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Horicon Marsh, Mayville

(4.9/5 based on 130+ reviews on the web)
Horicon Marsh is a marsh located in northern Dodge and southern Fond du Lac counties of Wisconsin. It is the site of both a national and a state wildlife refuge. The extinct glacial lake is the largest freshwater cattail marsh in the United States.Geological historyHoricon Marsh was created by the Green Bay lobe of the Wisconsin glaciation during the Pleistocene era. The glacier, during its advance created many drumlins (a type of knoll) in the region, many of which have become the islands of Horicon Marsh. The marsh and surrounding Dodge County have the highest concentration of drumlins in the world.During the glacier's retreat, a moraine was created, forming a natural dam holding back the waters from the melting glacier and forming Glacial Lake Horicon. The Rock River slowly eroded the moraine, and the lake drained. As the levels of silt, clay and peat accumulated in the former lake's basin, the Horicon Marsh was formed.The Horicon Marsh State Wildlife Area is one of nine units of the Ice Age National Scientific Reserve system, being considered to contain unique, representative evidence of the Ice Age of the Pleistocene era.
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Reviews
TripAdvisor
  • We visited in February and did hiking in the marsh. Very peaceful and scenic. We biked in the area in the fall and enjoyed both fall and winter seasons. The bird watching is excellent.  more »
  • Amazing quantities of birds, especially waterfowl, but others as well. Lots of hiking trails, and a nice visitor center. This review is of the south side of the Marsh, which is state-owned. The north ...  more »
  • Largest freshwater cattail marsh in the United States. Boating, hiking and commercial tours. Canoe and kayak rentals for the adventuresome. 200 species of birds pass through or live in the marsh's 32,...  more »