Lowest and Highest Points in Jefferson County
Low elevation: <410 feet above mean sea level
Place: Rend Lake
7.5' quadrangle name: Waltonville
PLSS: 3-16-4S-2E
Geology: Lake in river valley
High elevation: >630 feet above mean sea level
Place: Unnamed hilltop
7.5' quadrangle name: Kell
PLSS: 3-2-1S-2E
Geology: Vandalia till upland over Pennsylvanian Mattoon Formation Hagarstown ridge
Area: 577.55 square miles
Total relief (approximate): 220 feet
Average percent slope: 0.95%
Updated 9/30/2009 JKH