Lowest and Highest Points in DeKalb County

Lowest and Highest Points in DeKalb County
Low Elevation: 
<630 feet above mean sea level
Low Place: 
Somonauk Creek
Low Quad Name: 
Somonauk
Low PLSS: 
3-34-37N-5E
Low Geology: 
Cahokia Alluvium, river valley
High Elevation: 
>940 feet above mean sea level
High Place: 
unnamed hilltop
High Quad Name: 
Genoa
High PLSS: 
3-10-41N-5E
High Geology: 
Elburn Moraine complex
Area: 
629.22 square miles
Total Relief: 
310 feet
Percent Slope: 
0.74%