Wushantou Dam is an embankment dam in Guantian District, Tainan, Taiwan. The dam was designed by Yoichi Hatta and built between 1920 and 1930 during Japanese rule to provide irrigation water for the Chianan Plain as part of the Chianan Irrigation system. Because the natural flow of the Guantian River and other local streams was insufficient for irrigation of a planned 100,000 ha, a tunnel was constructed to divert water from the Zengwun River to fill the reservoir. In 1974, the Zengwun Dam was completed on the Zengwun River shortly above the diversion tunnel, stabilizing and reducing the sediment load of water flowing into Wushantou Reservoir.
The dam consists of a curved embankment 50.5 m high and 1,273 m long, containing 5,400,000 m3 of material. The reservoir comprises 9 km2 and was designed to store 154,160 dam3 of water.
Coordinates 23°12'11.638" N 120°23'19.578" E