Illinois River wetlands and the complex alluvial floodplain of the central Mississippi valley dominate this landscape, where the river winds between Twelvemile Island and Helmbold Island. The eastern bluffs rise sharply from the water, creating distinctive local landmarks such as The Narrows and Dug Hill. This region is defined by its seasonal hydrology, where expansive backwaters like The Glades, Flat Lake, and Upper Stump Lake create a sprawling network of marshlands and sloughs between the river and the rising timbered ridges.
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This is the sole edition of this map. No revisions or reprints were ever made.
1903 · O'Fallon
USGS Topo · 1:125,000
1927 · St. Charles
USGS Topo · 1:62,500
1930 · Hardin
USGS Topo · 1:62,500
1930 · Jerseyville
USGS Topo · 1:62,500
1931 · Brussels
USGS Topo · 1:62,500
1933 · Jerseyville
USGS Topo · 1:62,500
1933 · Saint Charles
USGS Topo · 1:62,500
1934 · Hardin
USGS Topo · 1:62,500
1938 · Hardin
USGS Topo · 1:62,500
1939 · Brussels
USGS Topo · 1:62,500