The monument is in a transition zone of several vegetation communities. The monument was created from the acquisition of private land that had been farmed and logged altering the native vegetation mosaic. Results of monument vegetation surveys combined with information from federal land surveys show that a mosaic of forest, savanna, and prairie covered the monument. Prairie and savanna dominated ridges and south facing slopes. Forests pockets were likely found on north facing slopes and in the river floodplain.
Did You Know?
Ellison Orr was 92 years old when Effigy Mounds National Monument was dedicated. The Monument owes much to his accurate maps, and careful cataloguing of hundreds of sites and artifacts. Orr died in 1951, leaving most of his personal collection of manuscripts, artifacts, and samples to the monument.