Provincial Forecast
Regulatory Information
Please find below the October 24, 2025 update:
Lake Diefenbaker Forecast Overview:
- Inflows are expected to remain steady at around 110-120 m³/s.
- Based on the forecasted inflows, the reservoir is expected to increase by 0.02 m over the next 10 days.
- The current plan is to maintain outflows around 90 m³/s.
Current Conditions:
- Flows on the South Saskatchewan River are continuing to slowly rise in response to the declining diversions in Alberta.
- Inflows into Lake Diefenbaker are expected to remain steady near the lower quartile level.
- Outflows from Gardiner Dam are expected to remain near 90 m³/s.
- The reservoir is at 555.10 m. This level is between the lower quartile and median for this time of year. Water levels are expected to be steady next week.
- Outflow from the Qu’Appelle River Dam resumed on Monday October 20. The Qu’Appelle River Dam outflow is 2 m3/s.
Hydrologic Conditions:
- Minimal precipitation was received in the headwaters of the North and South Saskatchewan river basins over the past three days (Oct 20-22).
- No precipitation is forecasted in the headwaters for the next week.
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