The goal of this study is to provide a socio-economic risk assessment of the presence of Zebra Mussel in Lake Winnipeg, the Red River, Nelson River and Cedar Lake. The specific objectives of the study are to: (i) provide estimates of the economic value generated by Lake Winnipeg, the Red River, Nelson River and Cedar Lake; and (ii) examine the economic risk of the presence of Zebra Mussel in Lake Winnipeg, the Red River, Nelson River and Cedar Lake.