The Reservoir was built in 1920. At that time, the Japanese used the natural valley of Kuan Tien Hsi for building a dam near Wushantou to impound water for the irrigation of the farmland of the Chianan plain.
水庫興建於民國九年，當時日本人利用官田溪的自然溪谷，在烏山頭附近築壩截流，以供嘉南平原的灌溉用水。