hˈaɪweɪ twˈɛlv ɹᵻmˈeɪnd ʌnˈɔltɚd fɔːɹ sˈɛvɹəl dˈɛkeɪdz, ʌntˈɪl ðə mˈɪd nˈaɪntiːnhˈʌndɹɪd sˈɪksti z, wˌɛn ðə bˈiːvɜːtən bˈaɪpæs wʌz kənstɹˈʌktᵻd.
Highway 12 remained unaltered for several decades, until the mid-1960s, when the Beaverton Bypass was constructed.