Farallon Islands

Coordinates: 37°43′30″N 123°01′49″W / 37.7249303°N 123.0302779°W / 37.7249303; -123.0302779
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Farallon Islands National Wildlife Refuge
Southeast Farallon Islands from the west, with Maintop Island in the foreground (right)
LocationPacific Ocean
Nearest citySan Francisco, California, United States
Coordinates37°43′30″N 123°01′49″W / 37.7249303°N 123.0302779°W / 37.7249303; -123.0302779
Area41.9 acres (17.0 ha)
Established1969
Governing bodyUnited States Fish and Wildlife Service
WebsiteFarallon Islands National Wildlife Refuge
Farallone Islands
Area211 acres (85.4 ha)
Built1539
NRHP reference No.77000332[1]
Added to NRHPMarch 08, 1977
Farallon Islands, with border of Farallon Islands National Wildlife Refuge
Southeast Farallon Islands (from nautical chart of 1957)

The Farallon Islands, or Farallones (from the Spanish farallón meaning "pillar" or "sea cliff"), are a group of islands and sea stacks in the Gulf of the Farallones, off the coast of San Francisco, California, United States. The islands are also sometimes referred to by mariners as the Devil's Teeth Islands, in reference to the many treacherous underwater shoals in their vicinity.[2] The islands lie 30 miles (48 km) outside the Golden Gate and 20 miles (32 km) south of Point Reyes, and are visible from the mainland on clear days. The islands are part of the City and County of San Francisco. The only inhabited portion of the islands is on Southeast Farallon Island (SEFI), where researchers from Point Blue Conservation Science and the U.S. Fish and Wildlife Service stay.[3] The islands are closed to the public.[4]

The Farallon Islands National Wildlife Refuge is one of 63 National Wildlife Refuges that have congressionally designated wilderness status.[5] In 1974 the Farallon Wilderness was established (Public Law 93-550) and includes all islands except the Southeast Island for a total of 141 acres (57 ha).[6]

History

Aerial view of the Southeast Farallon Island from the south

The islands were long known by the name Islands of the Dead to the American Indians who lived in the Bay Area prior to the arrival of Europeans, but they are not thought to have traveled to them, either for practical reasons (the voyage and landing would be difficult and dangerous) or because of spiritual beliefs (the islands were believed to be an abode of the spirits of the dead).[7][8][9]

The first Europeans to see these islands were most probably the members of the Juan Cabrillo expedition of 1542 which sailed as far north as Point Reyes, however no source record of the Cabrillo expedition's actual sighting of these islands has survived.[10] The first European to create a record of the islands which has survived was the English privateer and explorer Sir Francis Drake, on July 24, 1579. On that day, Drake landed on the islands in order to collect seal meat and bird eggs for his ship.[11][12] He named them the Islands of Saint James because the day after his arrival was the feast day of St James the Great. The name of St James is now applied to only one of the rocky islets of the North Farallones.

The islands were apparently first given their names of the “Farallones” (literally, “cliffs”) by Friar Antonio de la Ascencion, aboard the Spanish explorer Sebastián Vizcaíno's 1603 expedition. De la Ascension wrote in his diary, "Six leagues before reaching Punta de los Reyes (Point Reyes) is a large island, two leagues from land and three leagues northwest of this are . . . seven farallones close together."[13] It is believed that probably for the next two centuries after their discovery, their rather ominous appearance, lying just off the entrance to San Francisco Bay, most likely caused the earlier mariners to prefer to skirt far to the West and offshore from the entrance to the bay, thus leading to the much later discovery of the San Francisco Bay by land over two centuries after the 1542 discovery of the islands. In 1769 the bay inlet was finally discovered soon after an overland sighting of the bay was made from what is now the Pacifica area.[2]

In the years following the discovery of the islands, during the Maritime Fur Trade era, the islands were exploited by seal hunters, first from New England and later from Russia. The Russians maintained a sealing station in the Farallones from 1812 to 1840, taking 1,200 to 1,500 fur seals annually, though American ships had already exploited the islands.[14] The Albatross, captained by Nathan Winship, and the O'Cain, captained by his brother Jonathan Winship, were the first American ships sent from Boston in 1809 to establish a settlement on the Columbia River. In 1810, they met up with two other American ships at the Farallon Islands, the Mercury and the Isabella, and at least 30,000 seal skins were taken.[15][16] By 1818 the seals diminished rapidly until only about 500 could be taken annually and within the next few years, the fur seal was extirpated from the islands. It is not known whether the northern fur seal or the Guadalupe fur seal were the islands' native fur seal, although the northern fur seal is the species that began to recolonize the islands in 1996.[17]

On July 17, 1827, the French sea captain Auguste Duhaut-Cilly sailed by the southernmost Farallon Island and counted the "crude dwellings of about a hundred Kodiaks stationed there by the Russians of Bodega...the Kodiaks, in their light boats, slip into San Francisco Bay by night, moving along the coast opposite the fort, and once inside this great basin they station themselves temporarily on some of the inner islands, from where they catch the sea otter without hindrance."[18]

After Alta California was ceded by Mexico to the United States in 1848 with the Treaty of Guadalupe Hidalgo, the islands' environment became linked to the growth of the city of San Francisco. Beginning in 1853, a lighthouse was constructed on SEFI. As the city grew, the seabird colonies came under severe threat as eggs were collected in the millions for San Francisco markets. The trade, which in its heyday could yield 500,000 eggs a month, was the source of conflict between the egg collecting companies and the lighthouse keepers. This conflict turned violent in a confrontation between rival companies in 1863. The clash between two rival companies, known as the Egg War, left two men dead and marked the end of private companies on the islands, although the lighthouse keepers continued egging. This activity, combined with the threat of oil spills from San Francisco's shipping lanes, prompted President Theodore Roosevelt to sign Executive Order No. 1043 in 1909, creating the Farallon Reservation to protect the chain's northern islands. This was expanded to the other islands in 1969 when it became a National Wildlife Refuge.

The islands are the site of many shipwrecks. The liberty ship SS Henry Bergh, a converted troop carrier that hit West End in 1944, pieces of which can still be seen from the island today (all hands were saved). The USS Conestoga, a US Navy tugboat that disappeared with its 56 crew members in 1921, was found in 2009 and positively identified in 2016. (The Conestoga had sailed from nearby San Francisco, but the waters of the Farallones were never searched because the vessel was assumed to have traveled far out into the Pacific.)[19]

Noted computer scientist Jim Gray was lost at sea after setting out on a solo sailing trip from San Francisco to the Farallones on January 28, 2007. Despite an unusually thorough search, neither his body nor his boat was ever found.[20]

The islands have also been mentioned in connection with the schooner Malahat as one possible site for Rum Row during Prohibition.[21] The United States Coast Guard maintained a manned lighthouse until 1972, when it was automated. The islands are currently managed by the United States Fish and Wildlife Service, in conjunction with the Marin-based Point Blue Conservation Science (formerly Point Reyes Bird Observatory – PRBO). The islands are currently the subject of long term ecological research. Today, the Farallones are closed to the public, although birders and wildlife enthusiasts can approach them on whale watching boats and the sail-training vessel Seaward out of Sausalito.[22]

From 1902 to 1913, the former U.S. Weather Bureau maintained a weather station on the southeast island, which was connected with the mainland by cable. The results of the meteorological study were later published in a book on California's climate. Temperatures during those years never exceeded 90 °F (32 °C) or dropped to 32 °F (0 °C).[23] Years later, the National Weather Service provided some weather observations from the lighthouse on its local radio station.

Three people have successfully swum from the Farallones to the Golden Gate, with two more swimming to points north of the Gate. The first, Ted Erikson, made the swim in September 1967, with the second, Joseph Locke, swimming to the Golden Gate on July 12, 2014, in 14 hours.[24] The third person, and the first woman to complete the distance, Kimberley Chambers, made it in just over 17 hours on Friday August 7, 2015.[25]

Geology

The Farallon Islands are outcroppings of the Salinian Block, a vast geologic province of granitic continental crust sharing its origins with the core of the Sierra Nevada Mountains. The block was rifted off far to the south of its present position and moved north with the Pacific Plate on which the islands rest. Other nearby examples of the Salinian Block include the Point Reyes Peninsula and Bodega Head. The San Andreas Fault, marking a boundary zone between the Pacific and North American Plates, passes a few miles east of the islands.

The ancient Farallon Plate is named after the islands.

Geography

View of research station at Marine Terrace, with Farallon Island Light above

Overview

The islands string northwestward from Southeast Farallon Island for 5 miles (8.0 km). Their total land area is 0.16 square miles (0.41 km2). The islands were initially exploited for bird eggs and fur seal skins, then used as a lighthouse station and a radio station. They have been protected in the Farallon Islands National Wildlife Refuge, first established in 1909 with the Southeast Farallons added in 1969,[26] and contain the largest seabird colony in the U.S. outside of Alaska and Hawaii. The islands are part of the City and County of San Francisco, and are considered part of Supervisorial District One (Northwest), also called Richmond District.

Block
Nr.[note 1] 		Island(s) or Bank Area
(m2) 		Height
(m) 		Coordinates
2000 South Farallon Islands 387,688 109 37°41′49″N 123°00′07″W / 37.69694°N 123.00194°W / 37.69694; -123.00194 (South Farallon Islands)
2001 Middle Farallon Island 3,362 6 37°43′37″N 123°01′52″W / 37.72694°N 123.03111°W / 37.72694; -123.03111 (Middle Farallon Islands)
2002 North Farallon Islands 28,270 47 37°45′37″N 123°05′49″W / 37.76028°N 123.09694°W / 37.76028; -123.09694 (North Farallon Islands)
– Fanny Shoal – −4 37°46′40″N 123°10′19″W / 37.77778°N 123.17194°W / 37.77778; -123.17194 (Fanny Shoal)
2999[note 2] Farallon Islands 419,320 109  
  1. ^ of Block group 2, Census tract 604, San Francisco County, California[27]
  2. ^ Block Number of Territorial Waters, with an area of 247,530,823 m2

South Farallon Islands

Aulon Island of Aulon Arch, Great Arch Rock and Sugarloaf, as seen from SEFI
Farallon Islands and banks further northwest
  • Southeast Farallon Island (SEFI) is the largest island, with an area of 95.79 acres or 0.14970 square miles (0.3877 km2), and is the only inhabited one. The island is pyramidal in shape and 357 feet (109 m) high. The peak, Tower Hill (actually a double peak consisting of Lighthouse Hill and Little Lighthouse Hill), is the location of a lighthouse, the Farallon Island Light. The large flat area in the southeast of the island is called Marine Terrace. Immediately south of it is Mussel Flat, about 100 feet (30 m) by 400 feet (120 m), which is cut off from the main island only during high tide.
  • Seal Rock (Saddle Rock), about 800 feet (240 m) south of SEFI, is about 350 feet (110 m) by 800 feet (240 m) in size and 80 feet (24 m) high.
  • Maintop Island (West End) is immediately to the west of SEFI, separated by a narrow impassable gorge, The Jordan (Jordan Channel), which connects Mirounga Bay in the south to Maintop Bay in the north. It is the second largest island, and 220 feet (67 m) high at Main Top hill in its eastern part. The Great West Arch, or Aulon Arch is a rock formation, is in the west of the island, and Indian Head in the south.
  • The Drunk Uncle Islets are a group of small rocks just northwest off Maintop Island.
  • Aulon Island and smaller Great Arch Rock (Arch Rock) are immediately north of the northern tip of SEFI, and together about 200 feet (61 m) by 350 feet (110 m) in size. They are barely separated by a narrow gorge. Great Arch Rock is not to be confused with Great West Arch, a rock formation in the west of Maintop Island.
  • Sugarloaf Island (usually just referred to as Sugarloaf) is northeast of Great Arch Rock, and just slightly larger in size, with a height of 80 feet (24 m). Southwest of Aulon Island, Great Arch Rock and Sugarloaf Island, and in the northeast of SEFI, is protected Fisherman Bay.
  • Sea Lion Rock is just northwest of Aulon Island, diameter approximately 130 feet (40 m).
  • Hurst Shoal is located about one kilometer southeast of the southeastern corner of SEFI. It has a least depth of 20 feet (6.1 m).

Middle Farallon Island

Middle Farallon Island, 2 miles (3.2 km) northwest of SEFI, is a 20-foot (6.1 m) high guano-covered black rock about 65 meters in diameter, with an area of 3,362 m2. This island is informally known as "the pimple."

North Farallon Islands

North Farallon Islands seen from south

North Farallon Islands, about 7 km further northwest, consist of two clusters of bare precipitous islets and rocks 31 to 85 meters high, with an aggregate area of 28,270 m2

  • North Farallon Island, 31 meters high, about 150 meters long north-south, 9,260 m2
  • Island of St. James, 47 meters high, about 125 meters in diameter, 12,380 m2
  • unnamed rock, about 85 meters in diameter, and 5,640 m2 in area
  • four smaller unnamed rocks, diameter 20 meters and less

Some of those unnamed rocks, however, have Spanish names, such as Piedra Guadalupe, Peñasco Quebrado and Farallón Vizcaíno.

Fanny Shoal

5 km WNW of the North Farallones is Fanny Shoal, a bank 3 km in extent, with depth less than 55 meters, marking the northernmost and westernmost feature of the group, albeit entirely submerged. Noonday Rock, which rises abruptly from a depth of 37 meters, with a least depth of 4 meters (13 feet) over it at low tide, is the shallowest point of Fanny Shoal. There is a lighted bell buoy about 1 km west of Noonday Rock. Noonday Rock, formerly known as Fanny Rock, derives its name from that of the clipper ship that struck it on January 1, 1863, and sank within one hour.[28][29]

Banks northwest of Fanny Shoal

The banks northwest of Fanny Shoal are not considered part of the Farallon Islands anymore, and they are outside of U.S. territorial waters. About 25 km northwest of Fanny Shoal is Cordell Bank, a significant marine habitat (38°01′N 123°25′W / 38.017°N 123.417°W / 38.017; -123.417). About halfway between Fanny Shoal and Cordell Bank is Rittenburg Bank, with depths of less than 80 meters (37°53′N 123°18′W / 37.883°N 123.300°W / 37.883; -123.300).

Flora and fauna

Common murre colony on the Farallones

Seabirds

The Farallon Islands are an important reserve protecting a huge seabird colony. The islands' position in the highly productive California Current and eastern Pacific upwelling region, as well as the absence of other large islands that would provide suitable nesting grounds, result in a seabird population of over 250,000. Twelve species of seabird and shorebird nest on the islands; western gull, Brandt's cormorant, pelagic cormorant, double-crested cormorant, pigeon guillemot, common murre, Cassin's auklet, tufted puffin, black oystercatcher, rhinoceros auklet, ashy storm-petrel, and Leach's storm-petrel. Since the islands were protected, common murres, which once numbered nearly 500,000 pairs but suffered from the egg collecting, oil spills and other disturbances that had greatly reduced their numbers, recovered and climbed from 6,000 birds to 160,000. Additionally, since protection, the locally extinct rhinoceros auklet has begun to breed on the islands again. The island has the world's largest colonies of western gulls and ashy storm petrels, the latter species being considered endangered and a conservation priority. The island also is the wintering ground of several species of migrants, and regularly attracts vagrant birds (about 400 species of bird have been recorded on or around the island).

Seals

Five species of pinniped come to shore on the islands, and in some cases breed. These are the northern elephant seal, harbor seal, Steller's sea lion, California sea lion, and the northern fur seal (the last of which, like the rhinoceros auklet, began to return to the island again after protection).

American whalers took 150,000 northern fur seals (Callorhinus ursinus) from the Farallons between 1810 and 1813, followed by Russian fur hunters who lived on the Farallons and extirpated the pinnipeds from the islands. In 1996 West End Island became the fourth American northern fur seal rookery when a pup was born. The recolonizers bore tags from San Miguel Island in the Channel Islands, which had been itself recolonized in 1968.[30] By 2006, nearly 100 pups were born.[31] The fur seals are aggressive and have displaced larger sea lions from their territory. The high count for 2011 was 476 individuals, a 69 percent increase from the year before.[32] By 2016, the pup count alone was 1,126, reflecting a 21% average (but highly variable) annual increase in new pups over the 21 years since recolonization. If the South Farallon Islands population reaches its estimated historical size of 100,000 individuals, it could account for approximately one-fifth of the world's northern fur seal population.[33]

Northern elephant seals (Mirounga angustirostris) recolonized the refuge in 1959 with a confirmed pup in 1972.[34] The elephant seal rookery on Southeast Farallon has probably reached carrying capacity.

Whales

Several species of cetaceans are found near the Farallon Islands, most frequently gray whales, blue whales, and humpback whales. Blue whales and humpback whales are most frequently found near the islands in the summer and fall, when strong upwelling may support a rich pelagic food web. Orca whales are also found around the islands. Gray whales are reliably found near the Farallones during their spring migration north and the fall/winter migration south. Some gray whales may also be found during the summer, when a few whales skip the trip north to Alaska and spend the summer months off the coast of Canada and the continental United States.

In December 2005 one humpback was rescued from netting entanglement east of the Farallones by staff of The Marine Mammal Center.[35] The last sighting of another famous humpback, named Humphrey, was near the Farallones in 1991. The islands are in the Gulf of the Farallones National Marine Sanctuary, which protects the feeding grounds of the wildlife of the refuge.

Sharks

The elephant seal population attracts a population of great white sharks to the islands. In 1970 Farallon biologists witnessed their first shark attack, on a Steller's sea lion. During the next fifteen years, more than one hundred attacks on seals and sea lions were observed at close range. By the year 2000, biologists were logging almost eighty attacks in a single season.[36]

While the males return annually, the females return only every other year, often with fresh, deep bites around their heads. The seasonal shark population at the Farallones is unclear, with estimates from thirty to one hundred. The Farallones are unique in the size of the great whites that are attracted. The average length of a full-grown great white shark is 4 to 4.8 metres (13 to 16 ft), with a weight of 680 to 1,100 kg (1,500 to 2,430 lb), females generally being larger than males. Farallon great whites range between the "smaller" males at 13 ft (4.0 m) to the females, which generally range between 17 to 19 ft (5.2 to 5.8 m). The largest accurately measured great white shark was a female caught in August 1988 at Prince Edward Island off the North Atlantic coast and measured 20.3 ft (6.2 m). A killer whale was recorded killing a great white near the Farallones in 1997.[37] Over the decades of study, many of the individual white sharks visiting the Farallones have been nicknamed, often based off their scars and appearances, such as Gouge, The Hunchback, The Jester, and Stumpy. Stumpy, an 18-foot female great white, in particular was well known for her appearance in the BBC documentary "Great White Shark" narrated by David Attenborough and stock footage of her attacks on decoys is often utilized in more recent documentaries, and another example, Tom Johnson, a 16-foot male white shark that was featured in an episode of the 2012 season of Shark Week called "Great White Highway" is believed to be the oldest living white shark so far documented returning to the Farallones, estimated at around 25–30 years old.[38]

Some individual sharks have been tagged and found to roam the Pacific as far as Hawaii and Guadalupe Island off Baja California, returning regularly to the Farallones every year in the autumn. Satellite tracking has revealed the majority of great white sharks from the Farallones (and from other parts of California, Hawaii and the west coast of Mexico) migrate to an area of ocean dubbed the White Shark Café, 1,500 miles (2,400 km) west of Ensenada, Baja California. The peak of activity at this location is from mid-April to Mid-July, but some shark spend up to eight months of the year there.[39] This island has many migratory sharks return to its waters every year.

Rodents

According to a report in USA Today, it is the most rodent-dense island in the world, with an average of 500 Eurasian house mice occupying each of its 120 acres (49 ha) and an amount of 60,000 total.[40]

Nuclear waste dump

See also: Ocean disposal of radioactive waste
In the above map the approximate locations of two major nuclear waste dumping sites, according to a 1980 United States Environmental Protection Agency report, are indicated.

From 1946 to 1970, the sea around the Farallones was used as a nuclear dumping site for radioactive waste under the authority of the Atomic Energy Commission at a site known as the Farallon Island Nuclear Waste Dump. Most of the dumping took place before 1960, and all dumping of radioactive wastes by the United States was terminated in 1970. By then, 47,500 containers (55-gallon steel drums) had been dumped in the vicinity, with a total estimated radioactive activity of 14,500 Ci. The materials dumped were mostly laboratory materials containing traces of contamination. Much of the radioactivity had decayed by 1980.[41]

Forty-four thousand containers were dumped at 37°37′N 123°17′W / 37.617°N 123.283°W / 37.617; -123.283, and another 3,500 at 37°38′N 123°08′W / 37.633°N 123.133°W / 37.633; -123.133.[41]

The exact location of the containers and the potential hazard the containers pose to the environment are unknown.[42] According to the EPA, attempts to remove the barrels would likely produce greater risk than leaving them undisturbed.[41][dead link]

Waste containers were shipped to Hunters Point Shipyard, then loaded onto barges for transportation to the Farallones. Containers were weighted with concrete. Those that floated were sometimes shot with rifles to sink them.[43]

In January 1951, the highly radioactive hull of USS Independence, which was used in Operation Crossroads and then loaded with barrels of radioactive waste, was scuttled in the area.[44]

See also

References

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  34. ^ "Chapter Two: History and present status of the northern elephant seal population". Elephant seal - population ecology, behavior, and physiology. Berkeley, California: University of California Press. 1994. pp. 29–48. {{cite book}}: |access-date= requires |url= (help); Cite uses deprecated parameter |authors= (help); External link in |chapterurl= (help); Unknown parameter |chapterurl= ignored (|chapter-url= suggested) (help); Unknown parameter |editors= ignored (|editor= suggested) (help)
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  43. ^ Naval Sea Systems Command (NAVSEA) (August 2004). "Historical Radiological Assessment, Volume II, Use of General Radioactive Materials, 1939–2003, Hunters Point Shipyard" (PDF). U.S. Department of the Navy: 6–30. Archived from the original (PDF) on 2011-07-22. Retrieved 2009-08-25. {{cite journal}}: Cite journal requires |journal= (help); Unknown parameter |dead-url= ignored (|url-status= suggested) (help)
  44. ^ "Scientists find radioactive WWII aircraft carrier off San Francisco coast". San Jose Mercury News. April 16, 2015. Retrieved 2015-12-08.

Sources

External links

Wikimedia Commons has media related to Farallon Islands.
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