Hop Brook Lake is a day-use park managed by the US Army Corps of Engineers, situated on the Middlebury/Naugatuck town line. The park features a lake with a swimming beach, numerous hiking and walking trails, and ample picnic areas. It's a popular destination for families, outdoor enthusiasts, and those seeking a relaxing day in nature. While generally well-maintained, water quality concerns occasionally lead to beach closures. The park offers amenities such as BBQ areas, picnic tables, benches, and dog waste stations. Mountain bike races have been held at the location.