The flow will increase to approximately 720 cubic meters per second, or 25.4 thousand cubic feet per second
Fishermen and people using St. Mary’s Rapids have been informed that the area will see the highest flow since 2019 after June 6.
The compensatory movements of the gates are scheduled for June 6 and will increase the flow to approximately 720 cubic meters per second, or 25.4 thousand cubic feet per second.
More detailed information about the change is available below in the edition of the International Lake Superior Board of Control.
Fishermen and other users of St. Mary’s Rapids, please be informed of the increased flows and water levels that will be observed in Rapids in June. Following the movements of the Compensating Works gate, scheduled for Monday, June 6, the flow of St. Marys Rapids to be approximately 720 cubic meters per second (m3 / s) (25.4 thousand cubic feet per second (tcfs)), which is the highest flow in Rapids since 2019.
These flows are expected to flood some low-lying areas of Whitefish Island as additional gates open and flows increase. As a result, some leisure and leisure trails in these areas are likely to be flooded and consumers are encouraged to be extremely careful.
The water level of Lake Superior rose significantly in May after another month of significantly wetter than average conditions in the basin. Lake Superior increased by 22 cm (8.7 inches) last month, while the average lake rose by 10 cm (3.9 inches) in May. The water supply was closer to the average in the Lake Michigan-Huron basin. Lake Michigan-Huron rose 8 cm (3.2 inches) last month, the seasonal long-term average for this month. Outflows from Lake Gorno and Lake Michigan-Huron continue to be determined by water levels upstream and downstream.
The board expects total runoff to be 2470 m3 / s (87.2 tcfs) in June, as prescribed by the Superior Lake Regulatory Plan 2012. As a result of this increase in total runoff, combined with ongoing repairs at the Canadian hydropower plant, the adjustment the door in the Compensation Works will be increased to the equivalent of approximately five gates, fully open on Monday, June 6. This will be achieved by lifting gates # 7 to # 12 to a setting of 162 cm (64 inches) open. Gate № 16 will be open at 5 cm (2 inches) to ensure improved efficiency in lamprey capture conducted annually by the US Fish and Wildlife Service. There will be no change in the setting of port №1, which delivers a flow of about 15 m3 / s to the channel north of the diversion.
At the beginning of June, the water level in Lake Gorno Lake was 12 cm (4.7 inches) above the seasonal long-term average (1918-2021) and 2 cm (0.8 inches) above the level of a year ago. At the beginning of June, the level of Lake Michigan-Huron in the whole lake was 27 cm (10.6 inches) above the average, 14 cm (5.5 inches) below the level of a year ago.
Depending on the weather and water conditions next month, Lake Superior could rise by up to 15 cm (5.9 inches) and the water level in Lake Michigan-Huron could rise by up to 12 cm (4.7 inches). inches) in June.
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