Louisiana Highway 18

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Louisiana Highway 18 marker

Louisiana Highway 18
Route information
Maintained by Louisiana DOTD
Length79.7 mi[1] (128.3 km)
Existed1955 renumbering–present
Major junctions
West end LA 1 / LA 3089 in Donaldsonville
  LA 20 in North Vacherie

LA 3213 in Wallace
LA 640 in Edgard
I-310 in Luling
US 90 in Bridge City
LA 45 in Marrero

LA 3017 in Harvey
East end
US 90 Bus. / LA 23 in Gretna
ParishesAscension, St. James, St. John the Baptist, St. Charles, Jefferson
Highway system
  • Louisiana Highway System
LA 17LA 19

Louisiana Highway 18 (LA 18) is a state highway that serves Ascension, St. James, St. John the Baptist, St. Charles, and Jefferson Parishes. Called the Great River Road, it runs from west to east, parallel to the west bank of the Mississippi River, running from Donaldsonville to Gretna. It spans a total of 79.7 miles (128.3 km).[1] In the more rural parts of LA 18's span, it is commonly referred to as River Road, but it becomes 4th Street once it enters Westwego.

Route description[edit]

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 shortly merges with U.S. Highway 90 but continues its eastward span while U.S. 90 crosses the Mississippi River via the Huey P. Long Bridge. When LA 18 enters Westwego, LA 18 becomes 4th Street but still continues alongside the river. In Gretna, LA 18 turns south, away from the river, onto Lafayette Street and ends at the intersection of Lafayette St. and the Westbank Expressway.


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.)

Major intersections[edit]

AscensionDonaldsonville0.00.0 LA 1 (West 10th Street) – Thibodaux, Plaquemine
LA 3089 east (Marchand Drive)
Western terminus;
Western terminus of LA 3089
3.15.0 LA 3120Northwestern terminus of LA 3120
St. James8.313.4 LA 70 – Donaldsonville, SorrentoLA 70 passes overhead via Sunshine Bridge across Mississippi River; indirect access via frontage road
Lagan20.432.8 LA 3219Northern terminus of LA 3219
North Vacherie26.542.6 LA 20 west – ThibodauxEastern terminus of LA 20
St. John the BaptistWallace30.949.7 LA 3213 north to I-10 – Gramercy
LA 3213 south – Donaldsonville
LA 3213 passes overhead via Gramercy Bridge over Mississippi River
33.954.6 LA 639Northern terminus of LA 639;
Unsigned junction
Edgard38.962.6 LA 640 northWest end of LA 640 concurrency;
LA 640 crosses Mississippi River via Reserve-Edgard Ferry to LA 44 and LA 53
39.162.9 LA 640 southEast end of LA 640 concurrency
St. CharlesKillona46.174.2 LA 3141 (Mary Plantation Road)Northern terminus of LA 3141
Taft48.277.6 LA 3142Northern terminus of LA 3142;
Unsigned junction
Hahnville51.883.4 LA 3160 (Home Place)Northeastern terminus of LA 3160
Luling55.188.7 I-310 north – New Orleans
I-310 south to US 90 – Boutte
I-310 passes overhead via Luling Bridge across Mississippi River
55.889.8 LA 52 (Paul Maillard Road) – BoutteNorthern terminus of LA 52
57.392.2 LA 3060 (Barton Avenue)Northern terminus of LA 3060
Jefferson69.7112.2 LA 541 (River Road) – Bridge CityWestern terminus of LA 541
70.1112.8 US 90 west – BoutteWest end of U.S. 90 concurrency
Bridge City71.0114.3 US 90 east – New OrleansEast end of U.S. 90 concurrency;
At Huey P. Long Bridge across Mississippi River
Westwego72.3116.4 LA 541 (River Road)West end of LA 541 concurrency
72.8117.2 LA 541 (River Road)East end of LA 541 concurrency
LA 18 Spur (Louisiana Street)
Northern terminus of LA 18 Spur
LA 45 south (Barataria Boulevard) to US 90 Bus. (West Bank Expressway)
Northern terminus of LA 45;
Junction includes incorrect signage
76.6123.3 LA 560-2 (Barataria Boulevard)Southern terminus of LA 560-2
Harvey77.6124.9 LA 3018 (Destrehan Avenue)Northern terminus of LA 3018;
Unsigned junction
77.6124.9 LA 541 (Destrehan Avenue)Eastern terminus of LA 541
77.7125.0Bridge over Harvey Canal
77.8125.2 LA 3017 (Peters Road, Bark Street)Northern terminus of LA 3017
Gretna79.2127.5 LA 466 (5th Street)Western terminus of LA 466;
Unsigned junction
US 90 Bus. (West Bank Expressway) – New Orleans
LA 23 (Lafayette Street, West Bank Expressway) – Belle Chasse
Southern terminus;
Partially unsigned junction
1.000 mi = 1.609 km; 1.000 km = 0.621 mi

Louisiana Highway 18 Spur[edit]

Louisiana Highway 18 Spur
Length0.62 mi[1] (1.00 km)

In Westwego, LA 18 turns from Louisiana Street onto 4th Street. LA 18 Spur continues southward for 0.6 miles (0.97 km)[1] on Louisiana Street until it meets the Westbank Expressway (U.S. 90 Business).

The entire highway is in Westwego, Jefferson Parish.

0.000.00 LA 18 (Louisiana Street, 4th Street)Northern terminus
US 90 Bus. (West Bank Expressway) – New Orleans
Southern terminus
1.000 mi = 1.609 km; 1.000 km = 0.621 mi


  1. ^ a b c d e f Microsoft; Nokia (November 5, 2012). "Map of LA 18 and Auxiliary Route(s)" (Map). Bing Maps. Microsoft. Retrieved November 5, 2012.

External links[edit]

Route map:

KML is from Wikidata