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Warren County
Low elevation: <570 feet above mean sea level
Place: Cedar Creek
7.5' quadrangle name: Avon
PLSS: 4-1-8N-1W
Geology: Cahokia Alluvium in river valley
High elevation: >810 feet above mean sea level
Place: Unnamed hilltop
7.5' quadrangle name: Roseville
PLSS: 4-35-8N-3W
Geology: Kellerville till uplands
Area: 538.32 square miles
Total relief (approximate): 240 feet
Average percent slope: 0.96%
State of Illinois | Illinois Department of Natural Resources | University of Illinois