From the record
“The Island of Happy Days is a historic estate located on Stout Island in Red Cedar Lake, Barron County, Wisconsin. Built from 1909 to 1911, the estate was a summer home for the family of Frank Deming Stout, heir to the Knapp, Stout & Co. fortune.”
Wikipedia article Island of Happy Days, CC BY-SA 4.0.
One of 7 National Register listings published here for Barron County · listed in 1995 · category: District.
Sources: the Wikipedia article · the case file at the National Archives · the National Register database, National Park Service