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Douglas County
Low elevation: <620 feet above mean sea level
Place: Embarras River
7.5' quadrangle name: Oakland
PLSS: 3-5-14N-10E
Geology: Cahokia Alluvium in river valley
High elevation: >720 feet above mean sea level
Place: Unnamed hilltop
7.5' quadrangle name: Newman
PLSS: 2-5-16N-14W
Geology: West Ridge Moraine
Area: 412.83 square miles
Total relief (approximate): 100 feet
Average percent slope: 0.40%
State of Illinois | Illinois Department of Natural Resources | University of Illinois