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Boone County
Low elevation: <725 feet above mean sea level
Place: Kishwaukee River
7.5' quadrangle name: Cherry Valley
PLSS: 3-31-44N-3W
Geology: Cahokia Alluvium, river valley
High elevation: 1050 feet above mean sea level
Place: unnamed hilltop
7.5' quadrangle name: Capron
PLSS: 3-12-46N-4E
Geology: Winnebago formation diamicton
Area: 279.87 square miles
Total relief (approximate): 325 feet
Average percent slope: 1.07%
State of Illinois | Illinois Department of Natural Resources | University of Illinois