U.S. Route 90 in Louisiana
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| Route information | ||||
| Maintained by Louisiana DOTD | ||||
| Length: | 297.6 mi (478.9 km) | |||
| Existed: | 1926 – present | |||
| Major junctions | ||||
| West end: |
  I-10 / US 90 at Texas state line east of Orange, TX
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  I-10 / US 171 / I-210 in Lake Charles US 165 in Iowa US 167 in Lafayette I-310 in Boutte US 90 Bus. west of Westwego  I-10 / US 90 Bus. / US 61 in New Orleans I-610 in New Orleans US 11 in Eastern New Orleans US 190 east of Slidell
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| East end: |
US 90 at Mississippi state line west of Pearlington, MS
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| Location | ||||
| Parishes: | Calcasieu, Jefferson Davis, Acadia, Lafayette, St. Martin, Iberia, St. Mary, Assumption, Terrebonne, Lafourche, St. Charles, Jefferson, Orleans, St. Tammany | |||
| Highway system | ||||
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U.S. Highway 90 in Louisiana (US 90), one of the major east–west U.S. Highways in the Southern United States, runs through southern Louisiana for 297.6 miles (478.9 km), serving Lake Charles, Lafayette, New Iberia, Morgan City, and New Orleans. Much of it west of Lafayette and east of New Orleans has been supplanted by Interstate 10 (I-10) for all but local traffic, but the section between Lafayette and New Orleans runs a good deal south of I-10.
The stretch between Lafayette and New Orleans is planned as a southern extension of Interstate 49 and is signed as "future corridor I-49". This part of the highway is important to the offshore petroleum industry, as it connects the cities of Lafayette and New Orleans to the port cities along the coast. Most of U. S. 90 from New Iberia to New Orleans, that has not already been improved to interstate grade, is mainly an expressway, excepting the towns traversed through, that can be easily upgraded to freeway standards. The freeway east of Morgan City, bypassing Houma to the north, was originally built as Louisiana Highway 3052; US 90 was shifted to it from its former alignment (now Louisiana Highway 182) once it was completed.
US 90 replaced almost all of the Louisiana section of the San Diego–St. Augustine Old Spanish Trail. It was also designated Louisiana Highway 2 until the 1955 renumbering. A long section of the old road, from Lafayette to northeast of Raceland, is now Louisiana Highway 182.
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