Hiraoka Reservoir
| Reservoir Name | Hiraoka |
| Dam Name | Hiraoka |
| River | Tenryugawa |
| Country | Japan |
| Year | 1951 |
| Dam Height | 63 |
| Dam Length | 258 |
| Area(Sqkm) | 0.6 |
| Area(Polygonal) | 0.6 |
| Capital Expenditure | 42.4 |
| Depth(M) | 70.7 |
| Avg Displacement Of Water | 121856 |
| Catchment Area In Sqkm | 3614 |
| Status | 3: Fair |
| Longitude | 137.84625 |
| Latitude | 35.282917 |
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