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Latest heavy rains mean water will be released from Grant Devine Lake near Alameda

Rafferty and Boundary reservoirs will come close to full supply level; south-central Saskatchewan to see heaviest rain
Runoff Souris River
After two April snowstorms, the Souris River sees a higher level of water, however, runoff forecasts for the Estevan area are still below normal.

SOUTHEAST SASKATCHEWAN - The Saskatchewan Water Security Agency has issued an update on the impact that the rain in southern Saskatchewan is having on area reservoirs.

The additional rainfall predicted will bring Boundary and Rafferty reservoirs closer to the preferred operating levels, but is not expected to result in their filling. Grant Devine Lake is near full supply and a release will be initiated from Grant Devine Dam on May 12; however, flows are expected to remain in channel on Moose Mountain Creek and Souris River downstream of the dam.

“The public should exercise caution around fast-moving water and should not attempt to cross any areas where the depth of water is unknown. Significant rainfall has the potential to result in rapid changes in water levels,” the WSA said in a news release.  

The WSA also advises that if the spring storm causes power disruptions to local municipal water systems, local drinking water advisories may be issued as required.

Environment and Climate Change Canada issued a heavy rain warning for southeast Saskatchewan on Thursday.

Heaviest accumulations are expected to be observed over south-central areas of the province, particularly in the Poplar River Basin near Coronach, eastern portions of the Old Wives Lake Basin near Assiniboia and over Avonlea Creek.

With snowmelt runoff complete for this area of the province, the Water Security Agency (WSA) does not expect significant impacts to water flows and levels; however, localized issues are possible where accumulations are highest.

Areas east of Regina from the United States Border to Jan Lake, where conditions have been wetter over the past month, could see increasing flows, potentially to flood levels, particularly on Pipestone Creek, Antler River and tributaries within the Lower Red Deer River Basin near Hudson Bay, including the Fir and Overflowing rivers. The Assiniboine River is still seeing some higher flows after spring runoff; significant precipitation could cause the river to spill over resulting in localized flooding.

The WSA says it will continue to monitor and provide updates to the potential for flooding from this precipitation watch and the runoff across the province as the spring melt continues.