From the record
“The Bonnie Oaks Historic District is located in Briggsville, Wisconsin in the Town of Douglas. The district was added to the National Register of Historic Places on April 3, 1986.”
Wikipedia article Bonnie Oaks Historic District, CC BY-SA 4.0.
One of 7 National Register listings published here for Marquette County · listed in 1986 · category: District.
Sources: the Wikipedia article · the case file at the National Archives · the National Register database, National Park Service