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Pewaukee Lake is a lake located in Waukesha County, Wisconsin, United States. The largest lake in Waukesha County's "Lake Country", Pewaukee Lake is approximately five miles (8 km) long and one mile (1.6 km) wide, with an average depth of 15 feet (4.6 m) sloping to a maximum depth of 46 feet (14 m). The lake is known for its inland sailing races. National sailing events take place annually and are often hosted by the Pewaukee Yacht Club located on the southern shore of the lake.