September 2021

Issued 2021.09.15 

The current level of Lake of the Woods is 322.51 m (1058.1 ft), a 5th percentile level for this time of year. The average lake level changed little over the past week and is expected to fall by 1 to 2 cm (1 in) over the next week. 

Lake of the Woods authorized outflow is 100 m3/s and no outflow changes are currently scheduled. Average inflow over the next week is estimated to be approximately 65 m3/s. 

The current level of Lac Seul is 355.57 m (1166.6 ft), a 5th percentile level for this time of year. The average lake level rose by 2 cm (1 in) over the past week and is expected to rise by 2 to 5 cm (1 to 2 in) over the next week. 

Lac Seul authorized outflow is 75 m3/s and no outflow changes are currently scheduled. Average inflow over the next week is estimated to be approximately 150 m3/s.  

On Wednesday September 8, the Board held a Regulation Consultation call to review the current strategy and basin conditions. Based on the discussion, the Board determined that the current strategy adequately addressed the on-going drought conditions and a new strategy would be adopted at the next Regulation meeting, scheduled for the end of October.

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Manitoba Hydro provided the following forecast on September 9 for lake levels along the Winnipeg River in the Whiteshell. For questions related to water levels in this area, please contact Manitoba Hydro. 

* Note: average is based on limited historic data. 

The Winnipeg River receives most of its water from Ontario’s Lake of the Woods and Lac Seul, these flows are regulated by the LWCB. Manitoba Hydro models the expected rise and fall for lakes on the Winnipeg River downstream of Slave Falls Generating Station based on flows set by the LWCB, unregulated tributaries, and expected precipitation. 

Please note: 

  • Operations of Caribou Falls Generating Station in Ontario and local precipitation may cause daily fluctuations in levels. 
  • Manitoba Hydro’s generating stations on the Winnipeg River pass on all the water received from upstream – generally referred to as “run of river”. 
  • This weekly forecast will be provided during the open water season.

Issued 2021.09.01

The current level of Lake of the Woods is 322.51 m (1058.1 ft), a 10th percentile level for this time of year. The average lake level changed little over the past week and is expected to fall by 1 to 3 cm (1 in) over the next week. 

Lake of the Woods authorized outflow will be reduced from 120 to 100 m3/s on Thursday September 2.  The level of the Winnipeg River immediately below the Norman Dam is expected to drop by 3 cm (1 in) in response.  Areas farther downstream will observe a smaller level change.  The level at Minaki will not be affected by this flow change. 

The current level of Lac Seul is 355.55 m (1166.5 ft), a 5th percentile level for this time of year. The average lake level rose by 2 cm (1 in) over the past week and is expected to rise by 1 to 3 cm (1 to 2 in) over the next week. 

Lac Seul authorized outflow is 75 m3/s.