Low Elevation
< 530 feet above mean sea level
Low Place
Mississippi River
Low Quad Name
Keithsburg
Low PLSS
4-34-13N-5W
Low Geology
Cahokia Alluvium, river valley
High Elevation
> 820 feet above mean sea level
High Place
unnamed hilltop
High Quad Name
Reynolds
High PLSS
4-5-15N-2W
High Geology
Illinois Vandalia till member upland
Area
562.12 square miles
Total Relief
290 feet
Percent Slope
1.35%