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Jersey County
Low elevation: <420 feet above mean sea level
Place: Mississippi River
7.5' quadrangle name: Elsah
PLSS: 3-36-6N-11W
Geology: Cahokia Alluvium in river valley
High elevation: >885 feet above mean sea level
Place: Unnamed hilltop
7.5' quadrangle name: Otterville
PLSS: 3-36-7N-13W
Geology: Mississippian Kinderhookian limestone ridge
Area: 373.43 square miles
Total relief (approximate): 465 feet
Average percent slope: 2.17%
State of Illinois | Illinois Department of Natural Resources | University of Illinois