The Wiouwash Trail is a rail trail in northeastern Wisconsin that traverses the four counties of Outagamie, Shawano, Winnebago, and Waupaca.

The trail’s name is derived from the first two letters of the four counties it traverses and is used by hikers, bikers, walkers, horseback riders during the summer and snowmobilers during the winter months.

The trail spans 41 miles and is divided into two sections, namely the northern segment, which spans 19 miles between the small towns of Birnamwood and Split Rock in Shawano County, and the southern portion, which extends 22 miles from north of downtown Oshkosh to Hortonville.

The trail features endpoints at State Road, in Birnamwood, Split Rock Road, Split Rock, Lakeview Avenue in Hortonville, and River Mill Road, west of the US 45 in Oshkosh.

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