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White County
Low elevation: <340 feet above mean sea level
Place: Wabash River
7.5' quadrangle name: Emma
PLSS: 3-27-7S-10E
Geology: Cahokia Alluvium in river valley
High elevation: >580 feet above mean sea level
Place: Boyd Hill
7.5' quadrangle name: Centerville
PLSS: 3-2-4S-9E
Geology: Thin Illinois Vandalia till over Pennsylvanian Mattoon Formation ridge
Area: 496.49 square miles
Total relief (approximate): 240 feet
Average percent slope: 0.91%
State of Illinois | Illinois Department of Natural Resources | University of Illinois