Lowest and Highest Points in Morgan County
Low elevation: <430 feet above mean sea level
Place: Illinois River
7.5' quadrangle name: Meredosia
PLSS: 3-32-16N-13W
Geology: Cahokia Alluvium in river valley
High elevation: >705 feet above mean sea level
Places: 2 unnamed hilltops
7.5' quadrangle names: Alexander and Jacksonville
PLSS: 3-23-14N-9W and 3-30-14N-9W
Geology: Vandalia till uplands over Pennsylvanian Modesto Formation
Area: 566.72 square miles
Total relief (approximate): 275 feet
Average percent slope: 0.92%
Updated 10/1/2009 JKH