International Lake Superior Board of Control

The gate setting of the Compensating Works at the head of the St. Marys Rapids will be maintained at the current setting in September, which is equivalent to approximately five gates fully open. The St. Marys Rapids flow is approximately 773 m3/s. At this flow, some low-lying areas of Whitefish Island including recreational trails may still be flooded. Users are encouraged to use extreme caution.

The gate setting of the Compensating Works at the head of the St. Marys Rapids will be maintained at the current setting in August, which is equivalent to approximately five gates fully open. The St. Marys Rapids flow is approximately 784 m3/s. At this flow, some low-lying areas of Whitefish Island including recreational trails may still be flooded. Users are encouraged to use extreme caution.

On Wednesday, the flow through the St. Marys Rapids will decrease from approximately 1,200 m3/s (42,380 cfs) to 780 m3/s (27,500 cfs). The gate setting will be equivalent to approximately five gates fully open. At this flow, some low-lying areas of Whitefish Island including recreational trails may still be flooded. Users are encouraged to use extreme caution.

The St. Marys Rapids flow will remain at approximately 1,200 m3/s for the month of July. Low-lying areas of Whitefish Island including recreational trails are currently flooded and portions of the Island have been closed by Batchewana First Nation. Users are encouraged to use extreme caution.

Anglers and other users of the St. Marys Rapids, please be advised that the gate setting of the Compensating Works at the head of the St. Marys Rapids will be maintained at the current setting equivalent to approximately eight gates fully open. Low-lying areas of Whitefish Island including recreational trails are currently flooded and portions of the Island have been closed by Batchewana First Nation. Users are encouraged to use extreme caution.

The United States Army Corps of Engineers will be performing an inspection on the gates of the Compensating Works at the head of the St. Marys Rapids on Tuesday, May 23, 2023.

Anglers and other users of the St. Marys Rapids, please be advised that the gate setting of the Compensating Works at the head of the St. Marys Rapids will be increased on Monday May 8, 2023, from the current setting equivalent to approximately five gates fully open to a setting equivalent to approximately eight gates fully open. Low-lying areas of Whitefish Island including recreational trails may flood. Users are encouraged to use extreme caution.

Anglers and other users of the St. Marys Rapids, please be advised that the gates of the Compensating Works at the head of the St. Marys Rapids will be adjusted on Monday April 24, 2023. Gates #6 through #16 will each be raised to a setting of 94 cm (37 in.), which is equivalent to approximately five gates fully open. The Rapids flow will increase from 250 m3/s (8,800 cfs) to 770 m3/s (27,100 cfs). At this flow, some low-lying areas of Whitefish Island including recreational trails may flood. Users are encouraged to use extreme caution.

Anglers and other users of the St. Marys Rapids, please be advised that a higher than customary gate setting continues to be maintained to minimize the impacts of ongoing maintenance at Evolugen’s Clergue hydropower facility in Canada.