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Du Page County Low elevation: <580 feet above mean sea level Place: Des Plaines River 7.5' quadrangle name: Sag Bridge PLSS: 3-16-37N-11E Geology: River valley cut into Silurian/Devonian dolomite High elevation:820 feet above mean sea level Place: Unnamed hilltop 7.5' quadrangle name: Lombard PLSS: 3-28-40N-10E Geology: Kenneyville Moraine Area: 333.51 square miles Total relief (approximate): 240 feet Average percent slope: 0.88%
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| Updated 5/3/2007 JKH | |||