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2020 Map of Central Isles Dernieres

Name: 2020 Topographic Map of Central Isles Dernieres
Creator: U.S. Geological Survey
Published: 2020
License: https://creativecommons.org/publicdomain/mark/1.0/

USGS Topo · Published 2020

About this map

Isles Dernieres and the remains of Whiskey Island stand as a fragile barrier against the open waters of the Gulf of Mexico. This coastal landscape in Terrebonne Parish is defined by a complex network of estuarine waters, where Pelican Lake and Bay Round dominate the interior marshes. The map documents the intricate hydrography of the Louisiana coast, featuring numerous tidal passes and channels such as Grand Pass des Ilettes, Pass Wilson, and the significant Whiskey Pass.

The aquatic environment is punctuated by named bayous and bays like Pelican Bayou and Bay California, illustrating the dynamic interface between fresh and saltwater systems. Notable features like Caillou Boca and Coupe Nouvelle indicate the shifting nature of these barrier islands and the navigable inlets used by local mariners. This survey provides a baseline for understanding the rapid geomorphic changes characteristic of this specific stretch of the Gulf Coast.