Superior levels expected to remain high through SeptemberFriday, August 30, 2013 by: SooToday.com Staff
BOARD OF CONTROL
Update on Lake Superior outflow
The International Lake Superior Board of Control, under authority granted to it by the International Joint Commission, has set the Lake Superior outflow to 2770 cubic metres per second (m3/s) for the month of September, effective September 3, 2013.
This amount is 210 m3/s less than the August outflow.
This outflow is as prescribed by Plan 1977-A.
The September outflow will be released by discharging about 2116 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 reduced to four gates fully open on 3 September.
As a result, the flow and water levels in the St Marys Rapids are expected to decrease from those experienced last month, but will still remain relatively high throughout September.
Anglers are therefore advised to continue to be cautious of the unusually high flows and levels in the rapids during September.
There will be no change to the setting of Gate #1 which supplies water to the channel north of the Fishery Remedial Dike, but with four gates fully open in the main rapids, water may overtop the dike along the north side of the rapids.
This past month the water supplies to both the Lake Superior and Lakes Michigan-Huron basins were above average. Currently, the Lake Superior level is about 8 cm below its long-term average beginning-of-September level, and 20 cm above the level recorded a year ago.
It is 25 cm above its chart datum level.
This past month the level of Lake Superior rose 1 cm, which is the average amount the lake rises in August.
The level of Lake Superior is expected to begin its seasonal decline and fall slightly during September.
The level of Lakes Michigan-Huron declined 1 cm this past month, less than the average decline of 4 cm in August.
The level of Lakes Michigan-Huron is 44 cm below its long-term average beginning-of-September level, and is 16 cm higher than it was a year ago.
Lakes Michigan-Huron is 8 cm above its chart datum level.
The level of Lakes Michigan-Huron is expected to continue its seasonal decline during September.
The Board continues to monitor conditions both on Lake Superior and downstream, and will advise the International Joint Commission accordingly on those conditions.
Mr. Jaymie Gadal is the Board Member for Canada. BG Margaret Burcham is the United States Board Member.
For further information please contact Mr. Jacob Bruxer, Canadian Regulation Representative, International Lake Superior Board of Control, Cornwall, Ontario, by phone at (613) 938-5725 or by e-mail at Jacob.Bruxer@ec.gc.ca
Additional information can be found on the Internet at the Board’s homepage