Horicon Marsh, 3 mi. e. on SR 49, occupies 33,000 acres of wetlands and uplands. During the annual spring and fall migrations, thousands of ducks, geese and sandhill cranes can be seen at a time along with many other bird species who use the marsh as a stopover. Mallards, redheads, ruddy ducks and blue-wing teals nest during the summer; egrets, herons, muskrats and deer also are common. Observation areas off SR 49 and Rockvale Road provide optimal viewing.
A self-guiding auto tour winds through 3.2 miles of the national refuge; three hiking trails and a floating boardwalk are accessible from the route. Maps are available at the refuge visitor center, W4279 Headquarters Rd. in Mayville.
The 34-mile Wild Goose State Trail runs from Fond du Lac to SR 60 south of Juneau, bordering the west side of Horicon Marsh. The Horicon Marsh Parkway makes a 30-mile loop of the entire Horicon Marsh and offers numerous overlooks; follow the signs from Horicon.
The northern 22,000 acres of the marsh, accessible from SR 49, are a national wildlife refuge; the southern third, accessible from SR 28 at Horicon, is state-owned.
Hiking trails and public use areas open daily dawn to dusk. Visitor center open Mon.-Sat. 9-4, Apr.-Nov. (also Sun. 9-4 in Oct.); Mon.-Fri. 9-4, rest of year. Closed Jan. 1, Memorial Day, Thanksgiving, Christmas Eve and Christmas.