Low Elevation
< 485 feet above mean sea level
Low Place
Hodges Creek and Macoupin Creek
Low Quad Name
Medora and Greenfield
Low PLSS
3-12-9N-10W and 3-30-10N-9W
Low Geology
Cahokia Alluvium and Glasford Till in river valleys
High Elevation
> 695 feet above mean sea level
High Place
unnamed hilltop
High Quad Name
Waverly
High PLSS
3-2-12N-8W
High Geology
Thin Illinois Vandalia Till over Pennsylvanian Modesto Formation ridge
Area
857.93 square miles
Total Relief
210 feet
Percent Slope
0.86%