2025 Map of Calumet Island

About this map

Casse-tete Island and Calumet Island sit as isolated landforms within the expanse of Timbalier Bay, illustrating the fragile coastal geography of Lafourche Parish. This 2025 survey documents the shifting barrier island system where East Timbalier Island separates the inland bay waters from the open Gulf of America. The map reveals a landscape defined almost entirely by its relationship with water, where land is a series of fragmented landmasses rather than continuous terrain. This specific representation serves as a contemporary benchmark for coastal change, capturing the current footprint of these islands before further tidal or storm-driven erosion alters their profiles. For those studying Louisiana’s maritime borders, the proximity of these features to the open Gulf provides a clear look at the state's vulnerable southernmost reaches.