Low Elevation
< 420 feet above mean sea level
Low Place
Illinois and Mississippi Rivers
Low Quad Name
Grafton
Low PLSS
4-6-13S-1E
Low Geology
Cahokia Alluvium, river valley
High Elevation
> 815 feet above mean sea level
High Place
unnamed hilltop
High Quad Name
Foley
High PLSS
4-14-11N-2W
High Geology
Providence Moraine, Wisconsin end moraine
Area
280.66 square miles
Total Relief
395 feet
Percent Slope
3.55%