Lowest and Highest Points in Union County

Lowest and Highest Points in Union County
Low Elevation: 
<340 feet above mean sea level
Low Place: 
Cypress Creek and Mississppi River
Low Quad Name: 
Cypress and McClure
Low PLSS: 
3-36-13S-1E and 3-31-13S-3W
Low Geology: 
Cahokia Alluvium, river valley
High Elevation: 
>1 020 feet above mean sea level
High Place: 
Bald Knob
High Quad Name: 
Cobden
High PLSS: 
3-11-26N-3W
High Geology: 
Lower Devonian hill, the state's biggest, having over 620 feet of relief in a distance of about 1 mile
Area: 
417.84 square miles
Total Relief: 
680 feet
Percent Slope: 
3.15%
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