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Piatt County
Low elevation: <620 feet above mean sea level
Place: Sangamon River
7.5' quadrangle name: Cerro Gordo
PLSS: 3-10-17N-4E
Geology: Cahokia Alluvium in river valley
High elevation: 820 feet above mean sea level
Place: unnamed hilltop
7.5' quadrangle name: Mahomet
PLSS: 3-26-21N-6E
Geology: Champaign Moraine
Area: 434.62 square miles
Total relief (approximate): 200 feet
Average percent slope: 0.46%
State of Illinois | Illinois Department of Natural Resources | University of Illinois