The William Haner Polygonal Barn was a historic building located near Pisgah in rural Harrison County, Iowa, United States. It was built in 1912 by Comstock Construction. The 12-sided structure measured in diameter and featured white horizontal siding with a block foundation, a two-pitch roof, and a large hay dormer on the south side. It was originally used as a Purebred Hereford cattle barn. The barn was listed on the National Register of Historic Places in 1986. It was destroyed in a fire caused by lightning in 2002.

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Infrastructure completed in 1912

Polygonal barns in the United States

Barns on the National Register of Historic Places in Iowa

National Register of Historic Places in Harrison County, Iowa

Buildings and structures in Harrison County, Iowa

1912 establishments in Iowa

Buildings and structures demolished in 2002

2002 disestablishments in Iowa

William Haner Polygonal Barn