Hopatcong State Park is a state park in the Landing section of Roxbury Township, New Jersey, United States. Operated and maintained by the New Jersey Division of Parks and Forestry, the park consists of two discrete parcels of land, one that encompasses Lake Hopatcong and a parcel of land on its southwestern shore, and another that encompasses Lake Musconetcong about one mile to the west-southwest.
The park contains remnants of Morris Canal, which operated from the 1830s to the 1920s and was largely fed by the lake. The park is also home to the Lake Hopatcong Historical Museum, open Sundays during spring and fall, and housed in what was once the home of the resident lock tender and his family.
Swimming is permitted in the park from Memorial Day through Labor Day while lifeguards are on duty.
Subject to NJDEP regulations, there is year-round fishing at Lake Hopatcong and Lake Musconetcong, which are stocked by New Jersey Division of Fish and Wildlife stocks them with brown trout, rainbow trout and brook trout. Commonly caught warmwater species include large mouth bass, sunfish, catfish, perch and pickerel. During the winter, ice fishing is allowed (conditions permitting).
Lake Hopatcong allows for any type of boating, ranging from canoes to large motor boats, sailboats, sailboards and Jet Skis. Boats are available for rent at many private marinas around the lake. Boating is subject to New Jersey Boating Regulations and Marine Law. There is a boat ramp in the park itself.