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1950 Map of Llano Seco

Name: 1950 Topographic Map of Llano Seco
Creator: U.S. Geological Survey
Published: 1950
License: https://creativecommons.org/publicdomain/mark/1.0/

USGS Topo · Published 1950

About this map

Sacramento River meanders define the western edge of this 1950 survey, where the river's dynamic flow has shaped a landscape of islands and cut-off water bodies like The Lagoon and Hartley Island. Historically significant land grants dominate the interior, including the expansive Rancho de Farwell and the namesake Rancho Llano Seco. These agricultural lands are tied to the river by Parrott Landing and Hites Landing, which once served as vital points for commerce and transport.

The central and eastern portions of the map reveal a complex network of irrigation and drainage infrastructure essential for the region's farming economy. Systems like the Western Canal and Odell Canal intersect with natural waterways such as Angel Slough and Little Butte Creek. Evidence of early industrial activity appears at the Grain Elevator and a Gravel Pit, while the Mt Diablo Meridian provides a stark geometric contrast to the winding oxbows of Eddy Lake and Perkins Lake.