The confluence of the Illinois River and Mississippi River creates a complex landscape of islands, chutes, and ridges along the Illinois-Missouri border. The town of Grafton sits on the northern bank, where narrow valleys like Distillery Hollow and Mason Hollow cut through the high ground of River Ridge. To the south, across the water, the Missouri side transitions into the low-lying wetlands of Marais Temps Clair and the flat agricultural lands around Orchard Farm. This area is defined by its maritime and aviation infrastructure, from the Grafton Ferry crossing to the St Charles County Smartt Airport and various private airstrips.
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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