Lowest and Highest Points in Macon County
Low elevation: <560 feet above mean sea level
Place: Sangamon River
7.5' quadrangle name: Niantic
PLSS: 3-28-16N-1W
Geology: Cahokia Alluvium in river valley
High elevation: 745 feet above mean sea level
Place: Unnamed hilltop
7.5' quadrangle name: Long Creek
PLSS: 3-17-16N-4E
Geology: Cerro Cordo Moraine
Area: 579.62 square miles
Total relief (approximate): 185 feet
Average percent slope: 0.63%
Updated 9/30/2009 JKH