ðə lˈeɪk wʌz kɹiːˈeɪɾᵻd bᵻtwˌiːn nˈaɪntiːnhˈʌndɹɪd twˈɛnti fˈoːɹ ænd nˈaɪntiːnhˈʌndɹɪd twˈɛnti ˈeɪt baɪ bˈɪldɪŋ fˈoːɹ dˈæmz ɪn ˈɔːɹdɚ tə səplˈaɪ wˈɔːɾɚ fɔːɹ mˈiːntɹɑːɡ pˈaʊɚ stˈeɪʃən.
The lake was created between 1924 and 1928 by building four dams in order to supply water for Maentwrog power station.