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Dewitt County
Low elevation: <605 feet above mean sea level
Place: Salt Creek
7.5' quadrangle name: Chestnut
PLSS: 3-7-19N-1E
Geology: Cahokia Alluvium in river valley
High elevation: >811 feet above mean sea level
Place: Unnamed hilltop
7.5' quadrangle name: Heyworth
PLSS: 3-21-21N-3E
Geology: Heyworth Moraine
Area: 400.71 square miles
Total relief (approximate): 206 feet
Average percent slope: 0.63%
State of Illinois | Illinois Department of Natural Resources | University of Illinois