The Seine River Diversion is a river diversion in Rainy River District in northwestern Ontario, Canada located near Atikokan. It was built to divert water around open-pit hematite iron ore mining at Steep Rock Lake beginning in 1943 (1943).
The Seine River near the town of Atikokan originally flowed into Steep Rock Lake from Moose Lake over Moose Falls on the Steep Rock Moraine, where a hydroelectric generating station was built in 1926. The building of the dam created the Marmion Lake reservoir, which then acted as the main method for regulating water flow to the Moose generating station, and to the Calm and Sturgeon Falls generating stations further downstream built at the same time.
In 1943, the Seine River Diversion was undertaken to enable the open pit mining of a high-grade body of iron ore under the middle arm of Steep Rock Lake by Inland Steel Company and its subsidiary Caland Ore Canada. The diversion had several elements:
In 1952, several additions were undertaken:
There is one named tributary on the diversion: Hardtack Creek enters Finlayson Lake as a right tributary of the Seine River.
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