Eiras
| Dam Name | Eiras |
| River | Oitaven |
| Near City | Fornelos |
| Administration City | Pontevedra |
| Country | Spain |
| Year | 1977 |
| Dam Height | 51 |
| Dam Length | 191 |
| Area(Sqkm) | 1.1 |
| Area(Polygonal) | 1.1 |
| Capital Expenditure | 22.2 |
| Depth(M) | 20.2 |
| Avg Displacement Of Water | 3695 |
| Catchment Area In Sqkm | 142 |
| Main Usage | Water supply |
| Status | 2: Good |
| Longitude | -8.487917 |
| Latitude | 42.34875 |
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