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McHenry County
Low elevation: <730 feet above mean sea level
Place: Fox River
7.5' quadrangle name: Crystal Lake
PLSS: 3-34-43N-8E
Geology: Cahokia Alluvium in river valley
High elevation: ~1189 feet above mean sea level
Place: Unnamed hilltop
7.5' quadrangle name: Harvard
PLSS: 3-17-46N-6E
Geology: Woodstock / Marengo Moraine
Area: 606.12 square miles
Total relief (approximate): 459 feet
Average percent slope: 1.24%
State of Illinois | Illinois Department of Natural Resources | University of Illinois