ðə kˈɜːɹənt ɹˈaʊɾɪŋ ʌv ˌɛsˈeɪtʃ nˈaɪnti wˈʌn wʌz ɚɹˈɪdʒɪnəli bˈɪlt ˌɔn mˈeɪ ˈeɪtiːn, nˈaɪntiːnhˈʌndɹɪd fˈoːɹɾi fˈoːɹ æz stˈeɪt spˈɜː wˈʌnhˈʌndɹɪd fˈɪfti wˈʌn, kənˈɛktɪŋ ðə nˈuːli kəmplˈiːɾᵻd dˈɛnɪsən dˈæm ɐlˈɔŋ ðə ɹˈɛd ɹˈɪvɚ tə ðə sˈɪɾi ʌv dˈɛnɪsən.
The current routing of SH 91 was originally built on May 18, 1944 as State Spur 151, connecting the newly completed Denison Dam along the Red River to the city of Denison.