Happy Valley
| Dam Name | Happy Valley |
| River | Onkaparinga |
| Administration City | South Australia |
| Country | Australia |
| Year | 1896 |
| Dam Height | 24 |
| Dam Length | 806 |
| Area(Sqkm) | 1.5 |
| Area(Polygonal) | 1.5 |
| Capital Expenditure | 14.4 |
| Depth(M) | 9.6 |
| Avg Displacement Of Water | 18 |
| Catchment Area In Sqkm | 18 |
| Main Usage | Water supply |
| Status | 2: Good |
| Longitude | 138.564583 |
| Latitude | -35.075417 |
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