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Jo Daviess County
Low elevation: <590 feet above mean sea level Place: Mississippi River 7.5' quadrangle name: Green Island PLSS: 4-31-26N-2E Geology: Cahokia Alluvium in river valley High elevation: 1235 feet above mean sea level Place: Charles Mound 7.5' quadrangle name: Shullsburg PLSS: 4-13-29N-2E Geology: Silurian limestone hill Area: 613.63 square miles Total relief (approximate): 645 feet Average percent slope: 4.25%
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| Updated 5/4/2007 JKH | |||