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Sangamon County
Low elevation: <500 feet above mean sea level
Place: Sangamon River
7.5' quadrangle name: Salisbury
PLSS: 3-22-17N-6W
Geology: Cahokia Alluvium in river valley
High elevation: >710 feet above mean sea level
Place: Unnamed hilltop
7.5' quadrangle name: Waverly
PLSS: 3-20-13N-7W
Geology: Illinoian Kellerville till upland
Area: 867.37 square miles
Total relief (approximate): 210 feet
Average percent slope: 0.62
State of Illinois | Illinois Department of Natural Resources | University of Illinois