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2012 Map of Union Island

Name: 2012 Topographic Map of Union Island
Creator: U.S. Geological Survey
Published: 2012
License: https://creativecommons.org/publicdomain/mark/1.0/

USGS Topo · Published 2012

About this map

Union Island is defined by an intricate network of waterways and levee-protected tracts just west of the Central Valley. The landscape reveals a sophisticated irrigation and drainage system dominated by the Grant Line Canal and the Fabian and Bell Canal, which frame the northern agricultural fields. These man-made channels intersect with natural meandering features like Old River and Salmon Slough, illustrating the century-long effort to reclaim the San Joaquin Delta for productive use.

Industrial and agricultural operations are dispersed throughout the region, from the Union Island Gas Field in the north to family-linked enterprises such as Ornellas Dairy further south. The southern edge of the map transitions into the residential and commercial periphery of Tracy, marked by a tightening grid of streets including N Tracy Blvd and E Pescadero Ave, as development pushes toward the older levee systems.