ɪn nˈaɪntiːnhˈʌndɹɪd sˈɪksti sˈɪks ðə bˈɪldɪŋ bɪkˌeɪm tˈuː smˈɔːl wɪð ɐpɹˈɑːksɪmətli wˈʌn,fˈaɪvhˈʌndɹɪd stˈuːdənts, ænd ðə skˈuːl splˈɪt ˌɪntʊ tˈuː skˈuːlz, pˈoːɹɾɪdʒ sˈɛntɹəl hˈaɪ skˈuːl ænd pˈoːɹɾɪdʒ nˈɔːɹðɚn hˈaɪ skˈuːl.
In 1966 the building became too small with approximately 1,500 students, and the school split into two schools, Portage Central High School and Portage Northern High School.