Lake Petenwell is the second-largest lake in Wisconsin, covering approximately 23,000 acres. It is located in Adams County and is a popular destination for outdoor activities such as fishing, boating, and swimming. The lake is known for its diverse fish population, including walleye, northern pike, and crappie. The lake was created in the 1970s by the construction of the Petenwell Dam on the Wisconsin River. Surrounding the lake are several parks and recreational areas, making it an ideal spot for camping and hiking. The scenic beauty and recreational opportunities attract visitors year-round.