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Horicon Marsh, Mayville

#11 of 85 in Wildlife in Wisconsin
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 silted-up glacial lake is the largest freshwater cattail marsh in the United States.
Horicon 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 glacial landform) 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. Occasionally there have even been crop circles that appeared unexpectedly in several areas.
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Horicon Marsh Reviews
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183 reviews
  • We went on a WI DNR field trip. Very informative and interesting. A couple hour walk in the morning and a 2 hour boat ride into the Marsh after the walk.  more »
  • If your into bird watching this is the place to be. We seen over 50 different species this weekend. But there are many more there we did not see.  more »
  • One of Wisconsin's natural gems! I went here recently on a birding expedition and was so impressed with the staff, the landscape, and the opportunities to take it all in on foot and by boat. We saw several bald eagles, blue and green heron, pelicans, swallows,a variety of ducks, beavers, frogs, and more! I plan to come back again next spring.
  • Absolutely AWESOME!! My husband and I go often and I’m amazed at the beauty of it. There are so many different species of birds. Recently, we saw the baby geese with their parents. So adorable. A great place to visit.

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