1948 Map of Llano Seco, 1977 Print
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1948 Map of Llano Seco

USGS Topo · Published 1977

About this map

Rancho Llano Seco sits at the heart of this landscape, reflecting the enduring influence of the Mexican land grant system on the Central Valley's geography. The Sacramento River forms the western boundary, characterized by complex hydrology including Hartley Island and numerous oxbow features like The Lagoon and Perkins Lake. These remnants of former river channels are interspersed with sloughs and lakes, such as Angel Slough and Eddy Lake, illustrating the natural flood patterns of the region before modern extensive water management.


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Map Details

Date Portrayed1948
Date Published1977
PublisherU.S. Geological Survey
Map TypeTopographic
Scale1:24,000
Physical Dimensions22 x 26.9 inches

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Source Details

CopyrightPublic Domain