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1947 Map of West Derniere

Name: 1947 Topographic Map of West Derniere
Creator: U.S. Geological Survey
Published: 1947
License: https://creativecommons.org/publicdomain/mark/1.0/

USGS Topo · Published 1947

About this map

Isles Dernieres stretches across the center of this coastal survey, marking a fragile boundary between the Caillou Bay and the open Gulf of Mexico. This 1935 field examination, compiled into a map in the late 1940s, documents the complex marsh and island system at the edge of Terrebonne Parish. The westernmost tip of this chain is defined by Coon Point, a prominent landmark for navigation into the protected waters of the bay.

Navigational channels like Grand Pass des Ilettes and Last Island Pass demonstrate the intricate hydrology of the Louisiana coastline before modern shoreline changes. The map includes detailed land lines added from General Land Office records, which are adjusted to natural features, providing a technical look at how maritime boundaries were defined during this era of coastal surveying by the U. S. Coast and Geodetic Survey.