Lowest and Highest Points in Mason County

Lowest and Highest Points in Mason County
Low Elevation: 
<435 feet above mean sea level
Low Place: 
Illinois River
Low Quad Name: 
Clear Lake
Low PLSS: 
3-5-19N-11W
Low Geology: 
Cahokia Alluvium, river valley
High Elevation: 
>730 feet above mean sea level
High Place: 
2 unnamed hills along a ridge
High Quad Name: 
Easton
High PLSS: 
3-25-20N-7W
High Geology: 
Parkland sand ridges
Area: 
557.44 square miles
Total Relief: 
295 feet
Percent Slope: 
0.54%
randomness