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Dewitt County Low elevation: <605 feet above mean sea level Place: Salt Creek 7.5' quadrangle name: Chestnut PLSS: 3-7-19N-1E Geology: Cahokia Alluvium in river valley High elevation: >811 feet above mean sea level Place: Unnamed hilltop 7.5' quadrangle name: Heyworth PLSS: 3-21-21N-3E Geology: Heyworth Moraine Area: 400.71 square miles Total relief (approximate): 206 feet Average percent slope: 0.63%
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| Updated 5/7/2007 JKH | |||