The league also added Sac City, as smaller schools like Twin Rivers and Gilmore City-Bradgate left the conference.
Albert City-Truesdale left the conference in the mid-80s, and the league added Prairie of Gowrie (later merged with Cedar Valley to become Prairie Valley) and Lake City (which later merged with Lohrville and became Southern Cal).
Laurens-Marathon left in 2007 for the Northwest Conference, the same year WLVA and Sac City merged to become East Sac County High School.
Alta–Aurelia, Newell-Fonda, Laurens-Marathon, Sioux Central and Storm Lake St. Mary's joined the conference, which split into two divisions, one maintaining the traditional Northwest conference schools and the other keeping the 6 current Twin Lakes members.
GTRA and West Bend–Mallard became members of the league, leaving their homes in the now-defunct Cornbelt Conference.