Lake Mills Lake is a man-made reservoir located in Lake Mills, Wisconsin. It was created by damming the Koshkonong River and serves as a recreational area for fishing, boating, and swimming. The lake covers approximately 1,200 acres and is known for its scenic beauty and diverse wildlife. The surrounding area features parks and trails, making it a popular destination for outdoor activities. Lake Mills hosts various events throughout the year, attracting visitors who enjoy nature and community gatherings. The lake is also home to several species of fish, including bass and panfish, making it a favored spot for anglers.