Low Elevation
< 575 feet above mean sea level
Low Place
Mississippi River
Low Quad Name
Clinton Illinois - Iowa
Low PLSS
4-26-21N-2E
Low Geology
Cahokia Alluvium, river valley
High Elevation
> 875 feet above mean sea level
High Place
2 unnamed hills
High Quad Name
Milledgeville
High PLSS
4-3-22N-6E
High Geology
Illinoian Ogle till uplands
Area
691.50 square miles
Total Relief
300 feet
Percent Slope
0.82%