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Macoupin County
Low elevation: <485 feet above mean sea level
Places: Hodges Creek and Macoupin Creek
7.5' quadrangle names: Medora and Greenfield
PLSS: 3-12-9N-10W and 3-30-10N-9W
Geology: Cahokia Alluvium and Glasford Till in river valleys
High elevation: >695 feet above mean sea level
Place: Unnamed hilltop
7.5' quadrangle name: Waverly
PLSS: 3-2-12N-8W
Geology: Thin Illinois Vandalia Till over Pennsylvanian Modesto Formation ridge
Area: 857.93 square miles
Total relief (approximate): 210 feet
Average percent slope: 0.86%
State of Illinois | Illinois Department of Natural Resources | University of Illinois