Lake Helena Reservoir
| Reservoir Name | Lake Helena |
| Dam Name | Lake Helena |
| River | Prickly Pear Creek |
| Administration City | Montana |
| Country | United States |
| Year | 1972 |
| Dam Height | 6 |
| Dam Length | 177 |
| Area(Sqkm) | 7.7 |
| Area(Polygonal) | 7.7 |
| Capital Expenditure | 60.5 |
| Depth(M) | 7.9 |
| Avg Displacement Of Water | 3156 |
| Catchment Area In Sqkm | 1621 |
| Main Usage | Water supply |
| Status | 3: Fair |
| Longitude | -111.907917 |
| Latitude | 46.699583 |
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