Louisiana Highway 20 is a state highway

State highway

State highway, state road or state route can refer to one of three related concepts, two of them related to a state or provincial government in a country that is divided into states or provinces :#A...

 that serves Terrebonne Parish, Lafourche Parish, and St. James Parish. It spans a total of 39.07 miles (62.9 km) as a two lane, undivided road.

Route description

From the south, LA 20 begins at Business U.S. Highway 90 in the northwest Terrebonne Parish town of Gibson. The road parallels then intersects the main US 90 (Future I-49) at two locations (Exits 189 & 194) as it heads northeastward, where it intersects LA 24

Louisiana Highway 24

Louisiana Highway 24 is a state highway in Louisiana that serves Lafourche and Terrebonne Parishes. It spans and is bannered east/west.-Route description:...

 in Schriever. LA 20 turns due north and intersects LA 1 in Thibodaux as it continues northward. The road then passes through Chackbay before it enters St. James Parish. LA 20 runs northward through South Vacherie and dead ends at an intersection with LA 18 in North Vacherie.

Before the completion of the Gramercy Bridge

Gramercy Bridge

The Gramercy Bridge , is a cantilever bridge over the Mississippi River connecting Gramercy, Louisiana in St. James Parish with St. John the Baptist Parish...

, LA 20 crossed a ferry in Lutcher

Lutcher, Louisiana

Lutcher is a town in St. James Parish, Louisiana, United States, on the East Bank of the Mississippi River. The population was 3,735 at the 2000 census.-Geography:Lutcher is located at ....

, continued down present-day LA 3274

Louisiana Highway 3274

Louisiana Highway 3274 is a state highway in Louisiana that serves St. James Parish. It spans in a south to north direction. It is known locally as Airline Avenue.-Route description:...

 to intersect with Airline Highway

Airline Highway

Airline Highway is a divided highway in the U.S. state of Louisiana, built in the 1930s and 1940s to bypass the older Jefferson Highway. It carries U.S. Highway 61 from New Orleans northwest to Baton Rouge, and U.S. Highway 190 from Baton Rouge west over the Mississippi River on the Huey P. Long...

.