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Lawrence County
Low elevation: <395 feet above mean sea level
Place: Wabash River
7.5' quadrangle names: St. Francisville
PLSS: 2-29-2N-11W
Geology: Cahokia Alluvium in river valley
High elevation: >630 feet above mean sea level
Place: Red Hills Chapel
7.5' quadrangle name: Sumner
PLSS: 2-34-4N-13W
Geology: Illinois Vandalia till over Pennsylvanian Mattoon formation??
Area: 369.94 square miles
Total relief (approximate): 235 feet
Average percent slope: 0.84%
State of Illinois | Illinois Department of Natural Resources | University of Illinois