From the record
“The Ben and Margaret Stone Boathouse is a historic boathouse in Plum Lake, Wisconsin. The boathouse was built in 1928 by Ben and Margaret Stone of Tripoli, Wisconsin.”
Wikipedia article Ben and Margaret Stone Boathouse, CC BY-SA 4.0.
One of 15 National Register listings published here for Vilas County · listed in 2008 · category: Building · built in 1928, American Craftsman.
Sources: the Wikipedia article · the case file at the National Archives · the National Register database, National Park Service