Southwestern Mesic Forest, Oak Savanna and Prairie Upland - southern zone. From Spring Green south on State Hwy. C, then east on County Hwy. Bottoms access via park trails.
Dominant trees are silver maple, green ash, cottonwood, swamp white oak, and American elm.
The shrubs range from sparse under the closed canopy to quite dense where natural gaps have occurred, with buttonbush, prickly ash, and silky dogwood dominating. Especially common are climbing vines of grape, woodbine, wild yam, and poison ivy, which climb into the canopy giving the tree trunks a leafy appearance. The groundlayer is mostly wood nettle with lesser amounts of green-headed sunflower, sawtooth sunflower, cardinal flower, sensitive fern, moneywort, and green dragon. The pileated woodpecker, prothonotary warbler, and tufted titmouse have been seen within the natural area. State Southern Wet Forest State Depositional Feature-Sand Bar Undet.