Clinton, Norris Foundation, Palmyra, Williams Bay joined with Northwestern Military & Naval Academy and Wisconsin School for the Deaf to form the Indian Trails Conference, and the remaining four schools (Salem Central, St. Mary's in Burlington, Union Grove and Waterford) formed the Southeastern Badger Conference after unsuccessfully trying to join the Southern Lakes Conference.
[1][2] Membership increased to six in 1965 when Arrowhead (formerly of the Little Ten Conference) and the newly opened Kettle Moraine High School in Wales joined the conference.
[3] Two schools left the Southeastern Badger Conference in 1969: Arrowhead joined the Scenic Moraine Conference and Salem Central joined the Southern Lakes Conference four years after their previous attempt was unsuccessful.
[4] The four remaining schools competed for one more season before disbanding in 1970.
Union Grove and Waterford finally were able to join the Southern Lakes after two failed attempts,[5] Kettle Moraine joined Arrowhead in the Scenic Moraine Conference[6] and St. Mary's competed for one season as an independent before joining the Midwest Prep Conference in 1971.