Lowest and Highest Points in Cass County

Lowest and Highest Points in Cass County
Low Elevation: 
<420 feet above mean sea level
Low Place: 
Illinois River
Low Quad Name: 
Cooperstown
Low PLSS: 
3-33-17N-13W
Low Geology: 
Cahokia Alluvium in river valley
High Elevation: 
>680 feet above mean sea level
High Place: 
Unnamed hilltop
High Quad Name: 
Clear Lake
High PLSS: 
3-14-18N-11W
High Geology: 
Loess over Glasford Till upland
Area: 
379.55 square miles
Total Relief: 
260 feet
Percent Slope: 
0.96%