Walk south 0.25 mile to the fen. A state-threatened plant species occurs on the site. Waterloo Fen and Springs includes a raised fen, a moist meadow, and wet seepage slopes. The hummocky, black peat soil of the fen supports big bluestem, bluejoint, Indian grass, shooting star, prairie blazing star, grass of parnassus, lousewort, common bog arrowgrass, valerian, golden alexanders, pale-spiked lobelia, Riddell's goldenrod, mountain mint, and several asters. Along the west edge of the raised fen are numerous springs and spring runs flowing into Stony Creek.
Water parsnip grows in the springs.
Common nesting birds include willow flycatcher, yellow warbler, marsh wren, sedge wren, swamp sparrow, and sandhill crane. Land Control - DNR, Wildlife Management. Manager - Wildlife Manager, Courthouse, Jefferson, WI 53549. Prescribed burns and brushing are conducted to maintain fen vigor and integrity. The fen is undisturbed, but the surrounding sedge meadow has been invaded by canary grass and nettle.