A lightvessel, or lightship, is a ship that acts as a lighthouse. They are used in waters that are too deep or otherwise unsuitable for lighthouse construction. Although some records exist of fire beacons being placed on ships in Roman times, the first modern lightvessel was off the Nore sandbank at the mouth of the River Thames in England, placed there by its inventor Robert Hamblin in 1734. The type has become largely obsolete; lighthouses replaced some stations as the construction techniques for lighthouses advanced, while large, automated buoys replaced others.
United States lightship Chesapeake (LS-116/WAL-538/WLV-538) is a museum ship owned by the National Park Service and on a 25-year loan to Baltimore City, and is operated by Historic Ships in Baltimore Museum in Baltimore, Maryland. A National Historic Landmark, she is one of a small number of preserved lightships. Since 1820, several lightships have served at the Chesapeake lightship station and have been called Chesapeake. Lightships were initially lettered in the early 1800s, but then numbered as they were often moved from one light station to another. The name painted on the side of lightships was the short name of the Light Station they were assigned to and was the day time visual aspect of the many Aids to Navigation on board lightships. The United States Coast Guard assigned new hull numbers to all lightships still in service in April 1950. After that date, Light Ship 116 was then known by the new Coast Guard Hull number: WAL-538. In January 1965 the Coast Guard further modified all lightship hull designations from WAL to WLV, so Chesapeake became WLV-538.
Northwest Seaport Maritime Heritage Center is a nonprofit organization in Seattle, Washington dedicated to the preservation and interpretation of Puget Sound and Northwest Coast maritime heritage, expressed through educational programs and experiences available to the public aboard its ships. The organization owns three large historic vessels docked at the Historic Ships' Wharf in Seattle's Lake Union Park; the tugboat Arthur Foss (1889), Lightship 83 Swiftsure (1904), and the halibut fishing schooner Tordenskjold (1911). These vessels are used as platforms for a variety of public programs, ranging from tours and festivals to restoration workshops and vocational training.
USCGC Balsam (WLB-62) was a Cactus-class seagoing buoy tender (WLB) in the United States Coast Guard. She operated in the Pacific Ocean during World War II, then saw service along the United States West Coast, Hawaii, and Alaska. After her decommissioning in 1975, she was repurposed as a crab catcher-processor and is active in Alaskan fisheries as F/V Baranof.
USCGC Onondaga (WPG-79), a United States Coast Guard cutter, was built by Defoe Boat Works in Bay City, Michigan, commissioned on 11 September 1934. From its commissioning until 1941, Onondaga was stationed at Astoria, Oregon, where she performed important law enforcement duties and rendered much assistance to ships in distress. Each year she patrolled the annual pelagic seal migration to the Pribilof Islands, and she attempted to prevent out of season halibut fishing.
Light Vessel Number 83 (LV-83) Swiftsure is a lightship and museum ship owned by Northwest Seaport in Seattle, Washington. Launched in 1904 at Camden, New Jersey and in active service until 1960 after serving on all five of the American west coast's lightship stations, it is the oldest surviving lightship in the United States, the only one still fitted with its original steam engine, and the last lightship with wooden decks. LV-83 was designated a National Historic Landmark in 1989, and has been undergoing major restoration since 2008.
USS Yuma (AT-94/ATF-94/T-ATF-94) was a Navajo-class fleet tugboat constructed for the United States Navy during World War II. She was the second U.S. Navy ship named for the Yuma tribe of Arizona.
The United States Coast Guard Cutter Fir was the last lighthouse tender built specifically for the United States Lighthouse Service to resupply lighthouses and lightships, and to service buoys. Fir was built by the Moore Drydock Company in Oakland, California in 1939. On 22 March 1939, the U.S. Lighthouse Tender Fir was launched. She was steam driven with twin screws, 175 feet (53 m) in length, had a beam of 32 feet (9.8 m), drew 11 feet 3 inches (3.43 m) of water, and displaced 885 tons. Fir was fitted with a reinforced bow and stern, and an ice-belt at her water-line for icebreaking. She was built with classic lines and her spaces were lavishly appointed with mahogany, teak, and brass. The crew did intricate ropework throughout the ship. The cost to build Fir was approximately US$390,000. Fir's homeport was Seattle, Washington for all but one of her fifty one years of service when she was temporarily assigned to Long Beach, California when USCGC Walnut was decommissioned on 1 July 1982.
United States lightship Nantucket (LV-112) is a National Historic Landmark lightship that served at the Lightship Nantucket position. She was the last serving lightship and at time of its application as a landmark, one of only two capable of moving under their own power. She served as the lightship for such notable vessels as the liners United States, Queen Mary, and Normandie.
Lightship No. 114, later U.S. Coast Guard WAL 536, that served as lightship Fire Island (NY), Examination Vessel, Diamond Shoal (NC), 1st District relief vessel, Pollock Rip (MA) and Portland (ME). After decommissioning in 1971, in 1975 the lightship became a historic ship at the State Pier in New Bedford, Massachusetts. She received little maintenance, and eventually sank at her moorings in 2006 and was sold for scrap the next year.
USCGC Citrus (WAGL-300/WLB-300/WMEC-300) was a Cactus (A)-class seagoing buoy tender built in 1942 in Duluth, Minnesota, and now operated by the navy of the Dominican Republic.
No. 115 Squadron was a Royal Canadian Air Force Canadian Home War Establishment (HWE) Squadron that operated during World War II.
USFS Eider was an American motor schooner in commission in the fleet of the United States Bureau of Fisheries from 1919 to 1940 and, as US FWS Eider, in the fleet of the U.S. Fish and Wildlife Service from 1940 to 1942 and again in the late 1940s. She ran a passenger-cargo service between Unalaska and the Pribilof Islands, and also carried passengers, supplies, and provisions to destinations on the mainland of the Territory of Alaska and in the Aleutian Islands. She occasionally supported research activities in Alaskan waters and the North Pacific Ocean, and she conducted patrols to protect Alaskan fisheries and marine mammals. In 1924, she provided logistical support to the first aerial circumnavigation of the world.
MV Brown Bear was an American research vessel in commission in the fleet of the United States Department of Agriculture′s Bureau of Biological Survey and Alaska Game Commission from 1934 to 1940 and in the fleet of the United States Department of the Interior′s Fish and Wildlife Service from 1940 to 1942 and from 1946 to 1951, under the control of the University of Washington from 1952 to 1965, and in commission in the fleet of the United States Fish and Wildlife Service from 1965 to 1970 and of the National Oceanic and Atmospheric Administration′s National Marine Fisheries Service (NMFS) from 1970 to 1972.
Albina Engine & Machine Works was a shipyard along the Willamette River in Portland, Oregon, United States. It was located in the Albina area of Portland along N. River Street and N. Loring Street. Albina Engine & Machine Works was founded in 1904. The shipyard produced a number of freighters during World War I, but operated mainly as a repair yard during the 1920s and 1930s. The Albina yard expanded its workforce and production during Portland's World War II shipbuilding boom. It specialized in producing subchasers, vessels designed to combat German U-boats. Albina Engine & Machine Works also built Landing Craft Support boats and cargo ships. Business declined in the post-war years, and Albina Engine & Machine Works was sold to the Dillingham Corporation around 1971.
The USS YP-72 (ex-Cavalcade) was a converted fishing vessel which served as an auxiliary patrol boat in the U.S. Navy during World War II.
The USS YP-73 (ex-Corsair) was a converted fishing vessel which served as an auxiliary patrol boat in the U.S. Navy during World War II.
USS YP-74 (ex-Endeavor) was a converted fishing vessel which served as an auxiliary patrol boat in the U.S. Navy during World War II.
USCGC Hemlock (WAGL-217) was a lighthouse tender in commission in the fleet of the United States Lighthouse Service as USLHT Hemlock from 1934 to 1939, and in the fleet of the United States Coast Guard as USCGC Hemlock from 1939 to 1958. During World War II, she was given the additional designation (WAGL-217).
YP-251 was a converted fishing vessel which served in the U.S. Navy during World War II from 1941 to 1945. She operated in the waters of the Territory of Alaska during the war. Before the war, she operated as the commercial fishing vessel MV Foremost from 1924 to 1941. After the war, she again operated as the commercial vessel MV Foremost from 1946 to 1954, then was renamed MV LeRoy.
United States Lighthouse Service 
United States Coast Guard
