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Posted on: June 4, 2019

Lake Ontario Reaches Record Level

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. 

The amount of additional rise will be driven mainly by how much precipitation falls across the basin, with an additional 2 to 8 cm (0.8 to 3.1 inches) forecast under the most likely scenarios. 

Periods of localized, higher levels are possible during storms and wind events, a number of which have been observed recently.

To better understand impacts, members from the Board and Commissioners from the International Joint Commission have been touring, and will continue to tour the affected areas while conducting listening sessions with elected officials.

Outflows from Lake Ontario continue to be increased as rapidly as conditions allow.  Ottawa River flows have been declining slowly, but remain very high.  The Ottawa River discharges into the St. Lawrence River and combines with the water released from Lake Ontario near Montreal. This is causing high levels in the lower St. Lawrence River, where many areas have been flooded since April. 

The Board, in conjunction with its staff, continues to monitor conditions on an ongoing basis. Information on hydrologic conditions, water levels and outflows, including graphics and photos, are available on the Board’s website and posted to the Board’s Facebook page at https://www.facebook.com/InternationalLakeOntarioStLawrenceRiverBoard

Full text is available online at: https://ijc.org/en/loslrb/lake-ontario-reaches-record-board-continues-respond


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