St. Jean Reservoir
| Reservoir Name | St. Jean |
| Dam Name | Isle Maligne Spillway 1 |
| River | Grande Decharge |
| Near City | Alma |
| Administration City | Quebec |
| Country | Canada |
| Year | 1925 |
| Dam Height | 45 |
| Dam Length | 216 |
| Area(Sqkm) | 1066.5 |
| Area(Polygonal) | 1066.5 |
| Capital Expenditure | 5370 |
| Depth(M) | 5 |
| Avg Displacement Of Water | 1399629 |
| Catchment Area In Sqkm | 72559 |
| Main Usage | Hydroelectricity |
| Multi Dams,C,10 | Yes |
| Status | 3: Fair |
| Longitude | -71.63625 |
| Latitude | 48.57875 |
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