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Bureau County
Low elevation: <450 feet above mean sea level
Place: Illinois River
7.5' quadrangle name: Florid
PLSS: 4-32-15N-10E
Geology: Cahokia Alluvium, river valley
High elevation: >950 feet above mean sea level
Place: unnamed hilltop
7.5' quadrangle name: Whitefield
PLSS: 4-34-15N-8E
Geology: Providence Moraine, Wisconsin end moraine
Area: 865.96 square miles
Total relief (approximate): 500 feet
Average percent slope: 1.23%
State of Illinois | Illinois Department of Natural Resources | University of Illinois