The second Coffin Island Lighthouse, built in 1914 as a replacement for the original, was a white octagonal concrete tower, 16.5 meters tall, and showed a flashing white light. As the shoreline at the point where the lighthouse stood gradually eroded away, the tower was in danger of toppling into the sea. The Coffin Island Lighthouse Heritage Society was formed and mounted a successful drive to build a stone armor wall in 199to protect the lighthouse, but after a few years, it was apparent that the erosion could be retarded but not stopped. A new fiberglass tower, was erected on Coffin Island, 330 feet from the shore, in October 2006, and the concrete tower was demolished.
Coffin Island Lighthouse marks the entrance to Liverpool Bay by eastern approaches, while the western approaches are marked by Western Head Lighthouse.