Low Elevation
< 425 feet above mean sea level
Low Place
Illinois River
Low Quad Name
Meredosia
Low PLSS
4-36-2S-2W
Low Geology
Cahokia Alluvium, river valley
High Elevation
> 810 feet above mean sea level
High Place
unnamed hilltop
High Quad Name
Clayton
High PLSS
4-32-1N-4W
High Geology
Loess over Glasford diamicton
Area
303.95 square miles
Total Relief
385 feet
Percent Slope
2.13%