Charleston Light, also known as Sullivan's Island Lighthouse, is located on Sullivan's Island, South Carolina, which is the northern entrance to Charleston Harbor. Designed by Thomas Sullivan, the lighthouse was erected to replace the defunct Morris Island Light on Morris Island, which was at risk of being destroyed by erosion, but which remains standing and was stabilized in 2010. Construction of the Charleston Light was started in 1960, and it was first lit on June 15, 1962.