Regulation of Lake Ontario and the St. Lawrence River

Learn more about the roles and responsibilities of the key players in the regulation of Lake Ontario and the St. Lawrence River.

Learn more
Regulation of Lake Ontario and the St. Lawrence River

Learn more about the roles and responsibilities of the key players in the regulation of Lake Ontario and the St. Lawrence River.

Learn more

International Lake Ontario-St. Lawrence River Board

The International Lake Ontario-St. Lawrence River Board ensures that outflows from Lake Ontario meet the requirements of the International Joint Commission's Orders of Approval. The Board also has responsibilities to communicate with the public.

About the Board

Latest News Releases

September 25, 2025

The International Lake Ontario-St. Lawrence River Board plans to increase Lake Ontario outflows by up to 500 cubic meters per second (17,700 cubic feet per second) to temporarily raise the water level of Lake St. Louis on October 18. This temporary increase in Lake St. Louis water levels is intended...

August 21, 2025

The International Lake Ontario-St. Lawrence River Board is providing this notice to summarize current water level conditions.

February 25, 2025

Water levels in each of the Great Lakes, except for Lake Erie, are currently below long-term monthly averages. Actual spring and summer water levels will depend primarily on weather and water supplies during the spring and summer months.

October 25, 2024

The International Lake Ontario-St. Lawrence River Board is providing this notice to summarize the water level conditions from September 2024 through the remainder of Autumn.

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