ðə pˈoːɹʃən ʌv fˈɔːɹmɚ lˈɛdʒɪslətˌɪv ɹˈaʊt fˈɪftiːn fɹʌm mˈʌmfɚd tə skˈɑːtzvɪl ænd ðə sˈɛɡmənt ʌv pɹˈiː nˈaɪntiːnhˈʌndɹɪd twˈɛnti wˈʌn lˈɛdʒɪslətˌɪv ɹˈaʊt fˈɪftiːn ˌɔn mˈeɪn stɹˈiːt ɪn skˈɑːtzvɪl wʌz dˈɛzɪɡnˌeɪɾᵻd æz ðə wˈɛstɚnmˌoʊst pˈoːɹʃən ʌv ˌɛnwˈaɪ tˈuːhˈʌndɹɪd fˈɪfti θɹˈiː, ɐ hˈaɪweɪ ɛkstˈɛndɪŋ fɹʌm mˈʌmfɚd tə hˌɛnɹɪˈɛɾə, æz pˈɑːɹt ʌvðə nˈaɪntiːnhˈʌndɹɪd θˈɜːɾi ɹᵻnˈʌmbɚɹɪŋ ʌv stˈeɪt hˈaɪweɪz ɪn nˈuː jˈɔːɹk.
The portion of former legislative Route 15 from Mumford to Scottsville and the segment of pre-1921 legislative Route 15 on Main Street in Scottsville was designated as the westernmost portion of NY 253, a highway extending from Mumford to Henrietta, as part of the 1930 renumbering of state highways in New York.