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Logan County
Low elevation: <510 feet above mean sea level
Places: Salt Creek and Sugar Creek
7.5' quadrangle names: New Holland and Middleton
PLSS: 3-30-20N-4W
Geology: Cahokia Alluvium in river valley
High elevation: 771 feet above mean sea level
Place: Elkhart Hill
7.5' quadrangle name: Broadwell
PLSS: 3-18-18N-3W
Geology: Le Roy Moraine
Area: 612.32 square miles
Total relief (approximate): 261 feet
Average percent slope: 0.67%
State of Illinois | Illinois Department of Natural Resources | University of Illinois