United States Lightship WLV-613

The United States Lightship WLV-613 (Ambrose) was a lightvessel commissioned in 1952 that became the last lightship to mark the Ambrose Channel. She was replaced by a Texas Tower lightstation on 24 August 1967.

The Ambrose was reassigned as a relief ship on the Massachusetts coastline from 1967–79. After being renamed Nantucket II, in 1979, she was reassigned to Nantucket Shoals. She alternated with her sister ship, the Lightship Nantucket (WLV-612) relieving each other approximately every 21 days. The Ambrose was also the last lightship to mark the Nantucket channel on 20 December 1983. She was decommissioned and retired in 1983. The Ambrose is now privately owned and berthed along Main Street in Wareham, Massachusetts. Currently she is closed to the public.