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DeKalb County
Low elevation: <630 feet above mean sea level
Place: Somonauk Creek
7.5' quadrangle name: Somonauk
PLSS: 3-34-37N-5E
Geology: Cahokia Alluvium in river valley
High elevation: 940 feet above mean sea level
Place: Unnamed hilltop
7.5' quadrangle name: Genoa
PLSS: 3-10-41N-5E
Geology: Elburn Moraine complex
Area: 629.22 square miles
Total relief (approximate): 310 feet
Average percent slope: 0.74%
State of Illinois | Illinois Department of Natural Resources | University of Illinois