From the record
“The Phillip Orth Boathouse is located in Minocqua, Wisconsin, United States. It was added to the National Register of Historic Places in 2005.”
Wikipedia article Phillip Orth Boathouse, CC BY-SA 4.0.
One of 20 National Register listings published here for Oneida County · listed in 2005 · category: Building · built in 1926, American Craftsman.
Sources: the Wikipedia article · the case file at the National Archives · the National Register database, National Park Service