| Dyas Hexagonal Barn | |
| Coordinates: | 42.2439°N -90.4175°W |
| Area: | less than one acre |
| Built: | 1921 |
| Added: | June 30, 1986 |
| Refnum: | 86001442 |
The Dyas Hexagonal Barn is a historical building located near Bellevue in rural Jackson County, Iowa, United States. Built in 1921, it is a round barn measuring 50feet around, with red horizontal siding on a stone foundation, a tin roof, and a central wood stave silo extending through the roof. Despite the common name, the building is actually eight-sided, and is also known as the Dyas Octagonal Barn.[1] [2] Originally the roof was flat or almost flat; it is one of four round barns known to have been built on the same farm.[3] It has been listed on the National Register of Historic Places since 1986.