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Winnipeg River is a Canadian river that flows roughly northwest from Lake of the Woods in the province of Ontario to Lake Winnipeg in Manitoba. This river is 235 kilometres (146 mi) long from the Norman Dam in Kenora to its mouth at Lake Winnipeg.
The reservoir is also used to supplement flows on the Assiniboine when conditions are dry, ensuring water supply for Brandon, Portage la Prairie, irrigators, and some industries. For example in early August, 2021 the flow in Brandon was a little over 9 m 3 /s while the outflow from Shellmouth was 5.7 m 3 /s and inflow was less than 0.5 m 3 /s.
The Fairford River is the only outlet for Lake Manitoba. With the artificially increased flow and limited outflow, Lake St. Martin was turned into a reservoir. The outflow for Lake St. Martin exits through Dauphin River and into Lake Winnipeg, at a lower rate than the water comes in. [1] [2] [3]
Power is transmitted over five 115 kV lines to Winnipeg, and sixth and seventh lines to the Whiteshell and on to Kenora, Ontario. [1] The powerhouse is 128 metres long. The total discharge of water from the station is 1,146 cubic metres per second, with a total drop from forebay to tailrace of 18.6 metres. The station has a 225 metre-long spillway.
Lake Winnipeg watershed Winnipeg River; Red River. Assiniboine River. Qu'Appelle River; Souris River; Saskatchewan River. Lake Winnipegosis watershed; List of rivers
It was also determined that a controlled release of water from the Assiniboine in the range of 2000–6000 cu ft/s should be created downstream of the Portage Diversion in order to reduce flows on the river, and divert the water into the La Salle River watershed, [10] resulting in more manageable river levels along the Assiniboine River. The ...
The flood control system prevented flooding in 1974 and 1979 when water levels neared record levels. However, in the 1997 Red River flood, water threatened the city's relatively unprotected southwest corner. Flood control dikes were reinforced and raised using sandbags and the threat was averted. Winnipeg suffered limited damage compared to ...
This helps prevent flooding on the Assiniboine down river from the diversion, including in Winnipeg, where the Assiniboine River meets the Red River. During flood years such as the 2011 Assiniboine River flood, inlet flows to the Portage Diversion control structure were measured at over 54,000 cu ft/s (1,500 m 3 /s). This amount of water would ...