Broad Dyke is an original dyke in the United States built by the Dutch in 1655 in New Castle, Delaware. It is the center of the twelve mile circle that forms the arc that marks the northern state line (between Delaware and Pennsylvania). It was surveyed in 1701 by Empson and Pusey.
- "New Castle County Historical Markers - Broad Dyke"
- Delaware State Historical Markers Links to all official markers categorized by county.
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