Fourth Lake Fen Forest Preserve

Named for the lake it borders, Fourth Lake Fen features a scenic peninsula with exceptional lake views, three ponds, a large natural wetland, a fen, and an expansive grove of pines and spruces.


About Fourth Lake Fen Forest Preserve

Fourth Lake and its fen ecosystem are home to a variety of state threatened and endangered plant species and could provide habitat for the American bittern and various rails.

Fens are rare, often sloping, wetlands that occur where mineral rich alkaline groundwater comes to the surface. Unlike bogs, fens have higher nutrient and mineral levels and sustain a more diverse plant and animal community. Fens are often covered by grasses, sedges, reeds and wildflowers.

Considered a swale, rather than a kettle ecosystem, the fen is situated between two ridges of the Valparaiso Moraine. The fen drains south into Fourth Lake, which drains eastward via Mill Creek to the Des Plaines River.

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