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Shelby County
Low elevation: <505 feet above mean sea level
Place: Kaskaskia River
7.5' quadrangle name: Beecher City
PLSS: 3-15-9N-3E
Geology: Cahokia Alluvium in river valley
High elevation: ~829 feet above mean sea level
Place: Williamsville Hill
7.5' quadrangle name: Lakewood
PLSS: 3-23-10N-2E
Geology: Hagarstown ridge
Area: 759.95 square miles
Total relief (approximate): 324 feet
Average percent slope: 0.88%
State of Illinois | Illinois Department of Natural Resources | University of Illinois