The Yongheshan Reservoir (traditional Chinese: 永和山水庫; simplified Chinese: 永和山水库; pinyin: Yǒnghéshān Shuǐkù) is a reservoir in Sanwan Township, Miaoli County, Taiwan.

The dam was constructed starting in July 1980 and completed in October 1984.

[1] The water level of the reservoir stands at a height of 89.5 meters.

The reservoir features automatic overflow side spillway.

[2] The reservoir supplies water to public sectors for about 187,000 m3 per day.