I have an answer from the parish office:
The Fond du Lac Area Catholic Education System (FACES) had their first graduating class in 1992. This consolidation included Sacred Heart, St. Joseph, St. Louis, St. Mary,St. Patrick, St. Peter and Presentation in NFDL. In 2002, talk began about a consolidated school system with the grade and high schools. That happened in 2007. In 2009, the school used St. Mary’s Springs Academy as the official school name.
St. Joseph campus is still in use today (2012). Preschool through grade 2 youth are there.
Holy Family came into existence on July 1, 2000, when six parishes (Sacred Heart, St. Joseph, St. Louis, St. Mary, St. Patrick and St. Peter) merged. St. Louis was sold, and during the remodeling process the church burned down. St. Patrick was sold to a private party, and they use the church for concerts; the school is rented out.
St. Joseph Church is currently (2012) for sale. St. Mary's Springs Academy uses the schools at St. Joseph, St. Mary's, and St. Mary's Springs High School campuses to teach children of the parishes. St. Joseph Church is currently used by the school for Mass and prayer services.