the 2011 assiniboine river flood is a major flood in may 2011 along the assiniboine river south of portage la prairie in manitoba. the flood is expected in impact an area along the river south of portage la prairie. about 100 canadian forces personnel were in the region helping out in controlling the flooding. damages totalled 1 billion the river peaked at about ,60% higher than the previous highest recorded peak of in 1923. the 2011 event is estimated to be a 1 in 300-year flood. the 2011 manitoba floods dfaa payments are estimated at 347 million.