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Monroe County
Low elevation: <375 feet above mean sea level
Place: Mississippi River
7.5' quadrangle name: Bloomsdale
PLSS: 3-21-5S-10W
Geology: Cahokia Alluvium in river valley
High elevation: >800 feet above mean sea level
Place: Unnamed hilltop
7.5' quadrangle name: Valmeyer
PLSS: 3-11-3S-11W
Geology: loess hills over Mississippian Middle Valmeyeran limestone
Area: 393.49 square miles
Total relief (approximate): 425 feet
Average percent slope: 1.74%
State of Illinois | Illinois Department of Natural Resources | University of Illinois