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1978 Map of Union Island
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1978 Map of Union Island

USGS Topo · Published 1978

About this map

Union Island is a complex landscape of reclaimed delta lands defined by an intricate network of levees, canals, and pumping stations in the late 1970s. The northern reaches are characterized by the Gas Field and schools like Delta Island Sch, while the southern portion transition into the growing outskirts of Tracy. This map captures the intersection of heavy hydraulic engineering and agriculture, where the Middle River and Old River navigate through the El Pescadero (Pico and Naglee) land grant. The presence of numerous Pumping Stations and specialized water features like the Industrial Waste Ponds and the Fabian and Bell Canal illustrates the intensive management required to maintain these low-lying tracts for industrial and residential use. From the Landing Strip on the island to the emerging neighborhoods like Larch Clover Park, the map documents a region in the midst of suburban expansion into traditional ranchlands.

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Map Details

Date Portrayed1978
Date Published1978
PublisherU.S. Geological Survey
Map TypeTopographic
Scale1:24,000
Physical Dimensions21.4 x 26.6 inches

Editions of this 1978 Union Island Map

This is the sole edition of this map. No revisions or reprints were ever made.

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Source Details

SourceU.S. Geological Survey
CopyrightPublic Domain