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Effingham County
Low elevation: <450 feet above mean sea level
Place: Little Wabash River
7.5' quadrangle name: Hord
PLSS: 3-31-6N-6E
Geology: Cahokia Alluvium in river valley
High elevation: >680 feet above mean sea level
Place: Unnamed hilltop
7.5' quadrangle name: Altamont West
PLSS: 3-8-7N-4E
Geology: Hagarstown ridge
Area: 474.92 square miles
Total relief (approximate): 230 feet
Average percent slope: .75%
State of Illinois | Illinois Department of Natural Resources | University of Illinois