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Clay County
Low elevation: <400 feet above mean sea level
Place: Little Wabash River
7.5' quadrangle name: Enterprise
PLSS: 3-18-2N-9E
Geology: Equality Formation, Carmi member, lake bottom
High elevation: >625 feet above mean sea level
Place: unnamed hilltop
7.5' quadrangle name: Oskaloosa
PLSS: 3-8-4N-5E
Geology: Mapped as Glasford, probably Hagarstown ridge
Area: 464.22 square miles
Total relief (approximate): 225 feet
Average percent slope: 0.68%
State of Illinois | Illinois Department of Natural Resources | University of Illinois