ˌɔn sɛptˈɛmbɚ twˈɛnti ˈeɪt, nˈaɪntiːnhˈʌndɹɪd fˈɪfti, ðə sˈɛkʃən fɹʌm dˈɛl ɹˈiːoʊ tə kæɹˈɪzoʊ spɹˈɪŋz wʌz tɹænsfˈɜːd tə nˈuːli ɛkstˈɛndᵻd jˈuː.ˈɛs. hˈaɪweɪ tˈuːhˈʌndɹɪd sˈɛvənti sˈɛvən.
On September 28, 1950, the section from Del Rio to Carrizo Springs was transferred to newly extended U.S. Highway 277.