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Cook Inlet ( tfn, Tikahtnu;  Sugpiaq: ''Cungaaciq'') stretches from the Gulf of Alaska to
Anchorage Anchorage () is the largest city in the U.S. state of Alaska by population. With a population of 291,247 in 2020, it contains nearly 40% of the state's population. The Anchorage metropolitan area, which includes Anchorage and the neighboring ...
in south-central
Alaska Alaska ( ; russian: Аляска, Alyaska; ale, Alax̂sxax̂; ; ems, Alas'kaaq; Yup'ik: ''Alaskaq''; tli, Anáaski) is a state located in the Western United States on the northwest extremity of North America. A semi-exclave of the U.S ...
. Cook Inlet branches into the Knik Arm and
Turnagain Arm Turnagain Arm ( Dena'ina: ''Tutl'uh'') is a waterway into the northwestern part of the Gulf of Alaska. It is one of two narrow branches at the north end of Cook Inlet, the other being Knik Arm. Turnagain is subject to climate extremes and large ...
at its northern end, almost surrounding Anchorage. On its southern end, it merges with
Shelikof Strait Shelikof Strait (russian: Пролив Шелихова) is a strait on the southwestern coast of the U.S. state of Alaska between the Alaska mainland to the west and Kodiak and Afognak islands to the east. Shelikof Strait separates the mainla ...
, Stevenson Entrance, Kennedy Entrance and Chugach Passage. The Cook Inlet watershed is the most populated watershed in Alaska. The
watershed Watershed is a hydrological term, which has been adopted in other fields in a more or less figurative sense. It may refer to: Hydrology * Drainage divide, the line that separates neighbouring drainage basins * Drainage basin, called a "watershe ...
covers about of southern Alaska, east of the Aleutian Range, south and east of the Alaska Range, receiving water from its tributaries, the
Knik River The Knik River ( Dena'ina: ''Skitnu''; Ahtna The Ahtna (also Ahtena, Atna, Ahtna-kohtaene, or Copper River) are an Alaska Native Athabaskan people of the Athabaskan-speaking ethnolinguistic group. The people's homeland called Atna Nen ...
, the Little Susitna River, and the Susitna and Matanuska
river A river is a natural flowing watercourse, usually freshwater Fresh water or freshwater is any naturally occurring liquid or frozen water containing low concentrations of dissolved salts and other total dissolved solids. Although the ...
s. The watershed includes the drainage areas of
Denali Denali (; also known as Mount McKinley, its former official name) is the highest mountain peak in North America, with a summit elevation of above sea level. With a topographic prominence of and a topographic isolation of , Denali is the thi ...
(formerly named Mount McKinley). Within the watershed there are several
national park A national park is a natural park in use for conservation purposes, created and protected by national governments. Often it is a reserve of natural, semi-natural, or developed land that a sovereign state declares or owns. Although individua ...
s and the active volcano Mount Redoubt, along with three other historically active
volcano A volcano is a rupture in the crust of a planetary-mass object, such as Earth, that allows hot lava, volcanic ash, and gases to escape from a magma chamber below the surface. On Earth, volcanoes are most often found where tectonic plates ...
es. Cook Inlet provides navigable access to the
port A port is a maritime facility comprising one or more wharves or loading areas, where ships load and discharge cargo and passengers. Although usually situated on a sea coast or estuary, ports can also be found far inland, such as ...
of
Anchorage Anchorage () is the largest city in the U.S. state of Alaska by population. With a population of 291,247 in 2020, it contains nearly 40% of the state's population. The Anchorage metropolitan area, which includes Anchorage and the neighboring ...
at the northern end, and to the smaller
Homer Homer (; grc, Ὅμηρος , ''Hómēros'') (born ) was a Greek poet who is credited as the author of the '' Iliad'' and the '' Odyssey'', two epic poems that are foundational works of ancient Greek literature. Homer is considered one of ...
port further south. Before the growth of Anchorage, Knik was the destination for most marine traffic in upper Cook Inlet. Approximately 400,000 people live within the Cook Inlet watershed.


Geography

The Cook Inlet region contains active volcanoes, including Augustine Volcano and Mount Redoubt. Volcanic eruptions in the region have been associated with
earthquake An earthquake (also known as a quake, tremor or temblor) is the shaking of the surface of the Earth resulting from a sudden release of energy in the Earth's lithosphere that creates seismic waves. Earthquakes can range in intensity, from ...
s and
tsunami A tsunami ( ; from ja, 津波, lit=harbour wave, ) is a series of waves in a water body caused by the displacement of a large volume of water, generally in an ocean or a large lake. Earthquakes, volcanic eruptions and other underwater exp ...
s, and debris
avalanche An avalanche is a rapid flow of snow down a slope, such as a hill or mountain. Avalanches can be set off spontaneously, by such factors as increased precipitation or snowpack weakening, or by external means such as humans, animals, and ear ...
s have resulted in tsunamis also. There was an earthquake of the magnitude of 7.1 on December 31, 1901 generated by an eruption that caused several tsunamis. In 2009 a
lahar A lahar (, from jv, ꦮ꧀ꦭꦲꦂ) is a violent type of mudflow or debris flow composed of a slurry of pyroclastic material, rocky debris and water. The material flows down from a volcano, typically along a river valley. Lahars are extreme ...
from Mt. Redoubt threatened the
Drift River oil terminal The Drift River Terminal Facility, also known as the Drift River Oil Terminal, is a tank farm which holds crude oil before it is loaded onto oil tankers and transported to refineries. It is located in Alaska along Cook Inlet, at the terminus of the ...
.


History

The inlet was first explored and settled by Dena'ina people. In the 18th century, Russian fur hunters ''(
promyshlenniki The ''promyshlenniki'' (russian: промышленники, singular form: russian: промышленник, translit=promyshlennik), were Russian and indigenous Siberian artel- or self-employed workers drawn largely from the state serf and ...
)'' were among the first European visitors. The Lebedev Lastochkin Company leader Stepan Zaikov established a post at the mouth of the Kenai River, Fort Nikolaev, in 1786. These fur trappers used Siberian Native and Alaska Native people, particularly
Aleut The Aleuts ( ; russian: Алеуты, Aleuty) are the indigenous people of the Aleutian Islands, which are located between the North Pacific Ocean and the Bering Sea. Both the Aleut people and the islands are politically divided between the U ...
s from the
Aleutian Islands The Aleutian Islands ( ; ; ale, Unangam Tanangin, "land of the Aleuts"; possibly from the Chukchi ''aliat'', or "island")—also called the Aleut Islands, Aleutic Islands, or, before 1867, the Catherine Archipelago—are a chain of 14 main, ...
and Koniag natives from Kodiak, to hunt for
sea otter The sea otter (''Enhydra lutris'') is a marine mammal native to the coasts of the northern and eastern North Pacific Ocean. Adult sea otters typically weigh between , making them the heaviest members of the weasel family, but among the sma ...
s and other marine mammal species for trade with China via Russia's then-exclusive inland port of trade at Kiakhta. Other
Europe Europe is a large peninsula conventionally considered a continent in its own right because of its great physical size and the weight of its history and traditions. Europe is also considered a subcontinent of Eurasia and it is located enti ...
ans to visit Cook Inlet include the 1778 expedition of James Cook, its namesake, who sailed into it while searching for the
Northwest Passage The Northwest Passage (NWP) is the sea route between the Atlantic and Pacific oceans through the Arctic Ocean, along the northern coast of North America via waterways through the Canadian Arctic Archipelago. The eastern route along the Arct ...
. Cook received maps of Alaska, the Aleutians, and Kamchatka during a visit with Russian fur trader Gerasim Izmailov in Unalaska, and combined these maps with those of his expedition to create the first
Mercator projection The Mercator projection () is a cylindrical map projection presented by Flemish geographer and cartographer Gerardus Mercator in 1569. It became the standard map projection for navigation because it is unique in representing north as up and so ...
of the North Pacific. The inlet was named after Cook in 1794 by
George Vancouver Post-captain, Captain George Vancouver (22 June 1757 – 10 May 1798) was a British Royal Navy officer best known for his Vancouver Expedition, 1791–1795 expedition, which explored and charted North America's northwestern West Coast of the Un ...
, who had served under Cook in 1778.
Turnagain Arm Turnagain Arm ( Dena'ina: ''Tutl'uh'') is a waterway into the northwestern part of the Gulf of Alaska. It is one of two narrow branches at the north end of Cook Inlet, the other being Knik Arm. Turnagain is subject to climate extremes and large ...
was named by
William Bligh Vice-Admiral William Bligh (9 September 1754 – 7 December 1817) was an officer of the Royal Navy and a colonial administrator. The mutiny on the HMS ''Bounty'' occurred in 1789 when the ship was under his command; after being set adrift i ...
of HMS ''Bounty'' fame. Bligh served as Cook's Sailing Master on his 3rd and final voyage, the aim of which was discovery of the
Northwest Passage The Northwest Passage (NWP) is the sea route between the Atlantic and Pacific oceans through the Arctic Ocean, along the northern coast of North America via waterways through the Canadian Arctic Archipelago. The eastern route along the Arct ...
. Upon reaching the head of Cook Inlet, Bligh was of the opinion that both Knik Arm and Turnagain Arm were the mouths of rivers and not the opening to the Northwest Passage. Under Cook's orders Bligh organized a party to travel up Knik Arm, which quickly returned to report Knik Arm indeed led only to a river. Afterwards a second party was dispatched up Turnagain Arm and it too returned to report only a river lay ahead. As a result of this frustration the second body of water was given the disingenuous name "Turn Again". Early maps label Turnagain Arm as the "Turnagain River". The S.S. ''Farallon'' was a wooden Alaskan Steamship Company liner that
struck Struck is a surname. Notable people with the surname include: *Adolf Struck (1877–1911), German author *Hermann Struck (1876–1944), German artist *Karin Struck (1947–2006), German author *Paul Struck (1776-1820), German composer *Peter Struc ...
Black Reef in the Cook Inlet on January 5, 1910. All thirty-eight men on board survived, and were rescued twenty-nine days later. Few white people visited upper Cook Inlet until construction of the
Alaska Railroad Alaska ( ; russian: Аляска, Alyaska; ale, Alax̂sxax̂; ; ems, Alas'kaaq; Yup'ik: ''Alaskaq''; tli, Anáaski) is a state located in the Western United States on the northwest extremity of North America. A semi-exclave of the U.S. ...
along the eastern shores of Turnagain Arm and Knik Arm of Cook Inlet around 1915. The natives of the
Eklutna Eklutna (; Dena'ina: ''Idlughet''; Ahtna: ''Zdlaaygha'') is a native village within the Municipality of Anchorage in the U.S. state of Alaska. The Tribal Council estimates the population at 70; many tribal members live in the surrounding communiti ...
village are the descendants of the residents of eight native villages around upper Cook Inlet. During the
1964 Alaska earthquake The 1964 Alaskan earthquake, also known as the Great Alaskan earthquake and Good Friday earthquake, occurred at 5:36 PM AKST on Good Friday, March 27.
, areas around the head of Turnagain Arm near Girdwood and Portage dropped as much as by subsidence and subsequent tidal action. Both hamlets were destroyed. Girdwood was later relocated inland and Portage was abandoned. About of the Seward Highway sank below the high-water mark of Turnagain Arm; the highway and its bridges were raised and rebuilt in 1964–66.


Communities

Most of Alaska's population is in the Cook Inlet area, with highest concentration in
Anchorage, Alaska Anchorage () is the largest city in the U.S. state of Alaska by population. With a population of 291,247 in 2020, it contains nearly 40% of the state's population. The Anchorage metropolitan area, which includes Anchorage and the neighboring ...
. Along the East side of the Cook Inlet, the
Kenai Peninsula The Kenai Peninsula ( Dena'ina: ''Yaghenen'') is a large peninsula jutting from the coast of Southcentral Alaska. The name Kenai (, ) is derived from the word "Kenaitze" or "Kenaitze Indian Tribe", the name of the Native Athabascan Alaskan trib ...
is host to many smaller fishing communities, such as Kenai, Soldotna, Ninilchick, Anchor Point and Homer. Many residents of the Kenai rely on income generated from fisheries in the Cook Inlet. The west side of the Inlet is not connected to any major road systems and is typically accessed by boat or plane. Here you can find the village of Tyonek, Alaska, some oil camps, and many seasonal fishing camps.


Resources

The Cook Inlet Basin contains large oil and gas deposits including several offshore fields. As of 2005 there were 16 platforms in Cook Inlet, the oldest of which is the ''XTO A'' platform first installed by Shell in 1964, and newest of which is the ''Osprey'' platform installed by Forest Oil in 2000. Most of the platforms are operated by Union Oil, which was acquired by Chevron in 2005. There are also numerous oil and gas pipelines running around and under the Cook Inlet. The main destinations of the gas pipelines are to Kenai where the gas is primarily used to fuel commercial fertilizer production and a liquified natural gas (LNG) plant and to Anchorage where the gas is consumed largely for domestic uses. Alaska has approximately half the known coal reserves in the U.S. For decades, there has been a proposal to build a large coal mine (the Chuitna Coal Mine) on the west side of Cook Inlet near the Chuitna River, and the native village of Tyonek, Alaska.
American Rivers American(s) may refer to: * American, something of, from, or related to the United States of America, commonly known as the "United States" or "America" ** Americans, citizens and nationals of the United States of America ** American ancestry, pe ...
has placed the Chuitna River on its list of the 10 most endangered rivers for 2007, based on the threat of this mine. Turnagain Arm is one of only about 60 bodies of water worldwide to exhibit a
tidal bore Tidal is the adjectival form of tide. Tidal may also refer to: * ''Tidal'' (album), a 1996 album by Fiona Apple * Tidal (king), a king involved in the Battle of the Vale of Siddim * TidalCycles, a live coding environment for music * Tidal (servic ...
. The bore may be more than six feet high and travel at 15 miles per hour on high
spring tide Tides are the rise and fall of sea levels caused by the combined effects of the gravitational forces exerted by the Moon (and to a much lesser extent, the Sun) and are also caused by the Earth and Moon orbiting one another. Tide tables ...
s and opposing winds. Turnagain Arm sees the largest
tidal range Tidal range is the difference in height between high tide and low tide. Tides are the rise and fall of sea levels caused by gravitational forces exerted by the Moon and Sun and the rotation of Earth. Tidal range depends on time and location. ...
in United States, with a mean of 30 feet (9.2 m), and the fourth highest in the world, behind
Bay of Fundy The Bay of Fundy (french: Baie de Fundy) is a bay between the Canadian provinces of New Brunswick and Nova Scotia, with a small portion touching the U.S. state of Maine. It is an arm of the Gulf of Maine. Its extremely high tidal range is th ...
(11.7m), Ungava Bay (9.75m), and
Bristol Channel The Bristol Channel ( cy, Môr Hafren, literal translation: "Severn Sea") is a major inlet in the island of Great Britain, separating South Wales from Devon and Somerset in South West England. It extends from the lower estuary of the River S ...
(9.6m). The ocean's natural 12-hour 25-minute tidal cycle is close to Turnagain Arm's natural resonance frequency, which then reinforces the tide similar to water sloshing in a bathtub. Tidal fluctuations in the main body of Cook Inlet, while not as extreme as the shallow and narrow Turnagain Arm, regularly reach or more and exhibit currents in excess of at full tidal flow. The inlet and its arms have been proposed as a potentially attractive site for the generation of
tidal power Tidal power or tidal energy is harnessed by converting energy from tides into useful forms of power, mainly electricity using various methods. Although not yet widely used, tidal energy has the potential for future electricity generation. T ...
. Turnagain Arm and Knik Arm are known for large areas of
silt Silt is granular material of a size between sand and clay and composed mostly of broken grains of quartz. Silt may occur as a soil (often mixed with sand or clay) or as sediment mixed in suspension with water. Silt usually has a floury feel wh ...
. At low tide, much of this is exposed, making marine navigation difficult. Historically, ships and boats designed for the area had a relatively flat bottom with a modest centerboard and absence of a large keel because the boats would occasionally become beached at low tide either on purpose or by accident. This design allowed the craft to support its weight on land without sustaining any serious damage to its structure. An example of this design is the Nomad, a much photographed fishing boat once owned by Joe Reddington which has sat on a mudflat near Knik for several decades. These
mudflats Mudflats or mud flats, also known as tidal flats or, in Ireland, slob or slobs, are coastal wetlands that form in intertidal areas where sediments have been deposited by tides or rivers. A global analysis published in 2019 suggested that tidal f ...
can also be dangerous to walk on, exhibiting
quicksand Quicksand is a colloid consisting of fine granular material (such as sand, silt or clay) and water. It forms in saturated loose sand when the sand is suddenly agitated. When water in the sand cannot escape, it creates a liquefied soil that los ...
-like characteristics, and have claimed the life of at least two people who have wandered out on them.
Cruise ships Cruise ships are large passenger ships used mainly for vacationing. Unlike ocean liners, which are used for transport, cruise ships typically embark on round-trip voyages to various ports-of-call, where passengers may go on Tourism, tours know ...
dock at Seward on the Gulf of Alaska or Whittier in
Prince William Sound Prince William Sound ( Sugpiaq: ''Suungaaciq'') is a sound of the Gulf of Alaska on the south coast of the U.S. state of Alaska. It is located on the east side of the Kenai Peninsula. Its largest port is Valdez, at the southern terminus of the ...
and transport passengers via bus or train to Anchorage. However, over 95% of freight entering Alaska comes through the
Port of Anchorage The Port of Alaska (POA) is a deep-water port located in Anchorage, Alaska with 3 bulk carrier berths, two petroleum berths, and one barge berth. It is an enterprise department of the Municipality of Anchorage. The name was changed from "Port of ...
, which is served by major
container ship A container ship (also called boxship or spelled containership) is a cargo ship that carries all of its load in truck-size intermodal containers, in a technique called containerization. Container ships are a common means of commercial intermoda ...
companies and other carriers.


Conservation

The Cook Inlet
beluga whale The beluga whale () (''Delphinapterus leucas'') is an Arctic and sub-Arctic cetacean. It is one of two members of the family Monodontidae, along with the narwhal, and the only member of the genus ''Delphinapterus''. It is also known as the whi ...
is a genetically distinct and geographically isolated stock. The population fell to 278 in 2005 and it is listed as critically endangered in the
IUCN Red List The International Union for Conservation of Nature (IUCN) Red List of Threatened Species, also known as the IUCN Red List or Red Data Book, founded in 1964, is the world's most comprehensive inventory of the global conservation status of biol ...
of Threatened Species. This was perhaps due to local hunt, although a recent article in the
Anchorage Daily News The ''Anchorage Daily News'' is a daily newspaper published by the Binkley Co., and based in Anchorage, Alaska. It is the most widely read newspaper and news website (adn.com) in the state of Alaska. The newspaper is headquartered in Anchorage, ...
questioned this conclusion. In 2000, the US
National Marine Fisheries Service The National Marine Fisheries Service (NMFS), informally known as NOAA Fisheries, is a United States federal agency within the U.S. Department of Commerce's National Oceanic and Atmospheric Administration (NOAA) that is responsible for the ste ...
listed the Cook Inlet beluga whale population as depleted and began development of a conservation plan. On October 22, 2008 the Cook Inlet beluga whale was put onto the endangered species list. Cook Inlet activities include commercial fishing, oil and gas development, release of treated sewage, noise from aircraft and ships, shipping traffic, and tourism. However, it is not known what impact these activities had on the beluga whale population. The Coastal Marine Institute at the
University of Alaska Fairbanks The University of Alaska Fairbanks (UAF or Alaska) is a public land-grant research university in College, Alaska, a suburb of Fairbanks. It is the flagship campus of the University of Alaska system. UAF was established in 1917 and opened for ...
's School of Fisheries and Ocean Sciences working with the U.S. Department of the Interior's Minerals Management Service (MMS), began a three-year project in 2003 focusing on the water circulation in Cook Inlet.
Cook Inletkeeper Cook Inletkeeper is a non-profit water conservation and ecology organization based in Homer, Alaska. Their stated goal is "''promoting sound public policies that protect fish habitat and water quality; and holding individuals, industry and agenc ...
, a member of the
Waterkeeper Alliance Waterkeeper Alliance is a worldwide network of environmental organizations founded in 1999 in response to a growing movement of organizations with such names as Riverkeeper, Baykeeper and Soundkeeper. By December 2019, the group said it had gro ...
, began in 1994 when a group of Alaskans became concerned about the rapid ecological changes in the inlet. The group formally incorporated the following year using settlement proceeds from a Clean Water Act lawsuit against Cook Inlet oil and gas producers. Their stated mission is to "protect Alaska's Cook Inlet watershed and the life it sustains," with a focus on clean water, healthy habitat, local economies, and energy. They are based in
Homer Homer (; grc, Ὅμηρος , ''Hómēros'') (born ) was a Greek poet who is credited as the author of the '' Iliad'' and the '' Odyssey'', two epic poems that are foundational works of ancient Greek literature. Homer is considered one of ...
.


See also

* Alaska Wildlife Conservation Center * Augustine Volcano * Kalgin Island *
Knik Arm Bridge The Knik Arm Bridge is a dormant proposal for a bridge across Cook Inlet's Knik Arm to link the two fastest growing parts of Alaska – Anchorage and the Matanuska-Susitna Borough. The project consists of a bridge with of connector roads, ...
*
Lake Clark National Park Lake Clark National Park and Preserve is an American national park in southwest Alaska, about southwest of Anchorage. The park was first proclaimed a national monument in 1978, then established as a national park and preserve in 1980 by the A ...
* Captain Cook State Recreation Area


Notes


External links


United States, Alaska South Coast, Barren Islands
National Ocean Service The National Ocean Service (NOS) is an office within the U.S. Department of Commerce National Oceanic and Atmospheric Administration (NOAA). It is responsible for preserving and enhancing the nation's coastal resources and ecosystems along the o ...

United States, Alaska South Coast, Cook Inlet, Anchor Point to Kalgin Island
National Ocean Service The National Ocean Service (NOS) is an office within the U.S. Department of Commerce National Oceanic and Atmospheric Administration (NOAA). It is responsible for preserving and enhancing the nation's coastal resources and ecosystems along the o ...

Map of Cook Inlet oil and gas activity
Alaska Department of Natural Resources {{Authority control Estuaries of Alaska Bodies of water of Anchorage, Alaska Bodies of water of Kenai Peninsula Borough, Alaska Bodies of water of Matanuska-Susitna Borough, Alaska Kenai Mountains-Turnagain Arm National Heritage Area Monuments and memorials to James Cook