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Crawford County
Low elevation: <410 feet above mean sea level Place: Wabash River 7.5' quadrangle name: Russelville PLSS: 2-21-5N-10W Geology: Cahokia Alluvium High elevation: 640 feet above mean sea level Place: Unnamed hilltop 7.5' quadrangle name: Flat Rock PLSS: 2-35-6N-12W Geology: Illinois Vandalia till upland over Pennsylvanian Mattoon Formation? Area: 440.97 square miles Total relief (approximate): 230 feet Average percent slope: 0.91%
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| Updated 5/4/2007 JKH | |||