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Brown County
Low elevation: <425 feet above mean sea level
Place: Illinois River
7.5' quadrangle name: Meredosia
PLSS: 4-36-2S-2W
Geology: Cahokia Alluvium, river valley
High elevation: >810 feet above mean sea level
Place: unnamed hilltop
7.5' quadrangle name: Clayton
PLSS: 4-32-1N-4W
Geology: Loess over Glasford diamicton
Area: 303.95 square miles
Total relief (approximate): 385 feet
Average percent slope: 2.13%
State of Illinois | Illinois Department of Natural Resources | University of Illinois