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Current Regulated Outflows
This page contains an up-to-date listing of current St. Marys River flow as determined by its monthly regulation plan and current St. Lawrence River flow as determined by its weekly regulation plan. Discharge Measurements
This page contains actual field data for hydraulic discharge measurements made on the St. Marys, St. Clair, Detroit, Niagara and St. Lawrence Rivers. These measurements have been made routinely by the United States and Canada since the late 1800s. Historic Connecting Channel Outflows
This page contains monthly average river flows for the St. Marys, St. Clair, Detroit, Niagara and St. Lawrence Rivers. These flow values are derived from equations, models and regulation plans and are coordinated between the United States and Canada. Information is also included for major diversions such as the Long Lac, Ogoki, Chicago, Welland Canal and New York State Barge Canal.
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