Anglers cautioned of high flows in St. Mary's RapidsWednesday, October 02, 2013 by: SooToday.com Staff
BOARD OF CONTROL
The International Lake Superior Board of Control, under authority granted to it by the International Joint Commission, has set the Lake Superior outflow to 2,770 cubic meters per second (m3/s) (97.8 thousand cubic feet per second (tcfs)) for the month of October, effective October 3, 2013.
This outflow is as prescribed by Plan 1977-A.
The three hydropower plants will be discharging at full capacity in October.
The expected capacity of the plants in October is 2,148 m3/s (75.9 tcfs). Most of the remaining flow will be passed through the control structure at the head of the St. Marys Rapids.
The gate setting of the control structure will be sustained at four gates fully open for the month of October.
As a result, the flow and water levels in the St. Marys Rapids are expected to remain high.
Anglers are therefore advised to continue to be cautious of the unusually high flows and levels in the rapids during October.
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 Lake Superior were above average, while the same to Lakes Michigan-Huron basins were below average.
Currently, the Lake Superior level is about 6 centimeters (cm) (2 inches) below its long-term average beginning-of-October level, and 32 cm (13 inches) above the level recorded a year ago.
It is 26 cm (10 inches) above its chart datum level. This past month the level of Lake Superior declined 2 cm (1 inch), while on average it declines 1 cm (0.5 inch) in September.
The level of Lake Superior is expected continue its seasonal decline in October.
The level of Lakes Michigan-Huron declined 6 cm (2 inches) this past month, which is average for September.
The level of Lakes Michigan-Huron is 44 cm (17 inches) below its long-term average beginning-of-October level, and is 25 cm (10 inches) higher than it was a year ago.
Lakes Michigan-Huron is 2 cm (1 inch) above its chart datum level.
The level of Lakes Michigan-Huron is expected to continue its seasonal decline during October.
The Board continues to monitor conditions both on Lake Superior and downstream, and will advise the International Joint Commission accordingly on those conditions.
BG Margaret Burcham is the United States Board Member.
Mr. Jaymie Gadal is the Board Member for Canada.