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Pope County
Low elevation: <315 feet above mean sea level
Place: Ohio River
7.5' quadrangle name: Little Cypress
PLSS: 3-6-17S-7E
Geology: Cahokia Alluvium in river valley
High elevation: ~1064 feet above mean sea level
Place: Williams Hill
7.5' quadrangle name: Herod
PLSS: 3-7-11S-7E
Geology: Pennsylvanian Tradewater formation ridge
Area: 370.46 square miles
Total relief (approximate): 749 feet
Average percent slope: 3.76%
State of Illinois | Illinois Department of Natural Resources | University of Illinois