| Soyama Dam | |
| Location Map: | Japan |
| Coordinates: | 36.4724°N 136.9837°W |
| Country: | Japan |
| Location: | Soyama, Toyama Prefecture |
| Purpose: | Power |
| Status: | O |
| Construction Began: | 1927 |
| Opening: | 1930 |
| Dam Type: | Gravity |
| Dam Height: | 73.2m (240.2feet) |
| Dam Length: | 132m (433feet) |
| Dam Volume: | 146000m2 |
| Dam Crosses: | Shō River |
| Spillway Type: | Crest overflow, 12 tainter gates |
| Res Capacity Total: | 33850000m2 |
| Res Capacity Active: | 9205000m2 |
| Res Catchment: | 929.4km2 |
| Res Surface: | 1.42km2 |
| Res Elevation: | 248.3m (814.6feet) |
| Plant Hydraulic Head: | Original: 67.2m (220.5feet) New: 65.7m (215.6feet) |
| Plant Operator: | Kansai Electric Power Co., Inc. |
| Plant Commission: | Original: 5 December 1930 New: 25 February 1967 |
| Plant Turbines: | Original: 3 x 18.7 MW Francis-type New: 1 x 72 MW Francis-type |
| Plant Capacity: | 128.1 MW |
The Soyama Dam is a gravity dam on the Shō River in Soyama village about 13km (08miles) southeast of Nanto in Toyama Prefecture, Japan. It was constructed between 1927 and 1930. The dam has an associated 128.1 MW hydroelectric power station which was built in two parts. The first part of the power station (56.1 MW) was commissioned in 1930 and the second part of the power station (72 MW) was commissioned in 1967. Of the nine dams on the Shō River it is the third furthest downstream.[1]