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Hardin County
Low elevation: <300 feet above mean sea level
Place: Ohio River
7.5' quadrangle name: Shelterville
PLSS: 3-35-12S-7E
Geology: Cahokia Allumium, river valley
High elevation: >830 feet above mean sea level
Place: Unnamed hilltop
7.5' quadrangle name: Herod
PLSS: 3-1-11S-7E
Geology: Pennsylvanian Caseyville Sandstone ridge
Area: 179.48 square miles
Total relief (approximate): 530 feet
Average percent slope: 3.61%
State of Illinois | Illinois Department of Natural Resources | University of Illinois