• osoyoos lake cc

    Read our latest Water Matters newsletter

    Taking another look at the International Watersheds Initiative (IWI) and our transboundary boards. See other articles about youth engagement in the St. Croix River basin, the latest projects and proposals by the Red River Board and more. 

  • 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.

  • A Visual Tour of the System

    The hydrologic features, control structures and varied interests as they relate to outflow regulation in the Lake Ontario-St.Lawrence System


International Watersheds Initiative


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.