Duke Island Park is a Somerset County Park in Bridgewater Township, New Jersey. The park includes trails, which are part of the Raritan River Greenway and currently connects the southwestern corner of Bridgewater with Raritan center and Hillsborough Township. The park covers 339 acres (137 ha) and is bounded by the Raritan River to the south and by the Raritan Water Power Canal on the other three sides. The park is home to numerous trail, several sports fields, and a bandstand that has free summer concerts.