International Lake Ontario-St. Lawrence River Board

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. 

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.