 The road leading to the Wilmington-Penns Grove Ferry across the Delaware River between Wilmington and Penns Grove, New Jersey was completed as a state highway by 1931.By 1936, the Lancaster Pike became a part of DE 48.In addition, the route continued through Wilmington on Lincoln Street, Fourth Street, and Christiana Avenue to the ferry across the Delaware River to Penns Grove, New Jersey, which linked DE 48 to Route 48 in New Jersey.