Despite a new rather large school to house 7th and 8th graders, and more room in the high school, the township was exploding in population at the time, and both WTHS and WTMS were overcrowded only a few years after the middle school opened. In the mid-1980s, planning for yet another new middle school was underway. This time, however, because WT's elementary schools also faced overcrowding, the school district went ahead and built two schools, which would enroll grades 6 through 8, thus relieving all the elementary schools in the district from 6th graders (they also were relieved of all kindergarteners, thanks to an addition at Grenloch Terrace Early Childhood Center). In fall of 1989, Chestnut Ridge Middle School and Orchard Valley Middle School opened for grades 6-8. The former WTMS became part of the high school complex, renamed as the 9/10 Building (as it served mostly students in 9th and 10th grade), while the original HS was also renamed as the 11/12 Building.