baɪ nˈaɪntiːnhˈʌndɹɪd θˈɜːɾi sˈɛvən, ðə kəmplˈiːʃən ʌv hˈuːvɚ dˈæm ænd sˈʌbsᵻkwənt kɹiːˈeɪʃən ʌv lˈeɪk mˈiːd kˈɔːzd ðə tˈaʊn ʌv sənt. tˈɑːməs təbi səbmˈɜːdʒd ænd ˈɔːlsoʊ ɹɪzˈʌltᵻd ɪn ˌɛsˈɑːɹ twˈɛlv bˌiːɪŋ sˈɛvɚd ˌɪntʊ tˈuː pˈiːsᵻz baɪ ðə fˈɪlɪŋ lˈeɪk.
By 1937, the completion of Hoover Dam and subsequent creation of Lake Mead caused the town of St. Thomas to be submerged and also resulted in SR 12 being severed into two pieces by the filling lake.