Most common species found in 1989 and 1999 surveys.
| Species | 1999 (%) | 1989 (%) |
|---|---|---|
| Silver maple (Acer saccharinum) | 10.5 | 13.4 |
| Pin oak (Quercus palustris) | 6.1 | 6.0 |
| Green ash (Fraxinus pennsylvanica) | 5.9 | 5.4 |
| Sugar maple (Acer saccharum) | 5.9 | 10.0 |
| Siberian elm (Ulmus pumila) | 4.6 | 8.5 |
| Sweetgum (Liquidambar styraciflua) | 4.2 | 4.7 |
| % of trees in the top six species | 37.2 | 48.0 |