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GrandIsle is a barrier island, bordered on the east by Barataria Pass and on the west by Caminada Pass.
GrandIsle is host to a variety of different bird species, and bird-watching enthusiast come from all over to observe the twice a year trans-gulf migratory birds that congregate there before continuing their journey.
GrandIsle is one of the few places that you can cruise slowly down the highway, on a light, breezy evening, and enjoy the smell of heavily seasoned boiling crabs at various camp sites along the roadsides.
GrandIsle State Park, on the east end of the island, is the only state-owned and operated beach on the Louisiana Gulf Coast, a beach frequented by people from the Greater New Orleans area.
GrandIsle was hit by a 3.6 foot storm surge on 22 August during the 1947 Atlantic hurricane season.
In 1928 the annual GrandIsle Tarpon Rodeo, a fishing tournament, was established on the island.