Lowest and Highest Points in Greene County
Low elevation: <420 feet above mean sea level
Place: Illinois River
7.5' quadrangle name: Nutwood
PLSS: 3-24-8N-14W
Geology: Cahokia Alluvium in river valley
High elevation: >690 feet above mean sea level
Place: Unnamed hilltop
7.5' quadrangle name: Bedford
PLSS: 3-2-12N-13W
Geology: Loess over Glasford till, perhaps over Mississippian Kinderhookian limestone
Area: 541.04 square miles
Total relief (approximate): 270 feet
Average percent slope: 1.36%
Updated 9/30/2009 JKH