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French River & Lake Nipissing
Water Level and Flow Information

Interesting Facts

Lake Nipissing

  • When Lake Nipissing is lowered one centimetre over one day, the French River may rise by over 48 centimetres.

  • If watershed soil conditions are very wet, Lake Nipissing may rise four times the amount of rainfall received.

  • During the boating season, the Lake Nipissing water level may fluctuate up to half a meter.

French River

  • During the initial spring melt, inflows into the French River can increase by 100 cubic metres per second within four days in the Dry Pine Bay area, resulting in a water level rise of 60 centimeters on the river.

  • An adjustment of the water levels at the French River dams affects Wolseley Bay in one day, Dry Pine Bay in three to five days, and Hartley Bay in four to eight days, depending on weather conditions.

  • During the boating season, Wolseley Bay water levels may vary  1.85 metres.   Dry Pine Bay levels may vary 2.3 metres. 

  • The Hartley Bay water level is affected by the French River, the Pickerel River and the Wanapitei River.  Water levels may vary as much as four metres during a 12-month period.