Horomui Reservoir
| Reservoir Name | Horomui |
| Dam Name | Horomui |
| River | Mappugawa |
| Main Basin | Ishikari |
| Near City | Iwamizawa |
| Administration City | Hokkaido |
| Country | Japan |
| Year | 1990 |
| Dam Height | 44 |
| Dam Length | 437 |
| Area(Sqkm) | 0.5 |
| Area(Polygonal) | 0.5 |
| Capital Expenditure | 8.3 |
| Depth(M) | 16.6 |
| Avg Displacement Of Water | 481 |
| Catchment Area In Sqkm | 17 |
| Main Usage | Irrigation |
| Status | 3: Fair |
| Longitude | 141.93875 |
| Latitude | 43.16625 |
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