Lake Ontario & St. Lawrence Flood Warning Downgraded

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Rain over lake Ontario

The Flood Warning for Lake Ontario and the St. Lawrence River – in effect since May 8, 2017 – has now been downgraded to a Flood Watch by the Cataraqui Region Conservation Authority (CRCA).

According to the CRCA, Lake Ontario water levels have dropped approximately 63 cm on average since peaking at the end of May, however levels still remain 43 cm above average.

Local water levels are slightly above that average – Kingston having dropped 67 cm and Brockville dropping 79 cm since their peak. The risk of shoreline flooding and erosion dstill remains during strong wind and high wave conditions as water levels continue to remain above average for this time of year.

The Cataraqui Region Conservation Authority reminds shoreline residents that any work near the water – including placement of fill, armour stone, repairs to docks etc. –  requires a permit from the CRCA. For more information, visit the CRCA website or phone the CRCA at 1-877-956-2722 (toll free in the 613 area code) .


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Caution is also advised in regards to unsafe or unstable banks due to recent erosion as well as floating debris that could cause hazardous conditions for boaters.

For further information on Lake Ontario visit www.ontario.ca/flooding and for up to date flooding information, visit the CRCA’s flood forecasting and information page at www.crca.ca/flood.

The CRCA reports staff will continue to monitor conditions, forecasts, and update statements as needed.


Flood Watch: Flooding is possible in specific watercourse or municipalities. Municipalities, emergency services and individual landowners in flood-prone areas should prepare.

Flood Warning: Flooding is imminent or already occurring in specific watercourses or municipalities. Municipalities and individuals should take action to deal with flood conditions. This may include road closures and evacuations.


Photo (Lake Ontario): Ad Meskens / Wikimedia Commons (cc)