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McLean County Low elevation: <600 feet above mean sea level Place: Sugar Creek 7.5' quadrangle name: Armington PLSS: 3-31-22N-1W Geology: Cahokia Alluvium and till in river valley High elevation: >950 feet above mean sea level Place: Unnamed hilltop 7.5' quadrangle name: Saybrook PLSS: 2-6-23N-6E Geology: Fletcher / Eureka / Normal Moraine complex Area: 1,174.05 square miles Total relief (approximate): 350 feet Average percent slope: 0.75%
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| Updated 5/7/2007 JKH | |||