
The Mississippi River defines this landscape on the border of Missouri and Illinois, where intricate river navigation meets a complex system of sloughs and conservation lands. The western bank is dominated by the B K Leach Memorial State Conservation Area, a vast wetland network of Ligon Slough, Birch Slough, and numerous ponds such as Clear Pond and Knocker Ponds. Near the Missouri settlement of Foley, the landscape transitions from the protected bottomlands to organized agriculture protected by the Whiteside Levee.
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1903 · O'Fallon
USGS Topo · 1:125,000
1930 · Hardin
USGS Topo · 1:62,500
1931 · Brussels
USGS Topo · 1:62,500
1934 · Elsberry
USGS Topo · 1:48,000
1934 · Hardin
USGS Topo · 1:62,500
1938 · Hardin
USGS Topo · 1:62,500
1939 · Brussels
USGS Topo · 1:62,500
1941 · Troy
USGS Topo · 1:62,500
1942 · Elsberry
USGS Topo · 1:62,500
1943 · Brussels
USGS Topo · 1:62,500