Grand Rapids is a town in Manitoba, Canada, on the northwestern shore of Lake Winnipeg where the Saskatchewan River enters the lake. As …Grand Rapids is a town in Manitoba, Canada, on the northwestern shore of Lake Winnipeg where the Saskatchewan River enters the lake. As the name implies, the river had a significant drop at this point. In modern days, a large hydroelectric plant has been built there. Cedar Lake, a short distance upriver, provides a natural water source for the plant. Provincial Trunk Highway 6, the region's primary roadway, crosses the Saskatchewan River at the Grand Rapids Bridge.