Over the next decade, consolidation of rural school districts in south central Wisconsin hit Tri-County League membership hard, leading to its eventual demise. In 1962, River Valley High School was created from the consolidation of high schools in Spring Green, Arena and Lone Rock.[7] They took the place of Arena and Spring Green in the conference. The next year, two new school districts affecting Tri-County League membership were created: Sauk Prairie (from Prairie du Sac and Sauk City) and Wisconsin Heights (from Black Earth and Mazomanie).[8] The new Sauk Prairie High School joined the South Central Conference in the same year it was created,[9] leaving only six schools in the conference for the 1963-64 school year. Because of the decline in member schools, the Tri-County League merged with the Madison Suburban Conference, with all six schools (Lodi, Poynette, River Valley, Verona, Waunakee, and Wisconsin Heights) comprising the Western Section of the conference.[10]