Lake Diefenbaker Updates
Lake Diefenbaker Updates
Updated October 15, 2026
Current Conditions
- Flows in the Oldman River Basin are generally near lower quartile levels for this time of year.
- Flows in the Bow River Basin are generally between median and lower quartile levels, while flows in the Red Deer River Basin are near lower decile levels for this time of year.
- Inflows into Lake Diefenbaker are currently near the seasonal median. Inflows are forecast to gradually decline over the next 10 days while remaining within the historical interquartile range.
- Lake Diefenbaker water levels are currently between the lower quartile and median levels for this time of year and remain within the historical interquartile range.
- Conditions will continue to be monitored closely, and outflows may be adjusted as needed based on updated forecasts and observed basin conditions.
Forecast Overview
The table below shows the updated 10-day forecast for Lake Diefenbaker.
- Inflows into Lake Diefenbaker are expected to gradually decline from approximately 170 m³/s to 120 m³/s over the forecast period.
- Daily mean outflows are expected to remain steady at approximately 130 m³/s throughout the forecast period.
- Lake Diefenbaker levels are expected to increase slightly from approximately 555.50 m to 555.52 m, before remaining relatively stable for the remainder of the forecast period.
Note: Flows shown in the table above are mean (average) daily flows. Actual releases from Lake Diefenbaker may fluctuate throughout the day as SaskPower adjusts operations at Coteau Creek Hydro Station to meet the Province’s electricity demands.
Hydrologic / Weather Conditions
- No significant precipitation was received across the South Saskatchewan River Basin this week.
- No significant precipitation is forecast for the headwaters over the weekend.
Below are the updated plots showing 2026 observed inflows and reservoir elevations compared to historical ranges.
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