Mansfield Hollow Reservoir is a man-made lake located in Mansfield, Connecticut. It was created in the 1950s by damming the Willimantic River, primarily for flood control and water supply. The reservoir covers approximately 400 acres and is surrounded by scenic woodlands, making it a popular spot for outdoor activities. The area around the reservoir offers various recreational opportunities, including fishing, boating, and hiking. The Connecticut Department of Energy and Environmental Protection manages the site, ensuring the preservation of its natural beauty and providing facilities for visitors to enjoy the outdoors.