Wharton Brook State Park is a state-operated, public recreation area located off U.S. Route 5 in the towns of North Haven and Wallingford, Connecticut. The state park was established in 1918 as a precursor of the modern highway rest stop, with picnic grounds and a service area for automobiles. Park activities center on Allen Brook Pond, a 5acre lake on Allen Brook that empties into Wharton Brook. The park offers fishing, swimming, picnicking, and several short foot paths totaling less than a mile in distance. The park is one of the state's designated trout parks that are stocked with trout on opening day and at other times of the year. Great blue herons and other wildlife may be found in the park.