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Whiteside County
Low elevation: <575 feet above mean sea level
Place: Mississippi River
7.5' quadrangle name: Clinton Illinois - Iowa
PLSS: 4-26-21N-2E
Geology: Cahokia Alluvium in river valley
High elevation: >875 feet above mean sea level
Place: 2 unnamed hills
7.5' quadrangle name: Milledgeville
PLSS: 4-3-22N-6E
Geology: Illinoian Ogle till uplands
Area: 691.50 square miles
Total relief (approximate): 300 feet
Average percent slope: 0.82%
State of Illinois | Illinois Department of Natural Resources | University of Illinois