The new lighthouse was made of curved cast-iron plates whose seams are disguised by six decorative Corinthian columns.

Its design was inspired by the Choragic Monument of Lysicrates in Athens, made well-known by engravings.

The architect was Thomas U. Walter, most noted as the designer of the U.S. Capitol east and west wings and its current dome.

Wooden sheds and a six-room house for the lighthouse-keeper were added incrementally as needed.

During World War II, the breakwater was slowly absorbed by landfill as the New England Shipbuilding Corporation built two shipyards next to the lighthouse.