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Carroll County
Low elevation: <585 feet above mean sea level
Place: Mississippi River
7.5' quadrangle name: Clifton NW
PLSS: 4-34-23N-7E
Geology: Cahokia Alluvium in river valley
High elevation: >1060 feet above mean sea level
Place: unnamed hilltop
7.5' quadrangle name: Brookville
PLSS: 4-32-25N-7E
Geology: Glasford till over Ordovician dolomite
Area: 462.70 square miles
Total relief (approximate): 475 feet
Average percent slope: 2.54%
State of Illinois | Illinois Department of Natural Resources | University of Illinois