Lowest and Highest Points in Winnebago County

Lowest and Highest Points in Winnebago County
Low Elevation: 
<680 feet above mean sea level
Low Place: 
Rock River
Low Quad Name: 
Kishwaukee
Low PLSS: 
3-19-43N-1E
Low Geology: 
Cahokia Alluvium, river valley
High Elevation: 
>980 feet above mean sea level
High Place: 
unnamed hilltop
High Quad Name: 
Durand
High PLSS: 
4-7-29N-10E
High Geology: 
Thin Ogle till over Galena Platteville ridge
Area: 
515.20 square miles
Total Relief: 
300 feet
Percent Slope: 
1.73%