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Stephenson County
Low elevation: <690 feet above mean sea level
Place: East Plum River
7.5' quadrangle name: Loran
PLSS: 4-34-26N-5E
Geology: Cahokia Alluvium in river valley
High elevation: >1160 feet above mean sea level
Place: Unnamed hilltop
7.5' quadrangle name: Lena
PLSS: 4-13-28N-5E
Geology: Winslow till member
Area: 560.06 square miles
Total relief (approximate): 470 feet
Average percent slope: 2.29%
State of Illinois | Illinois Department of Natural Resources | University of Illinois