News Releases

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…

Mild temperatures and minimal ice cover in the St. Lawrence River made it possible to release record amounts of water from Lake Ontario during January and continuing into February, but inflows to Lake Ontario also set records last month.

In an easy-to-read background paper on High Water in 2019, the International Lake Ontario-St. Lawrence River Board responds to the call for more accessible information.

Following the closure of the Seaway, and some partial and temporary ice formation in early January, mild temperatures across the Lake Ontario basin have allowed the International Lake Ontario - St.

Outflows will be increased substantially in the coming days as efforts to remove water from Lake Ontario continue.

Cold weather has caused ice formation to start at critical areas on the St. Lawrence River, requiring Lake Ontario outflows to be temporarily reduced in order to reduce the risk of ice jams.