 However, the construction in 1889 of the jetties which protect the shipping lanes leading to Charleston Harbor altered ocean currents, resulting in the rapid erosion of Morris Island and the destruction of many structures and historical sites (such as Fort Wagner).By 1938 the shoreline had reached the lighthouse, forcing its automation as it was no longer safe or practical to keep it manned.In 1962 the Morris Island Light was decommissioned and replaced by the new Charleston Light, located on Sullivan's Island at the north end of the harbor.