ɪts wˈɛstɚn tˈɜːmɪnəs ɪz æɾ ˌɪntɚstˈeɪt sˈɪksti nˈaɪn ˈiː slˈæʃ jˈuː.ˈɛs. hˈaɪweɪ sˈɛvənti sˈɛvən slˈæʃ ˈeɪɾi θɹˈiː ænd ˈɛndz æt ðə wˈɛstɚn ˈɛnd ʌvðə kwˈiːn ˌɪseɪbˈɛlə məmˈoːɹɪəl kˈɔːzweɪ æt pˈoːɹt ˈɪzəbˌɛl.
Its western terminus is at Interstate 69E/U.S. Highway 77/83 and ends at the western end of the Queen Isabella Memorial Causeway at Port Isabel.