News Releases

The Board is doing everything possible to provide all possible relief to Lake Ontario and upper St. Lawrence River residents, while considering impacts throughout the system.

LAKE ONTARIO OUTFLOWS TO BE MAINTAINED ABOVE NAVIGATION LIMIT - The Board is actively exploring deviating beyond an outflow of 10,400 m3/s (367,270 cfs) reached on June 13th, with the intent to provide relief to shoreline stakeholders upstream of the Moses-Saunders Power Dam.
LAKE ONTARIO OUTFLOWS TO BE INCREASED ABOVE NAVIGATION LIMIT - The International Lake Ontario – St. Lawrence River Board (Board) will continue to increase outflows to provide relief to shoreline interests on Lake Ontario after it agreed to raise flows above the regulation plan’s maximum L-Limit,…
LAKE ONTARIO REACHING PEAK, OUTFLOWS INCREASED RAPIDLY - Lake Ontario water levels have started to stabilize due to decreased precipitation and increased Lake Ontario outflows, which have been increasing rapidly as Ottawa River flows have continued to drop from their record highs this spring.
LAKE ONTARIO REACHES RECORD, BOARD CONTINUES TO RESPOND - Lake Ontario has reached 75.90 m (249.02 ft), exceeding the record peak of 75.88 m (248.95 ft) set in 2017, and will continue rising gradually over the next several days, but is expected to reach this year’s peak within one to three weeks.

Lake Ontario water levels have reached 75.85 m (248.85 ft) and will likely reach or exceed the 2017 record high of 75.88 m (248.95 ft) with the next few days.  Forecasts show that Lake Ontario levels are expected to crest within the next one to three weeks, mostly likely within a few centimeters…

Outflows from Lake Ontario have increased once again after they were temporarily reduced after heavy rainfall a week ago caused a second peak in Ottawa River flows, which led to an increase in St. Lawrence River water levels and additional flooding on the St. Lawrence River near Montreal. 

LAKE ONTARIO OUTFLOWS CONTINUE TO BE ADJUSTED TO BALANCE HIGH WATER LEVELS - With Lake Ontario caught between a flooding Lake Erie and a flooded lower St. Lawrence River, outflows from Lake Ontario continue to be frequently adjusted to balance the impacts of high water levels that are occurring…

A major flood event is under way in the lower St. Lawrence River with levels in some areas above 2017 peaks, while levels throughout the Lake Ontario - St. Lawrence River system are expected to keep rising significantly this coming week due to rainfall across the basin. 

HIGH LAKE ONTARIO OUTFLOWS CONTINUE - The outflow from Lake Ontario remains very high and it continues to be gradually increased in response to rising Lake Ontario levels and persistently high inflows from Lake Erie.