 The modern LA 45 was formerly a portion of Route 30 that, due to an anomaly in its original legislative route description, extended southward off of the main route at Marrero.It followed what was then known as the "Barataria Road" alongside Bayous Des Familles and Barataria to the fishing community of Lafitte.The other, shorter branch of Route 30 continued downriver from Marrero through Gretna to the Algiers Ferry landing and became Route 30-D around 1940.