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Lac des Mille Lacs Dam
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Seine River
Watershed
Raft Lake Dam
Raft Lake Dam
Abitibi Hydro Canada is the owner and operator of
the Raft Lake dam. The dam was built by Steep Rock Iron Mines in 1943,
as part of legal requirement to achieve the diversion. Ontario
Hydro operated the dam from 1980 to 1989, when Abitibi’s then-owner
(Boise Cascade Canada) acquired it. Upper Marmion Lake: The Raft Lake dam controls the water levels and outflows of Upper Marmion Lake (5,525 ha). Unlike the other 2 reservoirs, Upper Marmion Lake makes up a small proportion (1.2%) of its total watershed area (442,575 ha). This means that it takes a relatively short time to replace water removed from the lake, giving a much larger range of potential water level fluctuation relative to Lac des Mille Lacs.
Besides water from the other 2 reservoirs, there is significant inflow to Upper Marmion Lake from uncontrolled sources including the Firesteel River and the Mercutio River. Altogether, uncontrolled inflows account for 56% of the watershed area.
| Reservoir (storage) |
1,500 m3/sec/days |
| Constructed |
1943 |
| # of sluices |
1 slot with 12 logs 3 slots with 20 logs discharge capacity 580 m3/sec maximum 24-hour flow on record (June 3, 1970) is 246 m3/sec |
| Level at top of log with all logs
in |
415.89 metres |
| Level of sill with all logs out |
Sluice 1 is 411.8 metres; sluices 2,3
and 4 are 408.15 metres |
| Constraints |
Discharge control diminishes progressively
as lake level rises above 415.17m; spillwall crest is 415.17m (244m in
length). |
