Plagmann Round Barn

{{Use mdy dates|date=March 2025}}

{{Infobox NRHP

| name = Plagmann Round Barn

| nrhp_type =

| image = Plagmann Round Barn, Conroy, Iowa.jpg

| caption = Plagmann Round Barn

| location = County Road V66

| nearest_city = Conroy, Iowa

| coordinates = {{coord|41|43|30.5|N|92|3|23.9|W|display=inline,title}}

| locmapin = Iowa#USA

| area = less than one acre

| built = 1912

| builder = Charles & Richard Plagmann

| architect =

| architecture =

| added = June 30, 1986

| mpsub = {{NRHP url|id=64000152|title=Iowa Round Barns: The Sixty Year Experiment TR}}

| refnum = 86001440{{NRISref|2009a}}

}}

The Plagmann Round Barn is an historic building located near Conroy in rural Iowa County, Iowa, United States. It was built in 1912 as a cattle barn by Charles and Richard Plagmann. The building is a true round barn that measures {{convert|100|ft|m}} in diameter.{{cite web|url=http://www.dalejtravis.com/rblist/rbia.htm|title=Iowa Round Barn List|publisher=Round Barns & Covered Bridges|accessdate=2011-01-13|author=Dale Travis}} It is one of the largest Iowa Agriculture Experimental Station/Matt King type barns in the state.{{cite web|url={{NRHP url|id=86001440}}|title=Plagmann Round Barn|publisher=National Park Service|accessdate=2017-11-19|author=}} with {{NRHP url|id=86001440|photos=y|title=photo}} It is three floored — at the bottom is the feeding floor, at the middle is the stalls and at the top is the haymow. The barn is constructed of terracotta clay tile and features an aerator, a two-pitch roof and a 16-foot (4.9 m) central silo.{{cite web |title=Unconventional shapes |url=https://www.thegazette.com/history/unconventional-shapes/ |website=www.thegazette.com |access-date=27 August 2021}}{{cite web |title=Plagmann True-Round Barn |url=https://sah-archipedia.org/buildings/IA-01-CE334 |website=SAH ARCHIPEDIA |access-date=27 August 2021 |language=en |date=16 July 2018}} It has been listed on the National Register of Historic Places since 1986.