Additional construction and modifications to the reservoir were carried out through the 1860s and 1870s.
ɐdˈɪʃənəl kənstɹˈʌkʃən ænd mˌɑːdɪfɪkˈeɪʃənz tə ðə ɹˈɛzɚvwˌɑːɹ wɜː kˈæɹid ˈaʊt θɹuː ðə wˈʌn θˈaʊzənd ˈeɪthˈʌndɹɪd sˈɪksti z ænd wˈʌn θˈaʊzənd ˈeɪthˈʌndɹɪd sˈɛvənti z.