Lowest and Highest Points in St. Clair County

Lowest and Highest Points in St. Clair County
Low Elevation: 
<360 feet above mean sea level
Low Place: 
Kaskaskia River
Low Quad Name: 
Red Bud
Low PLSS: 
3-32-3S-7W
Low Geology: 
Cahokia Alluvium, river valley
High Elevation: 
>700 feet above mean sea level
High Place: 
unnamed hilltop
High Quad Name: 
Columbia
High PLSS: 
3-13-1S-10W
High Geology: 
Vandalia till uplands over Mississippian Upper Valmeyeran
Area: 
666.66 square miles
Total Relief: 
340 feet
Percent Slope: 
0.99%