Lowest and Highest Points in McLean County
Low elevation:
<600 ft above mean sea
level
Place: Sugar Creek
7.5' quadrangle name: Armington
PLSS: 3-31-22N-1W
Geology: Cahokia Alluvium and till in
river valley
High elevation: >950 ft above mean
sea level
Place: Unnamed hilltop
7.5' quadrangle name: Saybrook
PLSS: 2-6-23N-6E
Geology: Fletcher / Eureka / Normal
Moraine complex
Area: 1,174.05 square miles
Total relief (approximate):
350 feet
Average percent slope: 0.75%
level
Place: Sugar Creek
7.5' quadrangle name: Armington
PLSS: 3-31-22N-1W
Geology: Cahokia Alluvium and till in
river valley
High elevation: >950 ft above mean
sea level
Place: Unnamed hilltop
7.5' quadrangle name: Saybrook
PLSS: 2-6-23N-6E
Geology: Fletcher / Eureka / Normal
Moraine complex
Area: 1,174.05 square miles
Total relief (approximate):
350 feet
Average percent slope: 0.75%
Updated 05/27/2011 SLD