Low Elevation
< 430 feet above mean sea level
Low Place
Illinois and La Moine Rivers
Low Quad Name
Cooperstown
Low PLSS
4-9-1S-1W
Low Geology
Cahokia Alluvium, river valley
High Elevation
> 750 feet above mean sea level
High Place
unnamed hilltop
High Quad Name
Beardstown
High PLSS
4-1-1N-1W
High Geology
Hulic till uplands or Hagarstown
Area
436.62 square miles
Total Relief
320 feet
Percent Slope
2.00%