along Seven Oaks Blvd. while U.S. 90 crosses the Mississippi River via the Huey P. Long Bridge. LA 18 meets and briefly conjoins the alternate river road, LA 541. When LA 18 enters Westwego, LA 18 becomes 4th Street but still continues parallel to the river. In Gretna, LA 18 turns south, away from the river: first onto Huey P. Long Avenue for one block, then east along 5th Street to Lafayette Street. LA 18 then goes south and ends at the intersection of Lafayette St. and the Westbank Expressway.
History
Between the junction with LA 52 in Luling and Huey P. Long Avenue in downtown Gretna, LA 18 is largely the original routing of U.S. Highway 90 (also LA 2 before the 1955 renumbering) and before that, the Old Spanish Trail highway. (One notable exception is that LA 18 is routed along Louisiana Street rather than the parallel Sala Avenue through Westwego's historic district.)
In Westwego, LA 18 turns from Louisiana Street onto 4th Street. LA 18 Spur continues southward for 0.6 miles (0.97km)[1] on Louisiana Street until it meets the Westbank Expressway (U.S. 90 Business).
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LA 1 / LA 3089 in Donaldsonville 
LA 20 in North Vacherie 
LA 3017 in Harvey 
US 90 Bus. / Future I-49 / LA 23 in Gretna 
