Lowest and Highest Points in Washington County

Lowest and Highest Points in Washington County
Low Elevation: 
<385 feet above mean sea level
Low Place: 
Kaskaskia River
Low Quad Name: 
Venedy
Low PLSS: 
3-30-1S-5W
Low Geology: 
Cahokia Alluvium, river valley
High Elevation: 
>583 feet above mean sea level
High Place: 
unnamed hilltop
High Quad Name: 
Oakdale
High PLSS: 
3-16-3S-4W
High Geology: 
Hagarstown ridge
Area: 
557.82 square miles
Total Relief: 
198 feet
Percent Slope: 
0.71%