Louisiana Highway 574 (LA 574) is a collection of eight current and four former state-maintained streets in Grand Isle, located in lower Jefferson Parish. All twelve routes were established with the 1955 Louisiana Highway renumbering. Current routes Louisiana Highway 574-1 Louisiana Highway 574-1 (LA 574-1) spans from south to north along Central Avenue. While in the Grand Isle city limits, the route is actually on Cheniere Caminada, the last part of the mainland approaching the bridge to Grand Isle. Ending at dead ends in both directions, LA 574-1 crosses LA 1 immediately to the west of the Caminada Pass bridge. Louisiana Highway 574-3 Louisiana Highway 574-3 (LA 574-3) spans from south to north along Santiny Lane. From the south, LA 574-3 begins at an intersection with LA 1 and ends at a dead end just to the north. Louisiana Highway 574-4 Louisiana Highway 574-4 (LA 574-4) spans from south to north along Chighizola Lane. From the south, LA 574-4 begins at an intersection with LA 1 and ends at a dead end just to the north. Louisiana Highway 574-5 Louisiana Highway 574-5 (LA 574-5) spans from south to north along Ludwig Lane. From the south, LA 574-5 begins at an intersection with LA 1 and proceeds north to Medical Avenue. Louisiana Highway 574-6 Louisiana Highway 574-6 (LA 574-6) spans from south to north along Naccari Lane. From the south, LA 574-6 begins at an intersection with LA 1 and ends at a dead end just to the north. Louisiana Highway 574-7 Louisiana Highway 574-7 (LA 574-7) spans from south to north along Hector Lane. From the south, LA 574-7 begins at an intersection with LA 1 and ends at a dead end just to the north. Louisiana Highway 574-8 Louisiana Highway 574-8 (LA 574-8) spans from south to north along Landry Lane. From the south, LA 574-8 begins at an intersection with LA 1 and ends at a dead end just to the north. Louisiana Highway 574-9 Louisiana Highway 574-9 (LA 574-9) spans from south to north along Cemetery Lane. From the south, LA 574-9 begins at an intersection with LA 1 and ends at a dead end just to the north. Former routes Louisiana Highway 574-2 Louisiana Highway 574-2 (LA 574-2) spanned from south to north along Burnett Lane. It began at the shore of the Gulf of Mexico and proceeded north to an intersection with LA 1 immediately