Skip to content

May 2024

2024.05.23 Conditions Update and Levels Forecast

Although the basin received high rainfall over the last few days, so far inflows have been manageable and lake level are rising within their normal ranges.  Most of the basin received 50 to 60 mm on Tuesday evening and Wednesday.  This resulted in very rapidly increasing flows in the tributaries and a sudden jump in lake levels (8 cm at Lac Seul and 5 cm at Lake of the Woods).  Forecasts are predicting a chance for some moderate rainfall this Friday and Saturday, followed by much drier conditions next week.  This means high tributary flows and lake inflows will be temporary.

The current level of Lake of the Woods is 322.74 m (1058.86 ft), a 40th percentile level, within the normal range for this time of year. The average lake level increased by 7 cm (3 in) over the last week and is expected to increase by 5 to 12 cm (2 to 5 in) over the next week, depending on precipitation amounts and upstream flow changes. Lake of the Woods authorized outflow is 400 m3/s with planned outflow increases to 480 m3/s tomorrow May 24th and 550 m3/s Monday May 27th. More outflow increases may be required depending on the amount of the rainfall over the next week.  

These flow changes will cause a large and rapid increase in levels along the Winnipeg River. By Tuesday, water levels will have increased by approximately 35 cm, (14 in) directly downstream of the Norman Dam and by 20 cm (8 in) above the Dalles. The level at Minaki will not be affected by these flow changes, but could increase due to local inflow.

The current level of Lac Seul is 355.25 m (1165.5 ft), a 40th percentile level, within the normal range for this time of year. The average lake level increased by 14 cm (5.5 in) over the past week and is expected to increase by 17 to 22 cm (6.5 to 8.5 in) over the next week. Lac Seul authorized outflow is 200 m3/s with a planned increase to 240 m3/s Friday May 24th.

If you have any questions, comments or observations, please contact the Secretariat at secretariat@lwcb.ca or by calling 1-800-661-5922. This Noticeboard will be updated regularly as conditions develop.

For more information on Namakan and Rainy Lakes, visit the Water Level Notices page of the International Rainy-Lake of the Woods Watershed Board.

2024.05.21 High Rainfall Event

Conditions in the Winnipeg River basin are beginning to change quickly. The basin has received larger amounts of precipitation over the past week and over the weekend. Most of the basin received a 7-day total of 25 mm with some areas totaling up to 40 mm.

A low pressure system is forecast to impact the Winnipeg River basin starting this evening, bringing heavy rainfall over the next couple of days. Environment Canada has issued a Rainfall Warning covering the entire basin. This system could bring up to 80 mm (3 in) of rainfall tonight through tomorrow. Forecasts indicate weekly totals could exceed 150 mm (6 in).

This large amount of rainfall will cause flows in tributaries and inflows to the major lakes to rise quickly. Although outflow increases are being made in advance of the upcoming precipitation at Namakan Lake, Rainy Lake and Lake of the Woods, outflows are lower than the expected inflows. Therefore, lake levels will rise and additional, larger outflow increases will be required at Lake of the Woods and may be required at Lac Seul. These outflow increase will be made in consideration of downstream impacts, but levels along the English and Winnipeg Rivers are expected to rise considerably over the next week. 

The current level of Lake of the Woods is 322.72 m (1058.79 ft), a 40th percentile level, within the normal range for this time of year. The average lake level increased by 6 cm (2.5 in) over the last week and is expected to increase by 15 to 35 cm (6 to 14 in) over the next week, depending on precipitation amounts. Lake of the Woods authorized outflow is 200 m3/s with planned outflow increases to 225 m3/s today May 21st, 300 m3/s Wednesday May 22nd, and 400 m3/s Thursday May 23rd. More outflow increases may be required depending on the severity of the rainfall over the next couple of days.  

Flow changes this week will cause a large and rapid increase in levels along the Winnipeg River. By Friday, water levels will have increased by approximately 40 cm, (16 in) directly downstream of the Norman Dam and by 16 cm (6 in) above the Dalles. The level at Minaki will not be affected by these flow changes, but could increase due to local inflow.

The current level of Lac Seul is 355.2 m (1165.4 ft), a 40th percentile level, within the normal range for this time of year. The average lake level increased by 13 cm (5 in) over the past week and is expected to increase by 30 to 46 cm (12 to 18 in) over the next week. Lac Seul authorized outflow is 150 m3/s with a planned increase to 200 m3/s Wednesday May 22nd.

If you have any questions, comments or observations, please contact the Secretariat at secretariat@lwcb.ca or by calling 1-800-661-5922. This Noticeboard will be updated regularly as conditions develop.

For more information on Namakan and Rainy Lakes, visit the Water Level Notices page of the International Rainy-Lake of the Woods Watershed Board.

2024.05.16 Conditions Update and Levels Forecast

Spring conditions in the Winnipeg River basin have so far been favourable, with an early freshet followed by moderate amounts of rainfall. Water levels on both Lake of the Woods and Lac Seul have been rising steadily within the normal range. Some Regulation Strategy targets that have been, or are on track to be achieved include the May 15th preferred water level of 355.1 m on Lac Seul for fisheries, and the end-of-May water level target of 322.7 m (1058.7 ft) for Lake of the Woods under moderate inflow conditions. Flows on the English and Winnipeg Rivers are also slowly rising with steady precipitation and small outflow increases from Lake of the Woods.

The current level of Lake of the Woods is 322.67 m (1058.61 ft), a 40th percentile level, within the normal range for this time of year. The average lake level increased by 5 cm (2 in) over the last week and is expected to increase by 2 to 5 cm (1 to 2 in) over the next week, depending on precipitation amounts. Lake of the Woods authorized outflow is 200 m3/s with no changes scheduled at this time.

The current level of Lac Seul is 355.10 m (1165.0 ft), a 40th percentile level, within the normal range for this time of year. The average lake level increased by 10 cm (4 in) over the past week and is expected to increase by 8 to 12 cm (3 to 5 in) over the next week. Lac Seul authorized outflow is 150 m3/s with no changes scheduled.


The LWCB Basin Data page will not be updated on Monday, May 20th (Victoria Day in Canada). Daily data updates and publication will resume on Tuesday, May 21st.

2024.05.09 Levels Forecast and Lake of the Woods Outflow Increases

The current level of Lake of the Woods is 322.62 m (1058.45 ft), a 40th percentile level, within the normal range for this time of year. The average lake level increased by 10 cm (3 in) over the last week and is expected to increase by 1 to 4 cm (1 to 2 in) over the next week. Lake of the Woods authorized outflow was increased to 175 m3/s today, May 9th, and is scheduled to increase to 200 m3/s on Monday, May 13th.

Each of these flow changes will cause the level of the Winnipeg River to increase by approximately 4 cm (2 in) directly downstream of the Norman Dam and by 1 cm (0.5 in) above the Dalles. The level at Minaki will not be affected by these flow changes.

The current level of Lac Seul is 355.00 m (1164.70 ft), a 40th percentile level, within the normal range for this time of year. The lake level increased by 14 cm (5 in) over the past week and is expected to increase by 5 to 8 cm (2 to 3 in) over the next week. Lac Seul authorized outflow is 150 m3/s with no changes scheduled.

We want to hear from you!

The Lake of the Woods Control Board is planning a website redevelopment and would like your feedback. Please take some time to complete our Website Survey. Your input is important to help us design a website that serves your needs. Thank you!

If you have any questions about the survey or need assistance, please contact the Secretariat at secretariat@lwcb.ca or by calling 1-800-661-5922.

2024.05.03 Conditions Update and Levels Forecast

With the precipitation observed early in the week, tributaries in the southern part of the basin have started rising. Inflows to the major lakes are also increasing as a result. There is some rain forecast across the basin over the next few days before the forecast becomes dryer and inflows could potentially decrease.

The current level of Lake of the Woods is 322.54 m (1058.20 ft), a 35th percentile level, within the normal range for this time of year. The average lake level increased by 5 cm (2 in) over the last week and is expected to increase 3 to 5 cm (1.2 to 2 in) over the next week, depending on precipitation amounts. Lake of the Woods authorized outflow is 150 m3/s with no changes scheduled.

The current level of Lac Seul is 354.88 m (1164.30 ft), a 35th percentile level, within the normal range for this time of year. Lake inflows and levels continue to increase. The lake level increased by 13 cm (5 in) over the past week and is expected to increase by 7 to 11 cm (2.8 to 4.3 in). Lac Seul authorized outflow is 150 m3/s with no changes currently scheduled.