Higashikoyako Reservoir
| Reservoir Name | Higashikoyako |
| Dam Name | Nishiarakawa |
| River | Nishiarakawa |
| Country | Japan |
| Year | 1967 |
| Dam Height | 44 |
| Dam Length | 116 |
| Area(Sqkm) | 0.3 |
| Area(Polygonal) | 0.3 |
| Capital Expenditure | 4.3 |
| Depth(M) | 14.3 |
| Avg Displacement Of Water | 630 |
| Catchment Area In Sqkm | 27 |
| Status | 2: Good |
| Longitude | 139.804583 |
| Latitude | 36.819583 |
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