
Grafton and the high bluffs of Pere Marquette State Park dominate the northern landscape, where a series of hollows like Distillery Hollow and Jerseyville Hollow cut through the rugged Illinois terrain. The confluence of the Illinois River and Mississippi River creates a complex network of islands and chutes, including Mason Island and Calhoun Point. South of the rivers, the land flattens into the Portage Des Sioux floodplain in Missouri.
54 named features on this map. Tap any name to fly to it.
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4 editions found
1903 · O'Fallon
USGS Topo · 1:125,000
1924 · Robertson
USGS Topo · 1:24,000
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
1935 · Florissant
USGS Topo · 1:24,000