The Yongheshan Reservoir () is a reservoir in Sanwan Township, Miaoli County, Taiwan.
The construction of the dam began in July 1980 and finished in October 1984.
The water level of the reservoir stands at a height of . The reservoir features automatic overflow side spillway. The reservoir has an effective capacity of 28,096,000 m<sup>3</sup>.
The reservoir supplies water to public sectors for about 187,000 m<sup>3</sup> per day.