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2017 Map of Saint Clair Flats

Name: 2017 Topographic Map of Saint Clair Flats
Creator: U.S. Geological Survey
Published: 2017
License: https://creativecommons.org/publicdomain/mark/1.0/

USGS Topo · Published 2017

About this map

The intricate delta of the Saint Clair Flats marks the aquatic boundary between Michigan and Ontario, where the Saint Clair River branches into Lake Saint Clair. This landscape is defined by a complex network of marshes, islands, and narrow waterways known as highways, such as the Belt Highway and Baltimore Highway. The primary landmasses like Harsens Island and Dickinson Island are connected to smaller features including McDonald Island and Bruckner Island, many of which supported seasonal and permanent residences reached only by water or narrow roads.

Settlement patterns follow the shoreline, with Riverside and Miller situated along the mainland-adjacent reaches. The map details an extensive system of named water routes like Broad Cut and Johnnies Highway, reflecting the historical importance of boat travel in this unique freshwater delta. Land-based navigation is largely confined to specialized routes like S Channel DR and Drummond Highway which trace the edge of the Middle Channel Saint Clair River.