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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%
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| Updated 5/7/2007 JKH | |||