Formed in 1970 and dissolved in 2015, all conference members belonged to the Wisconsin Interscholastic Athletic Association The Olympian Conference was formed in 1970 by eight small- to medium-sized high schools in proximity to the Fox River Valley and Lake Winnebago in east central Wisconsin.
[4][5] Their stay in the newly-formed EWC was short-lived as they returned to the Olympian[6] in 1980 to bring the circuit back to eight member schools.
The Olympian Conference's membership roster was remarkably stable for the first three decades of its existence, but major changes came in 1999 during a wave of realignment in east central Wisconsin.
[8] Both Manitowoc Lutheran and St. Mary Catholic were new to the WIAA having recently joined as part of the merger with the Wisconsin Independent Schools Athletic Association (WISAA).
The Eastern Wisconsin Conference took four former Olympian schools into the fold (Brillion, Chilton, Roncalli and Valders), and Wrightstown would join the North Eastern Conference.