Saint Clair County topographic maps
Click on a map to view its topography, its elevation and its terrain.

Cahokia Mounds State Historic Site
United States > Illinois > Saint Clair County > Fairmont City
To the south of Monks Mound is the Grand Plaza, a large area that covered roughly 50 acres (20 ha) and measured over 1,600 ft (490 m) in length by over 900 ft (270 m) in width. Researchers originally thought the flat, open terrain in this area reflected Cahokia's location on the Mississippi's alluvial flood…
Average elevation: 420 ft

Dutch Hollow
United States > Illinois > Saint Clair County > Belleville > Dutch Hollow
Average elevation: 558 ft