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Hancock County
Low elevation: <480 feet above mean sea level
Place: Mississippi River
7.5' quadrangle name: Canton MO-IL
PLSS: 4-36-3N-10W
Geology: Cahokia Allumium, river valley
High elevation: >750 feet above mean sea level
Place: Gittings Mound
7.5' quadrangle name: Lomax
PLSS: 4-35-7N-6W
Geology: Hagarstown ridge
Area: 805.69 square miles
Total relief (approximate): 270 feet
Average percent slope: 1.17%
State of Illinois | Illinois Department of Natural Resources | University of Illinois