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Menard County Low elevation: <460 feet above mean sea level Place: Sangamon River 7.5' quadrangle name: Oakford PLSS: 3-10-19N-8W Geology: Cahokia Alluvium and till in river valley High elevation: >645 feet above mean sea level Place: 4 unnamed small upland hills 7.5' quadrangle name: Tallula PLSS: 3-22-17N-8W Geology: Illinois Vandalia till member upland Area: 311.94 square miles Total relief (approximate): 185 feet Average percent slope: 0.98%
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| Updated 5/7/2007 JKH | |||||