Low Elevation
< 460 feet above mean sea level
Low Place
Sangamon River
Low Quad Name
Oakford
Low PLSS
3-10-19N-8W
Low Geology
Cahokia Alluvium and till in river valley
High Elevation
> 645 feet above mean sea level
High Place
4 unnamed small upland hills
High Quad Name
Tallula
High PLSS
3-22-17N-8W
High Geology
Illinois Vandalia till member upland
Area
311.94 square miles
Total Relief
185 feet
Percent Slope
0.95%