From the record
“Iris was a schooner launched at Port Huron, Michigan, in 1866. She spent 47 years sailing the Great Lakes; for most of this time she was based out of Detroit Harbor, Wisconsin.”
Wikipedia article Iris (1866 ship), CC BY-SA 4.0.
One of 68 National Register listings published here for Door County · listed in 2006 · category: Site.
Sources: the Wikipedia article · the case file at the National Archives · the National Register database, National Park Service