Lake Diefenbaker Updates
Lake Diefenbaker Updates
Updated September 25, 2026
Current Conditions
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Flows in the Oldman River Basin are currently above upper quartile levels but are generally receding.
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Flows in the Bow River Basin are generally between median and upper quartile levels and are receding, while flows in the Red Deer River Basin are generally between lower quartile and median levels.
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Inflows into Lake Diefenbaker are currently above the upper quartile for this time of year. Inflows are forecast to gradually decline and move closer to the historical median range over the forecast period.
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Lake Diefenbaker water levels are currently below the seasonal median but remain within the historical interquartile range. Water levels are forecast to increase slightly before remaining relatively stable near 555.65 m.
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Conditions will continue to be monitored closely, and outflows may be adjusted as needed based on updated forecasts and observed basin conditions.
Forecast Overview
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Inflows into Lake Diefenbaker are expected to gradually decline from approximately 190 m³/s to 140 m³/s over the forecast period.
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Daily mean outflows are expected to remain steady at approximately 130 m³/s throughout the forecast period.
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Lake Diefenbaker levels are expected to gradually increase from approximately 555.61 m to 555.65 m before remaining relatively stable near the end 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
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Below are the updated plots showing 2026 observed inflows and reservoir elevations compared to historical ranges.
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