ɪt wʌz ɛkstˈɛndᵻd sˈaʊθwɚd ˌɪntʊ tɹˈævɪs kˈaʊnti ˌɔn mˈeɪ twˈɛnti θɹˈiː, nˈaɪntiːnhˈʌndɹɪd fˈɪfti wˈʌn, tʊ ɐn ˌɪntɚsˈɛkʃən wɪððə fˈɔːɹmɚɹ ˌɛsˈeɪtʃ twˈɛnti pɹˈɛzəntdˈeɪ jˌuːˈɛs tˈuːhˈʌndɹɪd nˈaɪnti ɪn mˈænɚ, ɹᵻplˈeɪsɪŋ ˌɛfˈɛm wˈʌn θˈaʊzənd θɹˈiːhˈʌndɹɪd twˈɛnti sˈɪks.
It was extended southward into Travis County on May 23, 1951, to an intersection with the former  SH 20 (present-day US 290) in Manor, replacing FM 1326.