Onzuiko Reservoir
| Reservoir Name | Onzuiko |
| Dam Name | Hikihara |
| River | Hikiharagawa |
| Country | Japan |
| Year | 1957 |
| Dam Height | 66 |
| Dam Length | 184 |
| Area(Sqkm) | 0.7 |
| Area(Polygonal) | 0.7 |
| Capital Expenditure | 21.9 |
| Depth(M) | 31.3 |
| Avg Displacement Of Water | 1255 |
| Catchment Area In Sqkm | 50 |
| Status | 2: Good |
| Longitude | 134.54125 |
| Latitude | 35.232917 |
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