Lake DuBay is a reservoir on the Wisconsin River in Marathon and Portage Counties in the U.S. state of Wisconsin. The lake covers an area of 6,700 acres (2,700 ha) and has a maximum depth of 30 feet (9.1 m). A dam on the lake is used to generate hydroelectric power. The community of Knowlton is located on the shore of the lake, as are 122 homes and three parks. Interstate 39 and U.S. Route 51 provide access to the lake, as do several county highways.
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