Sunset Lake is a medium-sized reservoir located in and near the city of Bridgeton in southern New Jersey. The reservoir lies mostly in Hopewell Township and Upper Deerfield Township, with a small portion within the Bridgeton city limits. The lake was created by damming the Cohansey River less than one mile upstream from the river's head of tide. The d…Sunset Lake is a medium-sized reservoir located in and near the city of Bridgeton in southern New Jersey. The reservoir lies mostly in Hopewell Township and Upper Deerfield Township, with a small portion within the Bridgeton city limits. The lake was created by damming the Cohansey River less than one mile upstream from the river's head of tide. The dam is located next to Park Drive, a major roadway that cuts throughout the city's park system and connects with Route 49. Originally, the lake was known as "Tumbling Dam Pond".