Lowest and Highest Points in Williamson County

 Lowest and Highest Points in Williamson County
Low Elevation: 
<350 feet above mean sea level
Low Place: 
Big Muddy River
Low Quad Name: 
De Soto
Low PLSS: 
3-19-8S-1E
Low Geology: 
Cahokia Alluvium / Equality Formation, Carmi Member in river valley
High Elevation: 
>680 feet above mean sea level
High Place: 
unnamed hilltop
High Quad Name: 
Lick Creek
High PLSS: 
3-35-10S-1E
High Geology: 
Pennsylvanian Abbot Formation
Area: 
439.51 square miles
Total Relief: 
330 feet
Percent Slope: 
1.19%