International Lake Superior Board of Control

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.

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. The International Lake Superior Board of Control (Board) expects that the total St. Marys River flow will be 2,020 m3/s (71.3 tcfs) in March, which is 390 m3/s (13.8 tcfs) less than the flow prescribed by Regulation Plan 2012.

Anglers and other users of the St. Marys Rapids, please be advised that a higher than customary gate setting will be maintained this winter to minimize the impacts of ongoing maintenance at Evolugen’s Clergue hydropower facility in Canada. The gates of the Compensating Works at the head of the St. Marys Rapids will be maintained at an equivalent of two gates fully open (Gates #6 through #16 partially open 26 cm (10 in) each) in February.

Higher than customary gate setting will be maintained this winter to minimize the impacts of ongoing maintenance at the Canadian hydropower facility. The gates of the Compensating Works at the head of the St. Marys Rapids will be maintained at an equivalent of two gates fully open (Gates #6 through #16 partially open 26 cm (10 in) each) in January. A setting equivalent to one-half gate open (Gates #7 through #10 open 20 cm (8 in) each) is typically used during the winter months.

Anglers and other users of the St. Marys Rapids, please be advised that a higher than customary gate setting will be maintained this winter to minimize the impacts of ongoing maintenance at the Canadian hydropower facility. The gates of the Compensating Works at the head of the St. Marys Rapids have been set to an equivalent of two gates fully open (Gates #6 through #16 partially open 26 cm (10 in) each). A setting equivalent to one-half gate open (Gates #7 through #10 open 20 cm (8 in) each) is typically used during the winter months.

Note: Due to unforeseen scheduling conflicts, the gate adjustments will occur on November 23 and 28. It was previously reported that the initial gate movements would occur today, on November 21, but these adjustments have been postponed to November 23.

Anglers and other users of the St. Marys Rapids are advised that the gate setting of the Compensating Works structure at the head of the Rapids will be adjusted on November 21 and again on November 28, 2022.