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Posted on: June 6, 2019

Lake Ontario Reaching Peak, Outflows Increased Rapidly

Press Release from The International Lake Ontario – St. Lawrence River Board

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. 

Outflows reached 10,000 m3/s (353,100 cfs) yesterday, close to the highest on record, and further increases are expected. 

Extraordinarily high outflows combined with forecasts of warmer, drier conditions later this week, make it likely that Lake Ontario is at or very near its peak level this year.  Any additional rise is likely to be small, less than 3 cm (1 in.) depending on rainfall, and there is a good chance levels will remain stable or even start to decline slowly next week.

With levels above average their remains the possibility for locally higher levels, especially during periods of active weather, and the Board reminds everyone to refer to local forecasts for conditions and warnings specific to your area. 

The Board continues to monitor the situation, makes use of every opportunity to increase outflows, and consider all possible measures to provide relief from the record-high water levels. 

View Full Press Release Here
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