LWCB Logo Lake of the Woods Control Board Notice Board


Issued:  2019.10.10

Normally issued weekly on Thursdays but may be issued more frequently or on other days depending on conditions.
 

 

Flows out of Lac Seul and Lake of the Woods and along the Winnipeg and English Rivers are exceptionally high and will remain so for the remainder of the month.

Potentially dangerous river conditions exist along the Winnipeg River and English River.

Please see Public Information Notice Oct 10 for more information.

The LWCB will be hosting public meetings on the high water conditions on the following dates:

Tuesday, October 15: Holiday Inn South, Winnipeg (Pembina) 7:00:-830 p.m.

Wednesday, October 16: Clarion Lakeside Inn, Kenora 7:00-8:30 p.m.

Board members and staff will provide an update on high water conditions, outlooks to freeze-up and implications for winter and spring, and will take comments and questions.

 


Total rainfall over the past 6 weeks has been remarkably high for this time of year, with 220-255 mm broadly across the Winnipeg and English River watersheds. This has set new records for this period around Lake of the Woods and Winnipeg River in Ontario and Manitoba, and is the second highest on record along the English River and Lac Seul.

The LWCB has rapidly increased outflow from both Lake of the Woods and Lac Seul to in recent weeks in response. Further increases are scheduled for this week with the objective of preventing high lake levels at freeze-up and allowing for more moderate winter flows along these rivers.

The current level of Lake of the Woods is 323.23 m (1060.5 ft), which is greater than 95th percentile level for this time of year and up 5 cm (2 inches) from a week ago.

In response to continued extreme inflow, the LWCB directed the remaining logs at Norman Dam to be pulled on October 10. Outflow is estimated at 1275 m³/s as a result of this operation.

Expected river level rise from this flow adjustment:

Below Norman Dam: 20 cm (8 in)

Above Kimberley Rapids 17 cm (7 in)

Winnipeg River Marina 19 cm (8 in)

Near Locke Bay 18 cm (7 in)

Above Myrtle Rapids 18 cm (7 in)

Above the Dalles 18 cm (7 in)

Above Throat Rapids 18 cm (7 in)

Minaki 13 cm (5 in)

As with recent flow increases, the further downstream from Norman Dam, the longer it will take for the change to develop. The level at Minaki will is expected to take several days to adjust to each flow increase.

With maximized outflow and the substantial precipitation forecast over the long weekend, the level of Lake of the Woods is expected to rise by 9-16 cm (4-6 in) over the next week.

The current level of Lac Seul is 356.52 m (1169.7 ft), a 75th percentile level for this time of year. The average lake level rose by 5 cm (2 in) over the past week and is expected to rise by 5-12 cm (2-5 in) over the next week with the additional precipitation in the forecast.

Lac Seul authorized outflow was increased from 475 to 550 m³/s on Thursday, October 10th.

Over the next couple of weeks, the Winnipeg River level in Manitoba will continue to rise due to the high flows provided by the English and Winnipeg Rivers upstream.

Forecasts provided by Manitoba Hydro on Tuesday, October 8 for river level change over the next 5 days are as follows:

Nutimik Lake: rise of 0.69 m (2.3 ft)

Dorothy Lake: rise of 0.53 m (1.7 ft)

Margaret/ Eleanor Lake: rise of 0.47 m (1.5 ft)

Sylvia Lake: rise of 0.32 m (1.1 ft)
 



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