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1965 Map of Spanish Fort NE

Name: 1965 Topographic Map of Spanish Fort NE
Creator: U.S. Geological Survey
Published: 1966
License: https://creativecommons.org/publicdomain/mark/1.0/

USGS Topo · Published 1966

About this map

Lake Pontchartrain dominates this mid-1960s hydrographic survey, revealing the vast expanse of open water where three Louisiana parishes meet. The Lake Pontchartrain Causeway (Toll) cuts a straight path across the western edge of the sheet, providing a vital transportation link between the north and south shores. This edition reflects the mid-century infrastructure of the region, featuring the Small Craft Passage and a Turnaround along the bridge structure.

Precise parish lines are a focal point of this mapping effort, showing the Indefinite Boundary where St Tammany Parish, Jefferson Parish, and Orleans Parish converge in the open water. These aquatic borders were essential for jurisdictional clarity in an era of increasing regional connectivity. The map serves as a detailed record of the lake's soundings and maritime navigation routes as they existed before subsequent decades of coastal and infrastructure development.