Adams County
Low elevation: <465 feet above mean sea level
Place: Mississippi River
7.5' quadrangle name: Marblehead
PLSS: 4-32-3S-8W
Geology: Cahokia Alluvium in river valley
High elevation: >860 feet above mean sea level
Place: unnamed hilltop
7.5' quadrangle name: Fishhook
PLSS: 4-35-3S-5W
Geology: Loess over Cretaceous hill
Area: 861.86 square miles
Total relief (approximate): 395 feet
Average percent slope: 1.41%
Updated 05/25/2011 SLD