2011 Souris River flood

The 2011 Souris River flood was greater than the hundred-year flooding event for the Souris. The US Army Corps of Engineers estimated the flood to have a recurrence interval between 200 and 500-years. The Souris River is a tributary of the Assiniboine River, which it meets near Treesbank, Manitoba. The Assiniboine meets the Red River of the North in Winnipeg, Manitoba. The flooding has affected Saskatchewan and North Dakota, and overtopped levees in Minot, North Dakota causing the evacuation of about 11,000 residents. The flooding in Minot was worse than the 1969 flood and 1881 flood. Many other towns along the river were affected and many acres of farmland were inundated.

Flooding in Saskatchewan the previous summer, in addition to heavy snowfall and a thick snowpack from the previous La Niña winter added to overflow on rivers across North America. Since May 2011, heavy rains and thunderstorms driven by a series of cut off lows migrating westward triggered more flooding on watersheds in the southern Prairie Provinces, as some communities received nearly the annual rainfall in less than two months.

In early May, flash flooding occurred between the Souris River source and the Assiniboine River, as Kingsley No. 124, Saskatchewan saw its worst flooding in over 50 years. Towards late May, barely half Saskatchewan's agricultural crops had been seeded, while southeastern Saskatchewan, surrounding the Souris River was the worst-hit. However, even as the flooding continued in northern Saskatchewan, Alberta, and the Northwest Territories, significant fires burned while the weather remained dry and lightning was able to spark new blazes.

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