Watershed Update – March 19, 2025
- Generally, snow depth and water content conditions for this time of year are above normal. Water content variances are 101.5% to 126.7% above normal through the entire Upper Mattagami Watershed.
- Current forecasts over the coming week show daytime temperatures ranging from -9°C to +6°C over the next 5 to 7 days. Total snowfall amounts over the next few days could amount to 20 to 40cm, with some precipitation mixed in.
- Inflows across the Upper Mattagami watershed slightly increased since the last report due to rain and above average temperatures. Inflows are currently holding at slightly higher than normal levels but are anticipated to decrease with the return to cooler weather. Reservoirs are currently being drawn down.
- The enclosed portions of Town Creek and Crawford Creek are being closely watched by Authority and Municipal staff.
- The Authority’s Flood Contingency Plan has been distributed to watershed stakeholders.
- The next Update will be issued on or about April 2.
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View OPG River System Data / Water Levels and Flow
If you have any questions or comments, please contact the Conservation Authority at 705-360-2660 or via email at [email protected]
See our Upper Mattagami River Watershed Statistics page to download the current watershed statistics and for the full list of reports for 2025.
The information contained in this update has been gathered by Ontario Power Generation, the Ministry of Natural Resources & Forestry and the Mattagami Region Conservation Authority. The summary highlights dam operations and storages as well as snow depth and water content in comparison to historical norms. Watershed surveys will be conducted on the 1st and 15th of each month until the snow cover has disappeared. Updates will be issued until such time any flood threat has passed.