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Bond County
Low elevation: >~440 feet above mean sea level
Place: Carlyle Lake
7.5' quadrangle name: Keyesport
PLSS: 3-36-4N-2W
Geology: Lake in Kaskaskia River Valley (Cahokia Alluvium in valley)
High elevation: >760 feet above mean sea level
Place: unnamed hilltop
7.5' quadrangle name: Fillmore
PLSS: 3-36-7N-2W
Geology: Hagarstown ridge
Area: 378.66 square miles
Total relief (approximate): 320 feet
Average percent slope: .93%
State of Illinois | Illinois Department of Natural Resources | University of Illinois