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Stark County
Low elevation: <600 feet above mean sea level
Place: Walnut Creek
7.5' quadrangle name: Laura
PLSS: 4-31-12N-5E
Geology: Cahokia Alluvium in river valley
High elevation: >875 feet above mean sea level
Places: 2 unnamed hilltops
7.5' quadrangle name: Castleton
PLSS: 4 -23 and 25-13N-7E
Geology: Buda Moraine crests
Area: 285.67 square miles
Total relief (approximate): 275 feet
Average percent slope: 0.95%
State of Illinois | Illinois Department of Natural Resources | University of Illinois