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    See the latest issue of Great Lakes Connection

    New members and leaders of our Great Lakes boards are bringing expertise and resources to projects this spring.

  • Drone shot of Moses-Saunders Dam

    Regulation of Lake Ontario and the St. Lawrence River

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

  • Image of lighthouse on Round Island in Lake Michigan

    IJC's 2020 Triennial Assessment of Progress

    The International Joint Commission published the 2020 Second Triennial Assessment of Progress (TAP) Report on Great Lakes Water Quality on December 10, 2020.

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Transboundary Waters

Transboundary Watersheds

Select a watershed (basin) within the map below to learn more about the IJC’s water-related activities.

Lake Ontario and the upper St. Lawrence River Flood Risk Diminishes; Very High Outflows to Continue

The risk of flooding on Lake Ontario and the upper St. Lawrence River has declined from moderate in December 2020 to low. In December, the risk analysis indicated a 28% chance of water levels exceeding a threshold at which damages occur in many shoreline communities. The risk is now down to 8%. There is a comparable risk of flooding on Lake St. Louis in the lower St. Lawrence River.