Low Elevation
< 640 feet above mean sea level
Low Place
Rock River
Low Quad Name
Sterling
Low PLSS
4-30-21N-8E
Low Geology
Cahokia Alluvium, river valley
High Elevation
> 985 feet above mean sea level
High Place
unnamed hilltop
High Quad Name
Paw Paw
High PLSS
3-36-38N-2E
High Geology
La Moille / Paw Paw Moraines
Area
722.21 square miles
Total Relief
345 feet
Percent Slope
0.95%