ˌɔn ˈeɪpɹəl ˈeɪtiːn, nˈaɪntiːnhˈʌndɹɪd ˈeɪɾi fˈaɪv, ˌɛsˈeɪtʃ nˈaɪnti wʌz ɹᵻɹˈaʊɾᵻd ˌoʊvɚ spˈɜː wˈʌnhˈʌndɹɪd sˈɛvənti fˈoːɹ tə jˌuːˈɛs sˈɛvənti fˈaɪv, wɪððɪ ˈoʊld ɹˈaʊt nˈɔːɹθ tʊ ˌɛsˈeɪtʃ twˈɛnti wˈʌn slˈæʃ jˌuːˈɛs wˈʌnhˈʌndɹɪd nˈaɪnti bᵻkˈʌmɪŋ pˈɑːɹt ʌv spˈɜː wˈʌnhˈʌndɹɪd sˈɛvənti fˈoːɹ.
On April 18, 1985, SH 90 was rerouted over Spur 174 to US 75, with the old route north to SH 21/US 190 becoming part of Spur 174.