This 1856 U.S. Coast Guard survey map shows the landforms and estuary, then known as San Antonio Creek. Note the extensive marshlands and the land connection of Alameda ("The Encinal") to the Brooklyn mainland. That connection was severed by the construction of the tidal canal in the 1890s.

This 1856 U.S. Coast Guard survey map shows the landforms and estuary, then known as San Antonio Creek.  Note the extensive marshlands and the land connection of Alameda ("The Encinal") to the Brooklyn mainland.  That connection was severed by the construction of the tidal canal in the 1890s. - Bill Threlfall, 2009

Image courtesy of the United States Coast Guard.

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