Lake Ontario levels peaked early this year at 75.40 m (247.38 ft.) on 5 May, 10 cm (4 inches) below the general flood stage and over a half meter (20 inches) lower than the peak in 2019. Lake levels are expected to continue their seasonal decline through summer, and have fallen 6 cm (2 in.) from…
News Releases
Thanks to favorable weather and water supply conditions, in conjunction with recent actions taken by the International Lake Ontario-St. Lawrence River Board to increase Lake Ontario outflows, the board no longer needs to limit outflows to alleviate flooding risks downstream.
Water levels throughout the Lake Ontario – St. Lawrence River system in 2020 are expected to peak well below the record-highs of 2017 and 2019, according to the latest projections from the International Lake Ontario-St. Lawrence River Board.
Water levels remain high across the Great Lakes basin. The four upper Great Lakes are near- or above record-high levels, while Lake Ontario is still well above average, but also well below record levels. Lake Ontario is now likely to remain below record-highs through the spring.
The first major spring storm pushed through the Great Lakes – St. Lawrence River basin this past weekend, bringing high winds and precipitation, raising inflows and accelerating the seasonal rise in water levels.
Spring is a critical period for Lake Ontario outflow regulation, as the International Lake Ontario - St. Lawrence River Board is closely coordinating with the Ottawa River Regulation Planning Board during the Ottawa River snowmelt (freshet), to have the highest outflow from Lake Ontario while…
Due to favorable ice conditions and previously implemented deviation strategies, the Lake Ontario outflows surpassed the historical record-high for the month of March, making this the third straight monthly record that has been exceeded during the Board’s ongoing efforts to deviate from Plan 2014…
The International Lake Ontario–St. Lawrence River Board agreed March 11th to amend its Plan 2014 temporary deviation strategies to allow for additional increases to the rate of water removed from Lake Ontario through the spring.
The International Lake Ontario–St. Lawrence River Board agreed on February 21 to continue deviating from Plan 2014 and maximize outflows through the spring.
Lake Ontario is again near record highs for this time of year and the risk of high levels this spring remains elevated. While considerable uncertainty in projections for spring still exists, the International Lake Ontario–St. Lawrence River Board is providing advanced notice so communities can…