Lowest and Highest Points in Putnam County

Lowest and Highest Points in Putnam County
Low Elevation: 
<440 feet above mean sea level
Low Place: 
Illinois River
Low Quad Name: 
Henry
Low PLSS: 
3-33-31N-2W
Low Geology: 
Cahokia Alluvium, river valley
High Elevation: 
>740 feet above mean sea level
High Place: 
unnamed hilltop
High Quad Name: 
McNabb
High PLSS: 
3-17-32N-1W
High Geology: 
Mount Palatine Moraine
Area: 
170.51 square miles
Total Relief: 
300 feet
Percent Slope: 
1.77%
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