Gressvatn
| Dam Name | Gressvatn |
| River | Bjerka |
| Near City | Mo i Rana |
| Administration City | Nordland |
| Country | Norway |
| Year | 1969 |
| Dam Height | 23 |
| Dam Length | 560 |
| Area(Sqkm) | 24.1 |
| Area(Polygonal) | 24.1 |
| Capital Expenditure | 227 |
| Depth(M) | 9.4 |
| Avg Displacement Of Water | 5000 |
| Catchment Area In Sqkm | 130 |
| Main Usage | Hydroelectricity |
| Status | 3: Fair |
| Longitude | 14.542917 |
| Latitude | 66.092083 |
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