| William Haner Polygonal Barn | |
| Location: | County Road L16 |
| Coordinates: | 41.8206°N -95.8236°W |
| Area: | less than one acre |
| Built: | 1912 |
| Architect: | Comstock Construction |
| Added: | June 30, 1986 |
| Refnum: | 86001435 |
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 54feet in diameter and featured white horizontal siding with a block foundation, a two-pitch roof, and a large hay dormer on the south side.[1] It was originally used as a Purebred Hereford cattle barn.[2] The barn was listed on the National Register of Historic Places in 1986. It was destroyed in a fire caused by lightning in 2002.[1]