Update on Lake Superior Outflows and Expected Conditions

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Commission (IJC), has set the Lake Superior outflow to 2400 cubic metres per second (m3/s) for the month of March, effective February 28th. The outflow is being set to the normal maximum winter flow prescribed by Lake Superior Regulation Plan 2012, and may at times vary due to weather events and changes in hydrologic and ice conditions.

The March outflow will be released by discharging about 2308 m3/s through the three hydropower plants and passing most of the remaining flow through the control structure at the head of the St. Marys Rapids. The gate setting of the control structure will be maintained at the equivalent of one-half gate open (four gates open 20 centimetres (cm) each) for the month of March. The one-half gate equivalent setting is the normal winter maximum, and is typically maintained from December through April. There will be no change to Gate #1, which supplies a flow of about 15 m3/s to the channel north of the Fishery Remedial Dike.

The net water supplies to Lake Superior were above average in February. The level of Lake Superior remained stable last month, while on average the lake declines 5 cm in February. The Lake Superior level at the beginning-of-March is 20 cm above average, 4 cm below the level recorded a year ago at this time, and 24 cm above its chart datum level. The level of Lake Superior is expected to continue its seasonal decline in March.

The net water supplies to Lake Michigan-Huron were above average in February. The level of Lake Michigan-Huron rose 4 cm last month, while on average the lake remains stable in February. The level of Lake Michigan-Huron is 25 cm above its long-term average beginning-of-March level, 4 cm lower than it was a year ago, and 52 cm above its chart datum level. The level of Lake Michigan-Huron is expected to begin its seasonal rise in March.

Mr. Jean-François Cantin is the Board Member for Canada. Brigadier General Mark Toy is the U.S. Board Member.

For further information, please contact Mr. Jacob Bruxer, Canadian Regulation Representative, International Lake Superior Board of Control, by phone at (613) 938-5862 or by e-mail at Jacob.Bruxer@canada.ca

Additional information can also be found at the Board’s homepage: http://ijc.org/en_/ilsbc
Or on Facebook at: https://www.facebook.com/InternationalLakeSuperiorBoardOfControl