About WSA

Outflow From Lake Diefenbaker to See Further Reduction

June 24, 2015 – The Water Security Agency (WSA) is advising the public of another reduction in outflow from Lake Diefenbaker.

Starting June 30, 2015, WSA will be reducing the outflow from Gardiner Dam on the South Saskatchewan River from daily averages of 80 cubic metres per second (m3/s) to 60 m3/s in order to maintain a certain level in the reservoir.

Mountain inflows to Lake Diefenbaker are expected to be well below normal from June to September. The above normal seasonal temperatures combined with very little direct precipitation are also causing increased evaporation on the lake which is impacting the water level. The long-range forecast is also calling for very little precipitation.

The reduction in outflow is expected to result in the South Saskatchewan River downstream of Gardiner Dam dropping by approximately 0.14 m from current levels. The South Saskatchewan River through the City of Saskatoon is expected to see a decrease of 0.05 m upstream of the weir. Downstream of the Saskatoon weir the river is expected to decrease 0.11 m.          

Currently, Lake Diefenbaker is at 554.25 m which is roughly 0.67 m below the normal level for this time of year.  Based on the current forecast, WSA does not expect the reservoir to rise much more, which would make this the sixth lowest peak elevation in the last 45 years.

With low flows from the dam there is some difficulty maintaining steady flow and users immediately downstream could see some fluctuations.

In early July, WSA will be issuing a Water Supply Outlook which will give an update as to the current situation in the province. For more information on water levels and stream flows visit www.wsask.ca.

The Water Security Agency was created to lead implementation of the 25 Year Saskatchewan Water Security Plan.  It will improve water management capacity and service to individuals, businesses and communities across Saskatchewan.  The agency brings together all of the major responsibilities related to water quality and quantity.


For more information, contact:

Patrick Boyle
Water Security Agency
Moose Jaw
Phone: 306-694-8914
Email: Patrick.Boyle@wsask.ca
Cell: 306-631-6997