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2018 Map of Bouldin Island

Name: 2018 Topographic Map of Bouldin Island
Creator: U.S. Geological Survey
Published: 2018
License: https://creativecommons.org/publicdomain/mark/1.0/

USGS Topo · Published 2018

About this map

The San Joaquin River and its complex network of sloughs and cuts define this landscape where Sacramento County, San Joaquin County, and Contra Costa County meet. At the heart of the California Delta, large tract islands like Bouldin Island, Mandeville Island, and Venice Island are separated by intricate waterways including Potato Slough and Connection Slough. The presence of the Stockton Deep Water Channel cutting through Burns Reach and Three River Reach highlights the region's importance for maritime navigation.

On the western edge, the settlement of Bethel Island is visible with its residential grid and access roads like Sugar Barge Rd and Gateway Rd. The geography is shaped by human engineering, from the W Mandeville Levee Rd to the various "reaches" such as Hayes Reach and Venice Reach. This 2018 survey captures the contemporary state of these reclaimed lands, including smaller features like Quimby Island and the shallow San Andreas Shoal.