Low Elevation
< 560 feet above mean sea level
Low Place
Sangamon River
Low Quad Name
Niantic
Low PLSS
3-28-16N-1W
Low Geology
Cahokia Alluvium, river valley
High Elevation
> 745 feet above mean sea level
High Place
unnamed hilltop
High Quad Name
Long Creek
High PLSS
3-17-16N-4E
High Geology
Cerro Cordo Moraine
Area
579.62 square miles
Total Relief
185 feet
Percent Slope
0.63%