Devil's Lake normally maintains a very comfortable swimming temperature from Mid-June to Late September. Picnic areas, grills, and children's play areas including climbing gyms and slides are located throughout the park.
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One other thing to be aware of if you're swimming in a freshwater lake, especially in warmer climates: The Centers for Disease Control and Prevention says that swimmers in freshwater lakes should assume brain-eating amoeba are present, although actual cases of infection are extremely rare.