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Clark County
Low elevation: <430 feet above mean sea level
Place: Wabash River
7.5' quadrangle name: West Union
PLSS: 2-4-8N-11W
Geology: Cahokia Alluvium in river valley
High elevation: >735 feet above mean sea level
Place: unnamed hilltop
7.5' quadrangle name: Westfield East
PLSS: 2-21-12N-14W
Geology: Nevins Moraine
Area: 499.36 square miles
Total relief (approximate): 305 feet
Average percent slope: 1.14%
State of Illinois | Illinois Department of Natural Resources | University of Illinois