Among the lighthouse's keepers from 1827 to the mid-1900s were several members of the O'Neill family. The first O'Neill,
John O'Neill had defended the town of Havre de Grace by manning a cannon battery on Concord Point during the
War of 1812. By 1924, local documents describe the lighthouse area as being "seriously blighted"; it apparently remained that way for many years. The lighthouse was decommissioned by the
Coast Guard in 1975; soon after that, the lens was stolen. The structure was added to the
National Register of Historic Places in 1976. Extensive restoration work began in 1979. The keeper's house has since been restored and is open to the public as a museum. In 1983, a fifth-order Fresnel lens borrowed from the Coast Guard was installed in the lantern room. ==See also==