2020 Map of Jacko Bay

About this map

Timbalier Bay and Terrebonne Bay dominate this coastal landscape, illustrating the fragile, water-bound geography of the Louisiana delta. This modern survey by the U.S. Geological Survey focuses on the complex transition between open water and disappearing landforms along the boundary of Terrebonne and Lafourche parishes. Named water bodies like Old Lady Lake and Lake Raccourci appear as large expanses of water, while smaller features such as Bayou de la Valle weave through the aquatic terrain. The map serves as a critical record of the shifting barrier features and low-lying land fragments, including the Fornation Islands, Bull Islands, and Pelican Islands. These features represent the last remnants of terrestrial geography before the open Gulf, providing essential data for those studying coastal erosion and the changing shoreline of Jacko Bay.