
The Illinois River corridor dominates this 1990 survey, carving a wide valley through the heart of West Central Illinois. Along its banks, the Meredosia National Wildlife Refuge and Pike Co State Conservation Area preserve the river's ecological character, while the surrounding uplands are defined by an intricate network of tributaries like McKee Creek and Mauvaise Terre Creek. This landscape represents a mature agricultural and transport hub at the close of the twentieth century, where the Norfolk Southern Railway and Burlington Northern Railroad intersect the river's historic trade routes.
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1890 · Louisiana
USGS Topo · 1:125,000
1909 · Tallula
USGS Topo · 1:62,500
1923 · Carlinville
USGS Topo · 1:48,000
1923 · Rushville
USGS Topo · 1:62,500
1924 · Winchester
USGS Topo · 1:48,000
1924 · Waverly
USGS Topo · 1:62,500
1924 · Roodhouse
USGS Topo · 1:62,500
1924 · Griggsville
USGS Topo · 1:62,500
1925 · Carlinville
USGS Topo · 1:62,500
1925 · Liberty
USGS Topo · 1:62,500