• Home on shoreline of Upper St. Lawrence River in Brockville, Ontario, near the end of St  Paul Street. Photo date was May 27, 2019.

    Great Lakes-St. Lawrence River Shoreline High Water Impacts Questionnaire

    Have you been directly impacted by recent high water levels along the Great Lakes and St. Lawrence River shoreline?

  • 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

  • St. Stephen, New Brunswick, Canada. Saint Stephen's Lighthouse resides on the public wharf and above the waters of the St Croix river. The American town of Calais, Maine can be seen.

    Read our latest Water Matters newsletter

    Wrapping up our series on Indigenous Knowledge and sharing news about record-breaking fish counts in the St. Croix River, advancements in sharing water from the St. Mary-Milk rivers and more. 


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.

St. Mary Canal Update

The St. Mary and Milk Rivers, located in Montana and Alberta, are connected by a canal to benefit water users in both countries. On May 17 a concrete drop structure collapsed on the canal stopping flows from the St. Mary from reaching the Milk River. Repair work got underway June 17 and will continue through the summer. The Province of Alberta is posting updates on the situation online.