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The Panama Canal ( es, Canal de Panamá, link=no) is an artificial waterway in
Panama Panama ( , ; es, link=no, Panamá ), officially the Republic of Panama ( es, República de Panamá), is a transcontinental country spanning the southern part of North America and the northern part of South America. It is bordered by Cos ...
that connects the
Atlantic Ocean The Atlantic Ocean is the second-largest of the world's five oceans, with an area of about . It covers approximately 20% of Earth's surface and about 29% of its water surface area. It is known to separate the " Old World" of Africa, Europe ...
with the
Pacific Ocean The Pacific Ocean is the largest and deepest of Earth's five oceanic divisions. It extends from the Arctic Ocean in the north to the Southern Ocean (or, depending on definition, to Antarctica) in the south, and is bounded by the continen ...
and divides North and South America. The canal cuts across the
Isthmus of Panama The Isthmus of Panama ( es, Istmo de Panamá), also historically known as the Isthmus of Darien (), is the narrow strip of land that lies between the Caribbean Sea and the Pacific Ocean, linking North and South America. It contains the country ...
and is a
conduit Conduit may refer to: Engineering systems * Conduit (fluid conveyance), a pipe suitable for carrying either open-channel or pressurized liquids * Electrical conduit, a protective cover, tube or piping system for electric cables * Conduit curre ...
for maritime trade. One of the largest and most difficult engineering projects ever undertaken, the Panama Canal shortcut greatly reduces the time for ships to travel between the Atlantic and Pacific oceans, enabling them to avoid the lengthy, hazardous
Cape Horn Cape Horn ( es, Cabo de Hornos, ) is the southernmost headland of the Tierra del Fuego archipelago of southern Chile, and is located on the small Hornos Island. Although not the most southerly point of South America (which are the Diego Ramírez ...
route around the southernmost tip of South America via the
Drake Passage The Drake Passage (referred to as Mar de Hoces Hoces Sea"in Spanish-speaking countries) is the body of water between South America's Cape Horn, Chile and the South Shetland Islands of Antarctica. It connects the southwestern part of the Atla ...
or
Strait of Magellan The Strait of Magellan (), also called the Straits of Magellan, is a navigable sea route in southern Chile separating mainland South America to the north and Tierra del Fuego to the south. The strait is considered the most important natural pass ...
and the even less popular route through the
Arctic Archipelago The Arctic Archipelago, also known as the Canadian Arctic Archipelago, is an archipelago lying to the north of the Canadian continental mainland, excluding Greenland (an autonomous territory of Denmark). Situated in the northern extremity of No ...
and the Bering Strait.
Colombia Colombia (, ; ), officially the Republic of Colombia, is a country in South America with insular regions in North America—near Nicaragua's Caribbean coast—as well as in the Pacific Ocean. The Colombian mainland is bordered by the Car ...
, France, and later the United States controlled the territory surrounding the canal during construction. France began work on the canal in 1881, but stopped because of lack of investors' confidence due to engineering problems and a high worker
mortality rate Mortality rate, or death rate, is a measure of the number of deaths (in general, or due to a specific cause) in a particular population, scaled to the size of that population, per unit of time. Mortality rate is typically expressed in units of de ...
. The United States took over the project on May 4, 1904, and opened the canal on August 15, 1914. The US continued to control the canal and surrounding
Panama Canal Zone The Panama Canal Zone ( es, Zona del Canal de Panamá), also simply known as the Canal Zone, was an unincorporated territory of the United States, located in the Isthmus of Panama, that existed from 1903 to 1979. It was located within the terr ...
until the 1977
Torrijos–Carter Treaties The Torrijos–Carter Treaties ( es, link=no, Tratados Torrijos-Carter) are two treaties signed by the United States and Panama in Washington, D.C. on September 7, 1977, which superseded the Hay–Bunau-Varilla Treaty of 1903. The treaties guara ...
provided for handover to Panama. After a period of joint American–Panamanian control, the canal was taken over by the Panamanian government in 1999. It is now managed and operated by the government-owned
Panama Canal Authority The Panama Canal Authority ( es, Autoridad del Canal de Panamá (ACP)) is the agency of the government of Panama responsible for the operation and management of the Panama Canal. The ACP took over the administration of the canal from the Panama ...
.
Canal lock A lock is a device used for raising and lowering boats, ships and other watercraft between stretches of water of different levels on river and canal waterways. The distinguishing feature of a lock is a fixed chamber in which the water lev ...
s at each end lift ships up to
Gatun Lake Gatun Lake ( es, Lago Gatún) is a large freshwater artificial lake to the south of Colón, Panama. At approximately above sea level, it forms a major part of the Panama Canal, carrying ships of their transit across the Isthmus of Panama. Gatun ...
, an artificial lake created to reduce the amount of excavation work required for the canal,
above sea level Height above mean sea level is a measure of the vertical distance (height, elevation or altitude) of a location in reference to a historic mean sea level taken as a vertical datum. In geodesy, it is formalized as ''orthometric heights''. The comb ...
, and then lower the ships at the other end. The original locks are wide. A third, wider lane of locks was constructed between September 2007 and May 2016. The expanded waterway began commercial operation on June 26, 2016. The new locks allow transit of larger, New Panamax ships. Annual traffic has risen from about 1,000 ships in 1914, when the canal opened, to 14,702 vessels in 2008, for a total of 333.7 million Panama Canal/Universal Measurement System (PC/UMS) tons. By 2012, more than 815,000 vessels had passed through the canal. In 2017 it took ships an average of 11.38 hours to pass between the canal's two locks. The
American Society of Civil Engineers 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 ranked the Panama Canal one of the
seven wonders of the modern world Various lists of the Wonders of the World have been compiled from antiquity to the present day, in order to catalogue the world's most spectacular natural features and human-built structures. The Seven Wonders of the Ancient World is the o ...
.


History


Early proposals in Panama

The earliest record regarding a canal across the Isthmus of Panama was in 1534, when
Charles V Charles V may refer to: * Charles V, Holy Roman Emperor (1500–1558) * Charles V of Naples (1661–1700), better known as Charles II of Spain * Charles V of France (1338–1380), called the Wise * Charles V, Duke of Lorraine (1643–1690) * Infan ...
,
Holy Roman Emperor The Holy Roman Emperor, originally and officially the Emperor of the Romans ( la, Imperator Romanorum, german: Kaiser der Römer) during the Middle Ages, and also known as the Roman-German Emperor since the early modern period ( la, Imperat ...
and King of Spain, ordered a survey for a route through the Americas in order to ease the voyage for ships traveling between Spain and
Peru , image_flag = Flag of Peru.svg , image_coat = Escudo nacional del Perú.svg , other_symbol = Great Seal of the State , other_symbol_type = Seal (emblem), National seal , national_motto = "Fi ...
. The Spanish were seeking to gain a military advantage over the Portuguese. In 1668, the English physician and philosopher Sir
Thomas Browne Sir Thomas Browne (; 19 October 160519 October 1682) was an English polymath and author of varied works which reveal his wide learning in diverse fields including science and medicine, religion and the esoteric. His writings display a deep curi ...
speculated in his encyclopedic work, ''
Pseudodoxia Epidemica ''Pseudodoxia Epidemica or Enquiries into very many received tenents and commonly presumed truths'', also known simply as ''Pseudodoxia Epidemica'' or ''Vulgar Errors'', is a work by Thomas Browne challenging and refuting the "vulgar" or common ...
,'' that "some Isthmus have been eaten through by the Sea, and others cut by the spade: And if the policy would permit, that of Panama in America were most worthy the attempt: it being but few miles over, and would open a shorter cut unto the East Indies and China". In 1788, American
Thomas Jefferson Thomas Jefferson (April 13, 1743 – July 4, 1826) was an American statesman, diplomat, lawyer, architect, philosopher, and Founding Fathers of the United States, Founding Father who served as the third president of the United States from 18 ...
, then Minister to France, suggested that the Spanish should build the canal, since they controlled the colonies where it would be built. He said that this would be a less treacherous route for ships than going around the southern tip of South America, and that tropical ocean currents would naturally widen the canal after construction. During an expedition from 1788 to 1793,
Alessandro Malaspina Alejandro Malaspina (November 5, 1754 – April 9, 1810) was a Tuscan explorer who spent most of his life as a Spanish naval officer. Under a Spanish royal commission, he undertook a voyage around the world from 1786 to 1788, then, from 1789 t ...
outlined plans for construction of a canal. Given the strategic location of Panama, and the potential of its narrow isthmus separating two great oceans, other trade links in the area were attempted over the years. The ill-fated
Darien scheme The Darien scheme was an unsuccessful attempt, backed largely by investors of the Kingdom of Scotland, to gain wealth and influence by establishing ''New Caledonia'', a colony on the Isthmus of Panama, in the late 1690s. The plan was for the co ...
was launched by the
Kingdom of Scotland The Kingdom of Scotland (; , ) was a sovereign state in northwest Europe traditionally said to have been founded in 843. Its territories expanded and shrank, but it came to occupy the northern third of the island of Great Britain, sharing a la ...
in 1698 to set up an overland trade route. Generally inhospitable conditions thwarted the effort, and it was abandoned in April 1700. Numerous canals were built in other countries in the late 18th and early 19th centuries. The success of the
Erie Canal The Erie Canal is a historic canal in upstate New York that runs east-west between the Hudson River and Lake Erie. Completed in 1825, the canal was the first navigable waterway connecting the Atlantic Ocean to the Great Lakes, vastly reducing t ...
through central
New York New York most commonly refers to: * New York City, the most populous city in the United States, located in the state of New York * New York (state), a state in the northeastern United States New York may also refer to: Film and television * '' ...
in the United States in the 1820s, and the collapse of the
Spanish Empire The Spanish Empire ( es, link=no, Imperio español), also known as the Hispanic Monarchy ( es, link=no, Monarquía Hispánica) or the Catholic Monarchy ( es, link=no, Monarquía Católica) was a colonial empire governed by Spain and its prede ...
in Latin America resulted in growing American interest in building an inter-oceanic canal. Beginning in 1826, US officials began negotiations with
Gran Colombia Gran Colombia (, "Great Colombia"), or Greater Colombia, officially the Republic of Colombia (Spanish: ''República de Colombia''), was a state that encompassed much of northern South America and part of southern Central America from 1819 to 18 ...
(present-day
Colombia Colombia (, ; ), officially the Republic of Colombia, is a country in South America with insular regions in North America—near Nicaragua's Caribbean coast—as well as in the Pacific Ocean. The Colombian mainland is bordered by the Car ...
,
Venezuela Venezuela (; ), officially the Bolivarian Republic of Venezuela ( es, link=no, República Bolivariana de Venezuela), is a country on the northern coast of South America, consisting of a continental landmass and many islands and islets in th ...
,
Ecuador Ecuador ( ; ; Quechua: ''Ikwayur''; Shuar: ''Ecuador'' or ''Ekuatur''), officially the Republic of Ecuador ( es, República del Ecuador, which literally translates as "Republic of the Equator"; Quechua: ''Ikwadur Ripuwlika''; Shuar: ''Eku ...
, and Panama), hoping to gain a concession to build a canal. Jealous of their newly gained independence and fearing domination by the more powerful United States, president
Simón Bolívar Simón José Antonio de la Santísima Trinidad Bolívar y Palacios (24 July 1783 – 17 December 1830) was a Venezuelan military and political leader who led what are currently the countries of Colombia, Venezuela, Ecuador, Peru, Panama and B ...
and New Granada officials declined American offers. After the collapse of Gran Colombia, New Granada remained unstable under constant government intrigue. Great Britain attempted to develop a canal in 1843. According to the ''
New-York Daily Tribune The ''New-York Tribune'' was an American newspaper founded in 1841 by editor Horace Greeley. It bore the moniker ''New-York Daily Tribune'' from 1842 to 1866 before returning to its original name. From the 1840s through the 1860s it was the dom ...
'', August 24, 1843,
Barings Bank Barings Bank was a British merchant bank based in London, and one of England's List of oldest banks in continuous operation, oldest merchant banks after Berenberg Bank, Barings' close collaborator and German representative. It was founded in 1762 ...
of London and the
Republic of New Granada The Republic of New Granada was a 1831–1858 centralist unitary republic consisting primarily of present-day Colombia and Panama with smaller portions of today's Costa Rica, Ecuador, Venezuela, Peru and Brazil. On 9 May 1834, the national flag wa ...
entered into a contract for the construction of a canal across the
Isthmus of Darien An isthmus (; ; ) is a narrow piece of land connecting two larger areas across an expanse of water by which they are otherwise separated. A tombolo is an isthmus that consists of a spit or bar, and a strait is the sea counterpart of an isthmus ...
(Isthmus of Panama). They referred to it as the Atlantic and Pacific Canal, and it was a wholly British endeavor. Projected for completion in five years, the plan was never carried out. At nearly the same time, other ideas were floated, including a canal (and/or a railroad) across Mexico's
Isthmus of Tehuantepec The Isthmus of Tehuantepec () is an isthmus in Mexico. It represents the shortest distance between the Gulf of Mexico and the Pacific Ocean. Before the opening of the Panama Canal, it was a major overland transport route known simply as the Te ...
. That did not develop, either. In 1846, the
Mallarino–Bidlack Treaty The Mallarino–Bidlack Treaty (also known as the Bidlack Treaty and Treaty of New Granada) was a treaty signed between New Granada (today Colombia and Panama) and the United States, on December 12, 1846.Kellogg Institute at the University of Not ...
, negotiated between the US and New Granada, granted the United States transit rights and the right to intervene militarily in the isthmus. In 1848, the discovery of gold in California, on the West Coast of the United States, generated renewed interest in a canal crossing between the Atlantic and Pacific oceans. William H. Aspinwall, who had won the federal subsidy to build and operate the Pacific mail steamships at around the same time, benefited from the gold discovery. Aspinwall's route included steamship legs from New York City to Panama, and from Panama to California, with an overland portage through Panama. This route with an overland leg in Panama was soon frequently traveled, as it provided one of the fastest connections between San Francisco, California, and the
East Coast East Coast may refer to: Entertainment * East Coast hip hop, a subgenre of hip hop * East Coast (ASAP Ferg song), "East Coast" (ASAP Ferg song), 2017 * East Coast (Saves the Day song), "East Coast" (Saves the Day song), 2004 * East Coast FM, a ra ...
cities, about 40 days' transit in total. Nearly all the gold that was shipped out of California went by the fast Panama route. Several new and larger paddle steamers were soon plying this new route, including private steamship lines owned by American entrepreneur
Cornelius Vanderbilt Cornelius Vanderbilt (May 27, 1794 – January 4, 1877), nicknamed "the Commodore", was an American business magnate who built his wealth in railroads and shipping. After working with his father's business, Vanderbilt worked his way into lead ...
that made use of an overland route through
Nicaragua Nicaragua (; ), officially the Republic of Nicaragua (), is the largest country in Central America, bordered by Honduras to the north, the Caribbean to the east, Costa Rica to the south, and the Pacific Ocean to the west. Managua is the cou ...
, and the unfortunate SS Central America. In 1850 the United States began construction of the
Panama Railroad The Panama Canal Railway ( es, Ferrocarril de Panamá) is a railway line linking the Atlantic Ocean to the Pacific Ocean in Central America. The route stretches across the Isthmus of Panama from Colón (Atlantic) to Balboa (Pacific, near P ...
(now called the Panama Railway) to cross the isthmus; it opened in 1855. This overland link became a vital piece of Western Hemisphere infrastructure, greatly facilitating trade. The later canal route was constructed parallel to it, as it had helped clear dense forests. An all-water route between the oceans was still the goal. In 1855
William Kennish William Kennish (1799 – March 19, 1862) was an engineer, inventor, explorer, scientist, and poet, known primarily for inventions developed while he served in the British Royal Navy (1821–1841). They ranged from improvements for artillery to nav ...
, a Manx-born engineer working for the United States government, surveyed the isthmus and issued a report on a route for a proposed Panama Canal. His report was published as a book entitled ''The Practicability and Importance of a Ship Canal to Connect the Atlantic and Pacific Oceans''. In 1876, Lucien Napoléon Bonaparte Wyse and his chief assistant Armand Réclus, both officers and engineers of the
French Navy The French Navy (french: Marine nationale, lit=National Navy), informally , is the maritime arm of the French Armed Forces and one of the five military service branches of France. It is among the largest and most powerful naval forces in t ...
, explored several routes in the Darien-Atrato regions, and made proposals including the construction of tunnels and locks. A second Isthmian exploratory visit began on December 6, 1877, where two routes were explored in Panama, the San Blas route and a route from Limon Bay to Panama City, the current Canal route. The French had achieved success in building the
Suez Canal The Suez Canal ( arz, قَنَاةُ ٱلسُّوَيْسِ, ') is an artificial sea-level waterway in Egypt, connecting the Mediterranean Sea to the Red Sea through the Isthmus of Suez and dividing Africa and Asia. The long canal is a popular ...
in the Middle East. While it was a lengthy project, they were encouraged to plan for a canal to cross the Panamanian isthmus. Wyse went to Bogotá and on March 20, 1878, signed a treaty, in the name of the ''Société Civile Internationale du Canal Interocéanique par l'isthme du Darien'' headed by general Étienne Türr, with the Colombian government, known as the Wyse concession, to build an interoceanic canal through Panama.


French construction attempts, 1881–1899

The first attempt to construct a canal through what was then
Colombia Colombia (, ; ), officially the Republic of Colombia, is a country in South America with insular regions in North America—near Nicaragua's Caribbean coast—as well as in the Pacific Ocean. The Colombian mainland is bordered by the Car ...
's province of Panama began on January 1, 1881. The project was inspired by the diplomat
Ferdinand de Lesseps Ferdinand Marie, Comte de Lesseps (; 19 November 1805 – 7 December 1894) was a French diplomat and later developer of the Suez Canal, which in 1869 joined the Mediterranean and Red Seas, substantially reducing sailing distances and times ...
, who was able to raise considerable funds in
France France (), officially the French Republic ( ), is a country primarily located in Western Europe. It also comprises of Overseas France, overseas regions and territories in the Americas and the Atlantic Ocean, Atlantic, Pacific Ocean, Pac ...
as a result of the huge profits generated by his successful construction of the
Suez Canal The Suez Canal ( arz, قَنَاةُ ٱلسُّوَيْسِ, ') is an artificial sea-level waterway in Egypt, connecting the Mediterranean Sea to the Red Sea through the Isthmus of Suez and dividing Africa and Asia. The long canal is a popular ...
. Although the Panama Canal needed to be only 40 percent as long as the Suez Canal, it was much more of an engineering challenge due to the combination of tropical rain forests, debilitating climate, the need for canal locks, and the lack of any ancient route to follow. Lesseps wanted a sea-level canal (like the Suez), but he visited the site only a few times, during the dry season which lasts only four months of the year. His men were totally unprepared for the rainy season, during which the Chagres River, where the canal started, became a raging torrent, rising up to . The dense jungle was alive with venomous snakes, insects, and spiders, but the worst challenges were
yellow fever Yellow fever is a viral disease of typically short duration. In most cases, symptoms include fever, chills, loss of appetite, nausea, muscle pains – particularly in the back – and headaches. Symptoms typically improve within five days. In ...
,
malaria Malaria is a mosquito-borne infectious disease that affects humans and other animals. Malaria causes symptoms that typically include fever, tiredness, vomiting, and headaches. In severe cases, it can cause jaundice, seizures, coma, or death. S ...
, and other tropical diseases, which killed thousands of workers; by 1884, the death rate was over 200 per month. Public health measures were ineffective because the role of the
mosquito Mosquitoes (or mosquitos) are members of a group of almost 3,600 species of small flies within the family Culicidae (from the Latin ''culex'' meaning " gnat"). The word "mosquito" (formed by ''mosca'' and diminutive ''-ito'') is Spanish for "li ...
as a
disease vector In epidemiology, a disease vector is any living agent that carries and transmits an infectious pathogen to another living organism; agents regarded as vectors are organisms, such as parasites or microbes. The first major discovery of a disease vec ...
was then unknown. Conditions were downplayed in France to avoid recruitment problems, but the high mortality rate made it difficult to maintain an experienced workforce. Workers had to continually widen the main cut through the mountain at Culebra and reduce the angles of the slopes to minimize landslides into the canal.
Steam shovel A steam shovel is a large steam-powered excavating machine designed for lifting and moving material such as rock and soil. It is the earliest type of power shovel or excavator. Steam shovels played a major role in public works in the 19th and e ...
s were used in the construction of the canal, purchased from Bay City Industrial Works, a business owned by William L. Clements in
Bay City, Michigan Bay City is a city and county seat of Bay County in the U.S. state of Michigan, located near the base of the Saginaw Bay on Lake Huron. As of the 2010 census, the city's population was 34,932, and it is the principal city of the Bay City Metropol ...
. Bucket chain excavators manufactured by both Alphonse Couvreux and Wehyer & Richemond and Buette were also used. Other mechanical and electrical equipment was limited in capabilities, and steel equipment rusted rapidly in the rainy climate. In France, Lesseps kept the investment and supply of workers flowing long after it was obvious that the targets were not being met, but eventually the money ran out. The French effort went bankrupt in 1889 after reportedly spending US$287,000,000; an estimated 22,000 men died from disease and accidents, and the savings of 800,000 investors were lost. Work was suspended on May 15, and in the ensuing scandal, known as the Panama affair, some of those deemed responsible were prosecuted, including
Gustave Eiffel Alexandre Gustave Eiffel (born Bonickhausen dit Eiffel; ; ; 15 December 1832 – 27 December 1923) was a French civil engineer. A graduate of École Centrale des Arts et Manufactures, he made his name with various bridges for the French railway ...
. Lesseps and his son Charles were found guilty of misappropriation of funds and sentenced to five years' imprisonment. This sentence was later overturned, and the father, at age 88, was never imprisoned. In 1894, a second French company, the Compagnie Nouvelle du Canal de Panama, was created to take over the project. A minimal workforce of a few thousand people was employed primarily to comply with the terms of the Colombian Panama Canal concession, to run the
Panama Railroad The Panama Canal Railway ( es, Ferrocarril de Panamá) is a railway line linking the Atlantic Ocean to the Pacific Ocean in Central America. The route stretches across the Isthmus of Panama from Colón (Atlantic) to Balboa (Pacific, near P ...
, and to maintain the existing excavation and equipment in salable condition. The company sought a buyer for these assets, with an asking price of US$109,000,000. In the meantime, they continued with enough activity to maintain their franchise. Phillipe Bunau-Varilla, the French manager of the New Panama Canal Company, eventually managed to persuade Lesseps that a lock-and-lake canal was more realistic than a sea-level canal.The Comité Technique, a high level technical committee, was formed by the Compagnie Nouvelle to review the studies and work—that already finished and that still ongoing—and come up with the best plan for completing the canal. The committee arrived on the Isthmus in February 1896 and went immediately, quietly and efficiently about their work of devising the best possible canal plan, which they presented on November 16, 1898. Many aspects of the plan were similar in principle to the canal that was finally built by the Americans in 1914. It was a lock canal with two high level lakes to lift ships up and over the Continental Divide. Double locks would be 738 feet long and about 30 feet deep (); one chamber of each pair would be wide, the other . There would be eight sets of locks, two at Bohio Soldado and two at Obispo on the Atlantic side; one at Paraiso, two at Pedro Miguel, and one at Miraflores on the Pacific. Artificial lakes would be formed by damming the Chagres River at Bohio and Alhajuela, providing both flood control and electric power.


United States acquisition

At this time, the President and the Senate of the United States were interested in establishing a canal across the isthmus, with some favoring a canal across Nicaragua and others advocating the purchase of the French interests in Panama. Bunau-Varilla, who was seeking American involvement, asked for $100 million, but accepted $40 million in the face of the Nicaraguan option. In June 1902, the US Senate voted in favor of the
Spooner Act The First Spooner Act of 1902 (also referred to as the Panama Canal Act, 32 Stat. 481) was written by a United States senator from Wisconsin, John Coit Spooner, enacted on June 28, 1902, and signed by President Roosevelt the following day. It aut ...
, to pursue the Panamanian option, provided the necessary rights could be obtained. On January 22, 1903, the
Hay–Herrán Treaty The Hay–Herrán Treaty was a treaty signed on January 22, 1903, between United States Secretary of State John M. Hay of the United States and Tomás Herrán of Colombia. Had it been ratified, it would have allowed the United States a renewab ...
was signed by
United States Secretary of State The United States secretary of state is a member of the executive branch of the federal government of the United States and the head of the U.S. Department of State. The office holder is one of the highest ranking members of the president's Ca ...
John M. Hay and Colombian Chargé Dr. Tomás Herrán. For $10 million and an annual payment, it would have granted the United States a renewable
lease A lease is a contractual arrangement calling for the user (referred to as the ''lessee'') to pay the owner (referred to as the ''lessor'') for the use of an asset. Property, buildings and vehicles are common assets that are leased. Industrial ...
in perpetuity from Colombia on the land proposed for the canal. The treaty was ratified by the US Senate on March 14, 1903, but the
Senate of Colombia The Senate of the Republic of Colombia ( es, Senado de la República de Colombia) is the upper house of the Congress of Colombia, with the lower house being the House of Representatives. The Senate has 108 members elected for concurrent (non-r ...
did not ratify it. Bunau-Varilla told President
Theodore Roosevelt Theodore Roosevelt Jr. ( ; October 27, 1858 – January 6, 1919), often referred to as Teddy or by his initials, T. R., was an American politician, statesman, soldier, conservationist, naturalist, historian, and writer who served as the 26t ...
and Hay of a possible revolt by Panamanian rebels who aimed to separate from Colombia, and hoped that the United States would support the rebels with US troops and money. Roosevelt changed tactics, based in part on the
Mallarino–Bidlack Treaty The Mallarino–Bidlack Treaty (also known as the Bidlack Treaty and Treaty of New Granada) was a treaty signed between New Granada (today Colombia and Panama) and the United States, on December 12, 1846.Kellogg Institute at the University of Not ...
of 1846, and actively supported the
separation of Panama from Colombia The separation of Panama from Colombia was formalized on 3 November 1903, with the establishment of the Republic of Panama. From the Independence of Panama from Spain in 1821, Panama had simultaneously declared independence from Spain and joi ...
. Shortly after recognizing Panama, he signed a treaty with the new Panamanian government under terms similar to the Hay–Herrán Treaty. On November 2, 1903, US warships blocked sea lanes against possible Colombian troop movements en route to put down the Panama rebellion. Panama declared independence on November 3, 1903. The United States quickly recognized the new nation. This happened so quickly that by the time the Colombian government in
Bogotá Bogotá (, also , , ), officially Bogotá, Distrito Capital, abbreviated Bogotá, D.C., and formerly known as Santa Fe de Bogotá (; ) during the Spanish period and between 1991 and 2000, is the capital city of Colombia, and one of the larges ...
launched a response to the Panamanian uprising US troops had already entered the rebelling province. It should also be stated that the Colombian troops dispatched to Panama were hastily assembled conscripts with little training. While these Conscripts may have been able to defeat the Panamanian rebels, they would not have been able to defeat the US army troops that were supporting the Panamanian rebels. The reason an army of conscripts was sent was that it was the best response the Colombians could muster, as Colombia still was recovering from a civil war between Liberals and Conservatives from October, 1899 to November, 1902 known as the "
Thousand Days War The Thousand Days' War ( es, Guerra de los Mil Días) was a civil war fought in Colombia from 17 October 1899 to 21 November 1902, at first between the Liberal Party and the government led by the National Party, and later – after the Conser ...
". With the US being fully aware of these conditions and even incorporating them into the planning of the Panama intervention as the US acted as an arbitrator between the two sides; with the peace treaty that ended the "Thousand Days War" being signed on the USS Wisconsin on November 21, 1902. While in port the US also brought engineering teams to Panama, with the peace delegation, to begin planning for the canal's construction before the US had even gained the rights to build the canal. All these factors would result in the Colombians being unable to put down the Panamanian rebellion and expel the United States troops occupying what today is the independent nation of Panama. On November 6, 1903, Philippe Bunau-Varilla, as Panama's ambassador to the United States, signed the
Hay–Bunau-Varilla Treaty The Hay–Bunau-Varilla Treaty ( es, Tratado Hay-Bunau Varilla) was a treaty signed on November 18, 1903, by the United States and Panama, which established the Panama Canal Zone and the subsequent construction of the Panama Canal. It was named a ...
, granting rights to the United States to build and indefinitely administer the Panama Canal Zone and its defenses. This is sometimes misinterpreted as the "99-year lease" because of misleading wording included in article 22 of the agreement. Almost immediately, the treaty was condemned by many Panamanians as an infringement on their country's new national sovereignty. This would later become a contentious diplomatic issue among Colombia, Panama, and the United States. President Roosevelt famously stated, "I took the Isthmus, started the canal and then left Congress not to debate the canal, but to debate me." Several parties in the United States called this an act of war on Colombia: The ''
New York Times ''The New York Times'' (''the Times'', ''NYT'', or the Gray Lady) is a daily newspaper based in New York City with a worldwide readership reported in 2020 to comprise a declining 840,000 paid print subscribers, and a growing 6 million paid d ...
'' described the support given by the United States to Bunau-Varilla as an "act of sordid conquest". The ''
New York Evening Post The ''New York Post'' (''NY Post'') is a conservative daily tabloid newspaper published in New York City. The ''Post'' also operates NYPost.com, the celebrity gossip site PageSix.com, and the entertainment site Decider.com. It was established i ...
'' called it a "vulgar and mercenary venture". The US maneuvers are often cited as the classic example of US
gunboat diplomacy In international politics, the term gunboat diplomacy refers to the pursuit of foreign policy objectives with the aid of conspicuous displays of naval power, implying or constituting a direct threat of warfare should terms not be agreeable to th ...
in Latin America, and the best illustration of what Roosevelt meant by the old African adage, "Speak softly and carry a big stick ndyou will go far." After the revolution in 1903, the Republic of Panama became a US
protectorate A protectorate, in the context of international relations, is a State (polity), state that is under protection by another state for defence against aggression and other violations of law. It is a dependent territory that enjoys autonomy over m ...
until 1939. In 1904, the United States purchased the French equipment and excavations, including the
Panama Railroad The Panama Canal Railway ( es, Ferrocarril de Panamá) is a railway line linking the Atlantic Ocean to the Pacific Ocean in Central America. The route stretches across the Isthmus of Panama from Colón (Atlantic) to Balboa (Pacific, near P ...
, for US$40 million, of which $30 million related to excavations completed, primarily in the
Culebra Cut The Culebra Cut, formerly called Gaillard Cut, is an artificial valley that cuts through the Continental Divide in Panama. The cut forms part of the Panama Canal, linking Gatun Lake, and thereby the Atlantic Ocean, to the Gulf of Panama and henc ...
, valued at about $1.00 per cubic yard. The United States also paid the new country of Panama $10 million and a $250,000 payment each following year. In 1921, Colombia and the United States entered into the
Thomson–Urrutia Treaty The Thomson–Urrutia Treaty was ratified on April 20, 1921 between the United States and Colombia. Based on the terms of the agreement, the U.S. paid Colombia 25 million dollars in return for Colombia's recognition of Panama's independence. This ...
, in which the United States agreed to pay Colombia $25 million: $5 million upon ratification, and four-$5 million annual payments, and grant Colombia special privileges in the Canal Zone. In return, Colombia recognized Panama as an independent nation.


United States construction of the Panama canal, 1904–1914

The US formally took control of the canal property on May 4, 1904, inheriting from the French a depleted workforce and a vast jumble of buildings, infrastructure, and equipment, much of it in poor condition. A US government commission, the
Isthmian Canal Commission The Isthmian Canal Commission (often known as the ICC) was an American administration commission set up to oversee the construction of the Panama Canal in the early years of American involvement. Established on February 26, 1904, it was given cont ...
(ICC), was established to oversee construction; it was given control of the Panama Canal Zone, over which the United States exercised sovereignty. The commission reported directly to
Secretary of War The secretary of war was a member of the U.S. president's Cabinet, beginning with George Washington's administration. A similar position, called either "Secretary at War" or "Secretary of War", had been appointed to serve the Congress of the ...
William Howard Taft William Howard Taft (September 15, 1857March 8, 1930) was the 27th president of the United States (1909–1913) and the tenth chief justice of the United States (1921–1930), the only person to have held both offices. Taft was elected pr ...
and was directed to avoid the inefficiency and corruption that had plagued the French 15 years earlier. On May 6, 1904, President Theodore Roosevelt appointed
John Findley Wallace John Findley Wallace (September 10, 1852 – July 3, 1921) was an American engineer and administrator, best known for serving as the Chief Engineer of the Panama Canal between 1904 and 1905. He had previously gained experience in railroad ...
, formerly chief engineer and finally general manager of the
Illinois Central Railroad The Illinois Central Railroad , sometimes called the Main Line of Mid-America, was a railroad in the Central United States, with its primary routes connecting Chicago, Illinois, with New Orleans, Louisiana, and Mobile, Alabama. A line also co ...
, as chief engineer of the Panama Canal Project. Overwhelmed by the disease-plagued country and forced to use often dilapidated French infrastructure and equipment, as well as being frustrated by the overly bureaucratic ICC, Wallace resigned abruptly in June 1905. He was succeeded by
John Frank Stevens John Frank Stevens (April 25, 1853 – June 2, 1943) was an American civil engineer who built the Great Northern Railway in the United States and was chief engineer on the Panama Canal between 1905 and 1907. Biography Stevens was born in ...
, a self-educated engineer who had built the Great Northern Railroad. Stevens was not a member of the ICC; he increasingly viewed its bureaucracy as a serious hindrance, bypassing the commission and sending requests and demands directly to the Roosevelt administration in Washington, DC. One of Stevens' first achievements in Panama was in building and rebuilding the housing, cafeterias, hotels, water systems, repair shops, warehouses, and other infrastructure needed by the thousands of incoming workers. Stevens began the recruitment effort to entice thousands of workers from the United States and other areas to come to the Canal Zone to work. Workers from the Caribbean—called "
Afro-Panamanians Afro-Panamanians are Panamanians of African descent. The Afro-Panamanian population can be mainly broken into one of two categories "Afro-Colonials", Afro-Panamanians descended from slaves brought to Panama during the colonial period, and "Afro-A ...
"—came in large numbers and many settled permanently. Stevens tried to provide accommodation in which the workers could work and live in reasonable safety and comfort. He also re-established and enlarged the railway, which was to prove crucial in transporting millions of tons of soil from the cut through the mountains to the dam across the Chagres River. Colonel
William C. Gorgas William Crawford Gorgas KCMG (October 3, 1854 – July 3, 1920) was a United States Army physician and 22nd Surgeon General of the U.S. Army (1914–1918). He is best known for his work in Florida, Havana and at the Panama Canal in abating the ...
had been appointed chief sanitation officer of the canal construction project in 1904. Gorgas implemented a range of measures to minimize the spread of deadly diseases, particularly
yellow fever Yellow fever is a viral disease of typically short duration. In most cases, symptoms include fever, chills, loss of appetite, nausea, muscle pains – particularly in the back – and headaches. Symptoms typically improve within five days. In ...
and
malaria Malaria is a mosquito-borne infectious disease that affects humans and other animals. Malaria causes symptoms that typically include fever, tiredness, vomiting, and headaches. In severe cases, it can cause jaundice, seizures, coma, or death. S ...
, which had recently been shown to be mosquito-borne following the work of Dr.
Carlos Finlay Carlos Juan Finlay (December 3, 1833 – August 20, 1915) was a Cuban epidemiologist recognized as a pioneer in the research of yellow fever, determining that it was transmitted through mosquitoes ''Aedes aegypti''. Biography Early life and ...
and Dr.
Walter Reed Walter Reed (September 13, 1851 – November 22, 1902) was a U.S. Army physician who in 1901 led the team that confirmed the theory of Cuban doctor Carlos Finlay that yellow fever is transmitted by a particular mosquito species rather than b ...
. Investment was made in extensive sanitation projects, including city water systems, fumigation of buildings, spraying of insect-breeding areas with oil and larvicide, installation of mosquito netting and window screens, and elimination of stagnant water. Despite opposition from the commission (one member said his ideas were barmy), Gorgas persisted, and when Stevens arrived, he threw his weight behind the project. After two years of extensive work, the mosquito-spread diseases were nearly eliminated. Even after all that effort, about 5,600 workers died of disease and accidents during the US construction phase of the canal. In 1905, a US engineering panel was commissioned to review the canal design, which had not been finalized. In January 1906 the panel, in a majority of eight to five, recommended to President Roosevelt a sea-level canal, as had been attempted by the French and temporarily abandoned by them in 1887 for a ten locks system designed by Philippe Bunau-Varilla, and definitively in 1898 for a lock-and-lake canal designed by the Comité Technique of the Compagnie Nouvelle de Canal de Panama as conceptualized by Adolphe Godin de Lépinay in 1879. But in 1906 Stevens, who had seen the Chagres in full flood, was summoned to Washington; he declared a sea-level approach to be "an entirely untenable proposition". He argued in favor of a canal using a lock system to raise and lower ships from a large reservoir above sea level. This would create both the largest dam (Gatun Dam) and the largest human-made lake (Gatun Lake) in the world at that time. The water to refill the locks would be taken from Gatun Lake by opening and closing enormous gates and valves and letting gravity propel the water from the lake. Gatun Lake would connect to the Pacific through the mountains at the Gaillard (Culebra) Cut. Unlike Godin de Lépinay with the Congrès International d'Etudes du Canal Interocéanique, Stevens successfully convinced Roosevelt of the necessity and feasibility of this alternative scheme. The construction of a canal with locks required the excavation of more than of material over and above the excavated by the French. As quickly as possible, the Americans replaced or upgraded the old, unusable French equipment with new construction equipment that was designed for a much larger and faster scale of work. 102 large, railroad-mounted
steam shovel A steam shovel is a large steam-powered excavating machine designed for lifting and moving material such as rock and soil. It is the earliest type of power shovel or excavator. Steam shovels played a major role in public works in the 19th and e ...
s were purchased, 77 from
Bucyrus-Erie Bucyrus-Erie was an American surface and underground mining equipment company. It was founded as Bucyrus Foundry and Manufacturing Company in Bucyrus, Ohio, in 1880. Bucyrus moved its headquarters to South Milwaukee, Wisconsin in 1893. In 1927, B ...
, and 25 from the
Marion Power Shovel Company Marion Power Shovel Company was an American firm that designed, manufactured and sold steam shovels, power shovels, blast hole drills, excavators, and dragline excavators for use in the construction and mining industries. The company was a ma ...
. These were joined by enormous steam-powered cranes, giant hydraulic rock crushers,
concrete mixer A concrete mixer (often colloquially called a cement mixer) is a device that homogeneously combines cement, aggregate such as sand or gravel, and water to form concrete. A typical concrete mixer uses a revolving drum to mix the components. F ...
s,
dredge Dredging is the excavation of material from a water environment. Possible reasons for dredging include improving existing water features; reshaping land and water features to alter drainage, navigability, and commercial use; constructing da ...
s, and pneumatic power drills, nearly all of which were manufactured by new, extensive machine-building technology developed and built in the United States. The railroad also had to be comprehensively upgraded with heavy-duty, double-tracked rails over most of the line to accommodate new
rolling stock The term rolling stock in the rail transport industry refers to railway vehicles, including both powered and unpowered vehicles: for example, locomotives, freight and passenger cars (or coaches), and non-revenue cars. Passenger vehicles can b ...
. In many places, the new Gatun Lake flooded over the original rail line, and a new line had to be constructed above Gatun Lake's waterline.


Goethals replaces Stevens as chief engineer

In 1907, Stevens resigned as chief engineer. His replacement, appointed by President Theodore Roosevelt, was US Army Major
George Washington Goethals George Washington Goethals ( June 29, 1858 – January 21, 1928) was a United States Army General and civil engineer, best known for his administration and supervision of the construction and the opening of the Panama Canal. He was the State E ...
of the
US Army Corps of Engineers , colors = , anniversaries = 16 June (Organization Day) , battles = , battles_label = Wars , website = , commander1 = ...
. Soon to be promoted to lieutenant colonel and later to general, he was a strong,
West Point The United States Military Academy (USMA), also known Metonymy, metonymically as West Point or simply as Army, is a United States service academies, United States service academy in West Point, New York. It was originally established as a f ...
-trained leader and civil engineer with experience in canals (unlike Stevens). Goethals directed the work in Panama to a successful conclusion in 1914, two years ahead of the target date of June 10, 1916. Goethals divided the engineering and excavation work into three divisions: Atlantic, Central, and Pacific. The Atlantic Division, under Major William L. Sibert, was responsible for construction of the massive
breakwater Breakwater may refer to: * Breakwater (structure), a structure for protecting a beach or harbour Places * Breakwater, Victoria, a suburb of Geelong, Victoria, Australia * Breakwater Island Breakwater Island () is a small island in the Palme ...
at the entrance to
Limon Bay Limon Bay (''Bahía Limón'' in the original Spanish) is a natural harbor located at the north end of the Panama Canal, west of the cities of Cristóbal and Colón. Ships waiting to enter the canal stay here, protected from storms by breakwaters ...
, the
Gatun locks The Panama Canal locks ( es, Esclusas del Canal de Panamá) are a lock system that lifts ships up to the main elevation of the Panama Canal and down again. The original canal had a total of six steps (three up, three down) for a ship's passage. ...
, and their approach channel, and the immense Gatun Dam. The Pacific Division, under Sydney B. Williamson (the only civilian member of this high-level team), was similarly responsible for the Pacific breakwater in
Panama Bay The Panama Bay ( es, Bahia de Panamá) is a large body of water off the coast of southern Panama, at . It is a part of the greater Gulf of Panama. Pollution Problems The Panama Bay is considered to be in an eutrophic state by the World Resources ...
, the approach channel to the locks, and the Miraflores and Pedro Miguel locks and their associated dams and reservoirs. The Central Division, under Major
David du Bose Gaillard David du Bose Gaillard (September 4, 1859 – December 5, 1913) was a U.S. Army engineer instrumental in the construction of the Panama Canal. During the years of the US Canal Zone (c. 1915–2000), the Culebra Cut in the Panama Canal bore his ...
of the
United States Army Corps of Engineers , colors = , anniversaries = 16 June (Organization Day) , battles = , battles_label = Wars , website = , commander1 = ...
, was assigned one of the most difficult parts: excavating the Culebra Cut through the continental divide to connect Gatun Lake to the Pacific
Panama Canal locks The Panama Canal locks ( es, Esclusas del Canal de Panamá) are a lock system that lifts ships up to the main elevation of the Panama Canal and down again. The original canal had a total of six steps (three up, three down) for a ship's passage. ...
. On October 10, 1913, President
Woodrow Wilson Thomas Woodrow Wilson (December 28, 1856February 3, 1924) was an American politician and academic who served as the 28th president of the United States from 1913 to 1921. A member of the Democratic Party, Wilson served as the president of ...
sent a signal from the
White House The White House is the official residence and workplace of the president of the United States. It is located at 1600 Pennsylvania Avenue NW in Washington, D.C., and has been the residence of every U.S. president since John Adams in 1800. ...
by
telegraph Telegraphy is the long-distance transmission of messages where the sender uses symbolic codes, known to the recipient, rather than a physical exchange of an object bearing the message. Thus flag semaphore is a method of telegraphy, whereas p ...
which triggered the explosion that destroyed the Gamboa Dike. This flooded the Culebra Cut, thereby joining the Atlantic and Pacific oceans via the Panama Canal. ''Alexandre La Valley'' (a floating crane built by Lobnitz & Company and launched in 1887) was the first self-propelled vessel to transit the canal from ocean to ocean. This vessel crossed the canal from the Atlantic in stages during construction, finally reaching the Pacific on January 7, 1914. SS ''Cristobal'' (a cargo and passenger ship built by Maryland Steel, and launched in 1902 as SS ''Tremont'') on August 3, 1914, was the first ship to transit the canal from ocean to ocean. The construction of the canal was completed in 1914, 401 years after Panama was first crossed overland by Europeans by
Vasco Núñez de Balboa Vasco Núñez de Balboa (; c. 1475around January 12–21, 1519) was a Spanish explorer, governor, and conquistador. He is best known for having crossed the Isthmus of Panama to the Pacific Ocean in 1513, becoming the first European to lead an ...
's party of
conquistador Conquistadors (, ) or conquistadores (, ; meaning 'conquerors') were the explorer-soldiers of the Spanish and Portuguese Empires of the 15th and 16th centuries. During the Age of Discovery, conquistadors sailed beyond Europe to the Americas, O ...
es. The United States spent almost $500 million (roughly equivalent to $ billion in ) to finish the project. This was by far the largest American engineering project to date. The canal was formally opened on August 15, 1914, with the passage of the
cargo ship A cargo ship or freighter is a merchant ship that carries cargo, goods, and materials from one port to another. Thousands of cargo carriers ply the world's seas and oceans each year, handling the bulk of international trade. Cargo ships are usu ...
. The opening of the Panama Canal in 1914 caused a severe drop in traffic along
Chile Chile, officially the Republic of Chile, is a country in the western part of South America. It is the southernmost country in the world, and the closest to Antarctica, occupying a long and narrow strip of land between the Andes to the east a ...
an ports due to shifts in maritime trade routes, despite the closure of the canal for nearly seven months after a land-slide in the Culebra Cut on September 18, 1915. The burgeoning sheep farming business in southern Patagonia suffered a significant setback by the change in trade routes, as did the economy of the
Falkland Islands The Falkland Islands (; es, Islas Malvinas, link=no ) is an archipelago in the South Atlantic Ocean on the Patagonian Shelf. The principal islands are about east of South America's southern Patagonian coast and about from Cape Dubouzet ...
. Throughout this time,
Ernest "Red" Hallen Ernest “Red” Hallen (1875–1947) was an American photographer, noted for his 30 years of work as the official photographer of the Panama Canal. Life and work Hallen was born in Atlanta, Georgia, in 1875. After spending six years in Puerto ...
was hired by the
Isthmian Canal Commission The Isthmian Canal Commission (often known as the ICC) was an American administration commission set up to oversee the construction of the Panama Canal in the early years of American involvement. Established on February 26, 1904, it was given cont ...
to document the progress of the work. In 1914
steam shovel A steam shovel is a large steam-powered excavating machine designed for lifting and moving material such as rock and soil. It is the earliest type of power shovel or excavator. Steam shovels played a major role in public works in the 19th and e ...
s from the Panama Canal were purchased and put to use in
Chuquicamata Chuquicamata ( ; referred to as Chuqui for short) is the largest open pit copper mine in terms of excavated volume in the world. It is located in the north of Chile, just outside Calama, at above sea level. It is northeast of Antofagasta and ...
copper mine of northern Chile. MarioModel90 1908.jpg, A Marion
steam shovel A steam shovel is a large steam-powered excavating machine designed for lifting and moving material such as rock and soil. It is the earliest type of power shovel or excavator. Steam shovels played a major role in public works in the 19th and e ...
excavating the Panama Canal in 1908 Panama Canal Lock Forms.jpeg, The Panama Canal locks under construction in 1910 SS Ancon entering west chamber cph.3b17471u.jpg, The first ship to transit the canal, the SS ''Ancon'', passes through on 15 August 1914 Spanish laborers on Panama Canal in early 1900s.jpg, Spanish laborers working on the Panama Canal in early 1900s


Later developments

By the 1930s, water supply became an issue for the canal, prompting construction of the
Madden Dam The Madden Dam, completed in 1935, impounds the Chagres River in Panama to form Lake Alajuela, a reservoir that is an essential part of the Panama Canal watershed. The lake has a maximum level of above sea level. It can store one third of the ...
across the Chagres River above Gatun Lake. Completed in 1935, the dam created Madden Lake (later Alajuela Lake), which provides additional water storage for the canal. In 1939, construction began on a further major improvement: a new set of locks large enough to carry the larger warships that the United States was building at the time and planned to continue building. The work proceeded for several years, and significant excavation was carried out on the new approach channels, but the project was canceled after World War II. After World War II, US control of the canal and the Canal Zone surrounding it became contentious; relations between Panama and the United States became increasingly tense. Many Panamanians felt that the Zone rightfully belonged to Panama; student protests were met by the fencing-in of the zone and an increased military presence there. Demands for the United States to hand over the canal to Panama increased after the
Suez Crisis The Suez Crisis, or the Second Arab–Israeli war, also called the Tripartite Aggression ( ar, العدوان الثلاثي, Al-ʿUdwān aṯ-Ṯulāṯiyy) in the Arab world and the Sinai War in Israel,Also known as the Suez War or 1956 Wa ...
in 1956, when the United States used financial and diplomatic pressure to force France and the UK to abandon their attempt to retake control of the
Suez Canal The Suez Canal ( arz, قَنَاةُ ٱلسُّوَيْسِ, ') is an artificial sea-level waterway in Egypt, connecting the Mediterranean Sea to the Red Sea through the Isthmus of Suez and dividing Africa and Asia. The long canal is a popular ...
, previously nationalized by the Nasser regime in Egypt. Panamanian unrest culminated in riots on
Martyr's Day Martyrs' Day is an annual day observed by nations to salute the martyrdom of soldiers who lost their lives defending the sovereignty of the nation. The actual date may vary from one country to another. Here is a list of countries and Martyrs' Days. ...
, January 9, 1964, when about 20 Panamanians and 3–5 US soldiers were killed. A decade later, in 1974, negotiations toward a settlement began and resulted in the
Torrijos–Carter Treaties The Torrijos–Carter Treaties ( es, link=no, Tratados Torrijos-Carter) are two treaties signed by the United States and Panama in Washington, D.C. on September 7, 1977, which superseded the Hay–Bunau-Varilla Treaty of 1903. The treaties guara ...
. On September 7, 1977, the treaty was signed by President of the United States
Jimmy Carter James Earl Carter Jr. (born October 1, 1924) is an American politician who served as the 39th president of the United States from 1977 to 1981. A member of the Democratic Party (United States), Democratic Party, he previously served as th ...
and
Omar Torrijos Omar Efraín Torrijos Herrera (February 13, 1929 – July 31, 1981) was the Commander of the Panamanian National Guard and military leader of Panama from 1968 to his death in 1981. Torrijos was never officially the president of Panama, ...
, ''de facto'' leader of Panama. This mobilized the process of granting the Panamanians free control of the canal so long as Panama signed a treaty guaranteeing the permanent neutrality of the canal. The treaty led to full Panamanian control effective at noon on December 31, 1999, and the Panama Canal Authority (ACP) assumed command of the waterway. The Panama Canal remains one of the chief revenue sources for Panama. Before this handover, the government of Panama held an international bid to negotiate a 25-year contract for operation of the container shipping ports located at the canal's Atlantic and Pacific outlets. The contract was not affiliated with the ACP or Panama Canal operations and was won by the firm
Hutchison Whampoa Hutchison Whampoa Limited (HWL) was an investment holding company based in Hong Kong. It was a Fortune Global 500 company and one of the largest companies listed on the Hong Kong Stock Exchange. HWL was an international corporation with a dive ...
, a Hong Kong–based shipping interest owned by
Li Ka-shing Sir Ka-shing Li (; born 13 June 1928) is a Hong Kong billionaire business magnate, investor, and philanthropist. As of June 2019, Li is the 31st richest person in the world, with an estimated net wealth of US$33.4 billion. He is the senior ad ...
.


Canal


Layout

While globally the Atlantic Ocean is east of the isthmus and the Pacific is west, the general direction of the canal passage from the Atlantic to the Pacific is from northwest to southeast, because of the shape of the isthmus at the point the canal occupies. The
Bridge of the Americas The Bridge of the Americas ( es, Puente de las Américas; originally known as the Thatcher Ferry Bridge) is a road bridge in Panama which spans the Pacific entrance to the Panama Canal. Designed by Sverdrup & Parcel, it was completed in 1962 at ...
( es, Puente de las Américas) at the Pacific side is about a third of a degree east of the Colón end on the Atlantic side. Still, in formal nautical communications, the simplified directions "southbound" and "northbound" are used. The canal consists of
artificial lakes A reservoir (; from French ''réservoir'' ) is an enlarged lake behind a dam. Such a dam may be either artificial, built to store fresh water or it may be a natural formation. Reservoirs can be created in a number of ways, including contro ...
, several improved and artificial channels, and three sets of
locks Lock(s) may refer to: Common meanings *Lock and key, a mechanical device used to secure items of importance *Lock (water navigation), a device for boats to transit between different levels of water, as in a canal Arts and entertainment * ''Lock ...
. An additional artificial lake, Alajuela Lake (known during the American era as Madden Lake), acts as a reservoir for the canal. The layout of the canal as seen by a ship passing from the Atlantic to the Pacific is: * From the formal marking line of the Atlantic Entrance, one enters Limón Bay (Bahía Limón), a large natural harbor. The entrance runs . It provides a deepwater port (
Cristóbal Cristóbal or Cristobal, the Spanish version of Christopher, is a masculine given name and a surname which may refer to: Given name *Cristóbal Balenciaga (1895–1972), Spanish fashion designer *Cristóbal Cobo (born 1976), Chilean academic *Cri ...
), with facilities like multimodal cargo exchange (to and from train) and the
Colón Free Trade Zone The Colón Free Trade Zone is a free port in Panama dedicated to re-exporting a wide variety of merchandise to Latin America and the Caribbean. It is located on the Caribbean coast, near the Atlantic entrance to the Panama Canal, in the province ...
(a
free port Free economic zones (FEZ), free economic territories (FETs) or free zones (FZ) are a class of special economic zone (SEZ) designated by the trade and commerce administrations of various countries. The term is used to designate areas in which com ...
). * A channel forms the approach to the locks from the Atlantic side. * The Gatun Locks, a three-stage flight of locks long, lifts ships to the Gatun Lake level, some above sea level. * Gatun Lake, an artificial lake formed by the building of the Gatun Dam, carries vessels across the isthmus. It is the summit canal stretch, fed by the Gatun River and emptied by basic lock operations. * From the lake, the Chagres River, a natural waterway enhanced by the damming of Gatun Lake, runs about . Here the upper Chagres River feeds the high-level-canal stretch. * The
Culebra Cut The Culebra Cut, formerly called Gaillard Cut, is an artificial valley that cuts through the Continental Divide in Panama. The cut forms part of the Panama Canal, linking Gatun Lake, and thereby the Atlantic Ocean, to the Gulf of Panama and henc ...
slices through the mountain ridge, crosses the
continental divide A continental divide is a drainage divide on a continent such that the drainage basin on one side of the divide feeds into one ocean or sea, and the basin on the other side either feeds into a different ocean or sea, or else is endorheic, not ...
and passes under the Centennial Bridge. * The single-stage Pedro Miguel Lock, which is long, is the first part of the descent with a lift of . * The artificial Miraflores Lake long, and
above sea level Height above mean sea level is a measure of the vertical distance (height, elevation or altitude) of a location in reference to a historic mean sea level taken as a vertical datum. In geodesy, it is formalized as ''orthometric heights''. The comb ...
. * The two-stage Miraflores Locks is long, with a total descent of at mid-tide. * From the Miraflores Locks one reaches Balboa harbor, again with multimodal exchange provision (here the railway meets the shipping route again). Nearby is
Panama City Panama City ( es, Ciudad de Panamá, links=no; ), also known as Panama (or Panamá in Spanish), is the capital and largest city of Panama. It has an urban population of 880,691, with over 1.5 million in its metropolitan area. The city is locat ...
. * From this harbor an entrance/exit channel leads to the Pacific Ocean (
Gulf of Panama The Gulf of Panama ( es, Golfo de Panamá) is a gulf of the Pacific Ocean off the southern coast of Panama, where most of eastern Panama's southern shores adjoin it. The Gulf has a maximum width of , a maximum depth of and the size of . The Pana ...
), from the Miraflores Locks, passing under the
Bridge of the Americas The Bridge of the Americas ( es, Puente de las Américas; originally known as the Thatcher Ferry Bridge) is a road bridge in Panama which spans the Pacific entrance to the Panama Canal. Designed by Sverdrup & Parcel, it was completed in 1962 at ...
. Thus, the total length of the canal is .


Navigation


Gatun Lake

Created in 1913 by damming the Chagres River, the
Gatun Lake Gatun Lake ( es, Lago Gatún) is a large freshwater artificial lake to the south of Colón, Panama. At approximately above sea level, it forms a major part of the Panama Canal, carrying ships of their transit across the Isthmus of Panama. Gatun ...
is a key part of the Panama Canal, providing the millions of liters of water necessary to operate its locks each time a ship passes through. At time of formation, Gatun Lake was the largest human-made lake in the world. The largest island on Gatun Lake is
Barro Colorado Island Barro Colorado Island is located in the man-made Gatun Lake in the middle of the Panama Canal. The island was formed when the waters of the Chagres River were dammed to form the lake in 1913. When the waters rose, they covered a significant par ...
. It was established for scientific study when the lake was formed, and is operated by the
Smithsonian Institution The Smithsonian Institution ( ), or simply the Smithsonian, is a group of museums and education and research centers, the largest such complex in the world, created by the U.S. government "for the increase and diffusion of knowledge". Founded ...
. Many important scientific and biological discoveries of the tropical animal and plant kingdom originated here. Gatun Lake covers about , a vast tropical ecological zone and part of the Atlantic Forest Corridor. Ecotourism on the lake has become an industry for Panamanians. Gatun Lake also provides drinking water for Panama City and Colón. Fishing is one of the primary recreational pursuits on Gatun Lake. Non-native peacock bass were introduced by accident to Gatun Lake around 1967 by a local businessman, and have since flourished to become the dominant angling
game fish Game fish, sport fish or quarry refer to popular fish pursued by recreational anglers, and can be freshwater or saltwater fish. Game fish can be eaten after being caught, or released after capture. Some game fish are also targeted commerciall ...
in Gatun Lake. Locally called Sargento and believed to be the species ''Cichla pleiozona'', these peacock bass originate from the Amazon, Rio Negro, and Orinoco river basins, where they are considered a premier game fish.


Lock size

The size of the locks determines the maximum size ship that can pass through. Because of the importance of the canal to international trade, many ships are built to the maximum size allowed. These are known as
Panamax Panamax and New Panamax (or Neopanamax) are terms for the size limits for ships travelling through the Panama Canal. The limits and requirements are published by the Panama Canal Authority (ACP) in a publication titled "Vessel Requirements". ...
vessels. A Panamax cargo ship typically has a
deadweight tonnage Deadweight tonnage (also known as deadweight; abbreviated to DWT, D.W.T., d.w.t., or dwt) or tons deadweight (DWT) is a measure of how much weight a ship can carry. It is the sum of the weights of cargo, fuel, fresh water, ballast water, provi ...
(DWT) of 65,000–80,000 tons, but its actual cargo is restricted to about 52,500 tons because of the
draft Draft, The Draft, or Draught may refer to: Watercraft dimensions * Draft (hull), the distance from waterline to keel of a vessel * Draft (sail), degree of curvature in a sail * Air draft, distance from waterline to the highest point on a vesse ...
restrictions within the canal. The longest ship ever to transit the canal was the ''San Juan Prospector'' (now ''Marcona Prospector''), an
ore-bulk-oil carrier An ore-bulk-oil carrier, also known as combination carrier or OBO, is a ship designed to be capable of carrying wet or dry cargoes. The idea is to reduce the number of empty (ballast) voyages, in which large ships only carry a cargo one way and re ...
that is long with a
beam Beam may refer to: Streams of particles or energy *Light beam, or beam of light, a directional projection of light energy **Laser beam *Particle beam, a stream of charged or neutral particles **Charged particle beam, a spatially localized grou ...
of . Initially the locks at Gatun were designed to be wide. In 1908, the
United States Navy The United States Navy (USN) is the maritime service branch of the United States Armed Forces and one of the eight uniformed services of the United States. It is the largest and most powerful navy in the world, with the estimated tonnage ...
requested that an increased width of at least to allow the passage of US naval ships. Eventually a compromise was made and the locks were built wide. Each lock is long, with the walls ranging in thickness from at the base to at the top. The central wall between the parallel locks at Gatun is thick and over high. The steel lock gates measure an average of thick, wide, and high. Panama Canal pilots were initially unprepared to handle the significant flight deck overhang of
aircraft carrier An aircraft carrier is a warship that serves as a seagoing airbase, equipped with a full-length flight deck and facilities for carrying, arming, deploying, and recovering aircraft. Typically, it is the capital ship of a fleet, as it allows a ...
s. knocked over all the adjacent concrete lamp posts while passing through the Gatun Locks for the first time in 1928. It is the size of the locks, specifically the Pedro Miguel Locks, along with the height of the Bridge of the Americas at Balboa, that determine the Panamax metric and limit the size of ships that may use the canal. The 2006 third set of locks project has created larger locks, allowing bigger ships to transit through deeper and wider channels. The allowed dimensions of ships using these locks increased by 25 percent in length, 51 percent in beam, and 26 percent in draft, as defined by New Panamax metrics.


Tolls

As with a
toll road A toll road, also known as a turnpike or tollway, is a public or private road (almost always a controlled-access highway in the present day) for which a fee (or ''toll'') is assessed for passage. It is a form of road pricing typically implemented ...
, vessels transiting the canal must pay tolls. Tolls for the canal are set by the
Panama Canal Authority The Panama Canal Authority ( es, Autoridad del Canal de Panamá (ACP)) is the agency of the government of Panama responsible for the operation and management of the Panama Canal. The ACP took over the administration of the canal from the Panama ...
and are based on vessel type, size, and the type of cargo. For
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 intermodal ...
s, the toll is assessed on the ship's capacity expressed in
twenty-foot equivalent unit The twenty-foot equivalent unit (abbreviated TEU or teu) is an inexact unit of cargo capacity, often used for container ships and container ports.Rowlett, 2004. It is based on the volume of a intermodal container, a standard-sized metal box whic ...
s (TEUs), one TEU being the size of a standard
intermodal shipping container An intermodal container, often called a shipping container, is a large standardized shipping container, designed and built for intermodal freight transport, meaning these containers can be used across different Mode of transport, modes of trans ...
. Effective April 1, 2016, this toll went from US$74 per loaded container to $60 per TEU capacity plus $30 per loaded container for a potential $90 per TEU when the ship is full. A Panamax container ship may carry up to . The toll is calculated differently for passenger ships and for container ships carrying no cargo ("in ballast"). , the ballast rate is US$60, down from US$65.60 per TEU. Passenger vessels in excess of 30,000 tons (PC/UMS) pay a rate based on the number of berths, that is, the number of passengers that can be accommodated in permanent beds. The per-berth charge since April 1, 2016 is $111 for unoccupied berths and $138 for occupied berths in the Panamax locks. Started in 2007, this fee has greatly increased the tolls for such ships. Passenger vessels of less than 30,000 tons or less than 33 tons per passenger are charged according to the same per-ton schedule as are freighters. Almost all major cruise ships have more than 33 tons per passenger; the rule of thumb for cruise line comfort is generally given as a minimum of 40 tons per passenger. Most other types of vessel pay a toll per PC/UMS net ton, in which one "ton" is actually a volume of . (The calculation of
tonnage Tonnage is a measure of the cargo-carrying capacity of a ship, and is commonly used to assess fees on commercial shipping. The term derives from the taxation paid on ''tuns'' or casks of wine. In modern maritime usage, "tonnage" specifically ref ...
for commercial vessels is quite complex.) , this toll is US$5.25 per ton for the first 10,000 tons, US$5.14 per ton for the next 10,000 tons, and US$5.06 per ton thereafter. As with container ships, reduced tolls are charged for freight ships "in ballast", $4.19, $4.12, $4.05 respectively. On 1 April 2016, a more complicated toll system was introduced, having the neopanamax locks at a higher rate in some cases, natural gas transport as a new separate category and other changes. As of October 1, 2017, there are modified tolls and categories of tolls in effect. Small (less than 125 ft) vessels up to 583 PC/UMS net tons when carrying passengers or cargo, or up to 735 PC/UMS net tons when in ballast, or up to 1,048 fully loaded displacement tons, are assessed minimum tolls based upon their
length overall __NOTOC__ Length overall (LOA, o/a, o.a. or oa) is the maximum length of a vessel's hull measured parallel to the waterline. This length is important while docking the ship. It is the most commonly used way of expressing the size of a ship, an ...
, according to the following table (as of 29 April 2015): Morgan Adams of Los Angeles, California, holds the distinction of paying the first toll received by the United States Government for the use of the Panama Canal by a pleasure boat. His boat ''Lasata'' passed through the Zone on August 14, 1914. The crossing occurred during a sea voyage from Jacksonville, Florida, to Los Angeles in 1914. The most expensive regular toll for canal passage to date was charged on April 14, 2010, to the cruise ship ''
Norwegian Pearl ''Norwegian Pearl'' is a of Norwegian Cruise Line (NCL), launched in 2006, sailing itineraries primarily around Alaska and the Caribbean. Vessel class ''Norwegian Pearl'' is the third of NCL's four ''Jewel''-class ships. She was preceded by i ...
,'' which paid US$375,600. The average toll is around US$54,000. The highest fee for priority passage charged through the Transit Slot Auction System was US$220,300, paid on August 24, 2006, by the Panamax tanker ''Erikoussa'', bypassing a 90-ship queue waiting for the end of maintenance work on the
Gatun Locks The Panama Canal locks ( es, Esclusas del Canal de Panamá) are a lock system that lifts ships up to the main elevation of the Panama Canal and down again. The original canal had a total of six steps (three up, three down) for a ship's passage. ...
, and thus avoiding a seven-day delay. The normal fee would have been just US$13,430. The lowest toll ever paid was 36 cents (), by American
Richard Halliburton Richard Halliburton (January 9, 1900 – Declared death in absentia, presumed dead after March 24, 1939) was an American travel writing, travel writer and adventurer who swam the length of the Panama Canal and paid the lowest toll in its hi ...
who swam the Panama Canal in 1928.


Issues leading to expansion


Efficiency and maintenance

Opponents to the 1977 Torrijos-Carter Treaties feared that efficiency and maintenance would suffer following the US withdrawal from the Panama Canal Zone; however, this has been proven not to be the case. Capitalizing on practices developed during the American administration, canal operations are improving under Panamanian control. Canal Waters Time (CWT), the average time it takes a vessel to navigate the canal, including waiting time, is a key measure of efficiency; according to the ACP, since 2000, it has ranged between 20 and 30 hours. The accident rate has also not changed appreciably in the past decade, varying between 10 and 30 accidents each year from about 14,000 total annual transits. An official accident is one in which a formal investigation is requested and conducted. Increasing volumes of imports from Asia, which previously landed on US West Coast ports, are now passing through the canal to the American East Coast. The total number of ocean-going transits increased from 11,725 in 2003 to 13,233 in 2007, falling to 12,855 in 2009. (The canal's fiscal year runs from October through September.) This has been coupled with a steady rise in average ship size and in the numbers of Panamax vessels passing through the canal, so that the total tonnage carried rose from 227.9 million PC/UMS tons in fiscal year 1999 to a then record high of 312.9 million tons in 2007, and falling to 299.1 million tons in 2009. Tonnage for fiscal 2013, 2014 and 2015 was 320.6, 326.8 and 340.8 million PC/UMS tons carried on 13,660, 13,481 and 13,874 transits respectively. In the first decade after the transfer to Panamanian control, the
Panama Canal Authority The Panama Canal Authority ( es, Autoridad del Canal de Panamá (ACP)) is the agency of the government of Panama responsible for the operation and management of the Panama Canal. The ACP took over the administration of the canal from the Panama ...
(ACP) invested nearly US$1 billion in widening and modernizing the canal, with the aim of increasing capacity by 20 percent. The ACP cites a number of major improvements, including the widening and straightening of the Culebra Cut to reduce restrictions on passing vessels, the deepening of the navigational channel in Gatun Lake to reduce draft restrictions and improve water supply, and the deepening of the Atlantic and Pacific entrances to the canal. This is supported by new equipment, such as a new drill barge and suction dredger, and an increase of the
tug boat A tugboat or tug is a marine vessel that manoeuvres other vessels by pushing or pulling them, with direct contact or a tow line. These boats typically tug ships in circumstances where they cannot or should not move under their own power, suc ...
fleet by 20 percent. In addition, improvements have been made to the canal's operating machinery, including an increased and improved tug locomotive fleet, the replacement of more than of locomotive track, and new lock machinery controls. Improvements have been made to the traffic management system to allow more efficient control over ships in the canal. In December 2010, record-breaking rains caused a 17-hour closure of the canal; this was the first closure since the
United States invasion of Panama The United States invasion of Panama, codenamed Operation Just Cause, lasted over a month between mid-December 1989 and late January 1990. It occurred during the administration of President George H. W. Bush and ten years after the Torrijos– ...
in 1989. The rains also caused an access road to the Centenario Bridge to collapse.


Capacity

The canal handles more vessel traffic than had ever been envisioned by its builders. In 1934 it was estimated that the maximum capacity of the canal would be around 80 million tons per year; as noted above, canal traffic in 2015 reached 340.8 million tons of shipping. To improve capacity, a number of improvements have been made to maximize the use of the locking system: * Implementation of an enhanced locks lighting system; * Construction of two tie-up stations in Culebra Cut; * Widening Culebra Cut from ; * Improvements to the tugboat fleet; * Implementation of the carousel lockage system in Gatun locks; * Development of an improved vessel scheduling system; * Deepening of Gatun Lake navigational channels from PLD; * Modification of all locks structures to allow an additional draft of about ; * Deepening of the Pacific and Atlantic entrances; * Construction of a new spillway in Gatun, for flood control. These improvements enlarged the capacity from 300 million PCUMS (2008) to 340 PCUMS (2012). These improvements were started before the new locks project, and are complementary to it.


Competition

The canal faces increasing competition from other quarters. Because canal tolls have risen as ships have become larger, some critics have suggested that the Suez Canal is now a viable alternative for cargo en route from Asia to the US East Coast. The Panama Canal, however, continues to serve more than 144 of the world's trade routes and the majority of canal traffic comes from the "all-water route" from Asia to the US East and Gulf Coasts. On June 15, 2013, Nicaragua awarded the Hong Kong-based HKND Group a 50-year concession to develop a canal through the country. The increasing rate of melting of ice in the Arctic Ocean has led to speculation that 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 ...
or
Arctic Bridge The Arctic Bridge or Arctic Sea Bridge is a seasonal sea route approximately long linking Russia to Canada, specifically the Russian port of Murmansk to the Hudson Bay port of Churchill, Manitoba. Description Churchill is the only principal se ...
may become viable for commercial shipping. This route would save on the route from Asia to Europe compared with the Panama Canal, possibly leading to a diversion of some traffic to that route. However, such a route is beset by unresolved territorial issues and would still hold significant problems owing to ice.


Water issues

Gatun Lake is filled with rainwater, and the lake accumulates excess water during wet months. The water is lost to the oceans at a rate of per downward lock cycle. Since a ship will have to go upward to Gatun Lake first and then descend, a single passing will cost double the amount; but the same waterflow cycle can be used for another ship passing in the opposite direction. The ship's submerged volume is not relevant to this amount of water. During the
dry season The dry season is a yearly period of low rainfall, especially in the tropics. The weather in the tropics is dominated by the tropical rain belt, which moves from the northern to the southern tropics and back over the course of the year. The te ...
, when there is less rainfall, there is also a shortage of water in Gatun Lake. As a signatory to the
United Nations Global Compact The United Nations Global Compact is a non-binding United Nations pact to encourage businesses and firms worldwide to adopt sustainable and socially responsible policies, and to report on their implementation. The UN Global Compact is a princ ...
and member of the World Business Council for Sustainable Development, the ACP has developed an environmentally and socially sustainable program for expansion, which protects the aquatic and terrestrial resources of the canal watershed. The expansion guarantees the availability and quality of water resources by using water-saving basins at each new lock. These water-saving basins diminish water loss and preserve freshwater resources along the waterway by reusing water from the basins into the locks. Each lock chamber has three water-saving basins, which reuse 60 percent of the water in each transit. There are a total of nine basins for each of the two lock complexes, and a total of 18 basins for the entire project. The mean sea level at the Pacific side is about higher than that of the Atlantic side due to differences in ocean conditions such as water density and weather.


Third set of locks project (expansion)

As demand is rising for efficient global shipping of goods, the canal is positioned to be a significant feature of world shipping for the foreseeable future. However, changes in shipping patterns —particularly the increasing numbers of larger-than-Panamax ships— necessitated changes to the canal for it to retain a significant
market share Market share is the percentage of the total revenue or sales in a market that a company's business makes up. For example, if there are 50,000 units sold per year in a given industry, a company whose sales were 5,000 of those units would have a ...
. In 2006 it was anticipated that by 2011, 37 percent of the world's container ships would be too large for the present canal, and hence a failure to expand would result in a significant loss of market share. The maximum sustainable capacity of the original canal, given some relatively minor improvement work, was estimated at 340 million PC/UMS tons per year; it was anticipated that this capacity would be reached between 2009 and 2012. Close to 50 percent of transiting vessels were already using the full width of the locks. An enlargement scheme similar to the 1939 Third Lock Scheme, to allow for a greater number of transits and the ability to handle larger ships, had been under consideration for some time, was approved by the government of Panama, The cost was estimated at , and the expansion allowed to double the canal's capacity, allowing more traffic and the passage of longer and wider
Post-Panamax Panamax and New Panamax (or Neopanamax) are terms for the size limits for ships travelling through the Panama Canal. The limits and requirements are published by the Panama Canal Authority (ACP) in a publication titled "Vessel Requirements". ...
ships. The proposal to expand the canal was approved in a national referendum by about 80 percent on October 22, 2006. The canal expansion was built between 2007 and 2016. The expansion plan had two new flights of locks built parallel to, and operated in addition to, the old locks: one east of the existing Gatun locks, and one southwest of the Miraflores locks, each supported by approach channels. Each flight ascends from sea level directly to the level of Gatun Lake; the existing two-stage ascent at Miraflores and Pedro Miguel locks was not replicated. The new lock chambers feature sliding gates, doubled for safety, and are long, wide, and deep. This allows the transit of vessels with a beam of up to , an overall length of up to and a draft of up to , equivalent to a container ship carrying around 12,000 containers, each in length (TEU). The new locks are supported by new approach channels, including a channel at Miraflores from the locks to the Gaillard Cut, skirting Miraflores Lake. Each of these channels are wide, which will require post-Panamax vessels to navigate the channels in one direction at a time. The Gaillard Cut and the channel through Gatun Lake were widened to at least on the straight portions and at least on the bends. The maximum level of Gatun Lake was raised from to . Each flight of locks is accompanied by nine water reutilization basins (three per lock chamber), each basin being about wide, long and deep. These gravity-fed basins allow 60 percent of the water used in each transit to be reused; the new locks consequently use 7 percent less water per transit than each of the existing lock lanes. The deepening of Gatun Lake and the raising of its maximum water level also provide capacity for significantly more water storage. These measures are intended to allow the expanded canal to operate without constructing new reservoirs. The estimated cost of the project is . The project was designed to allow for an anticipated growth in traffic from 280 million PC/UMS tons in 2005 to nearly 510 million PC/UMS tons in 2025. The expanded canal will have a maximum sustainable capacity of about 600 million PC/UMS tons per year. Tolls will continue to be calculated based on vessel tonnage, and in some cases depend on the locks used. An article in the February 2007 issue of ''Popular Mechanics'' magazine described the engineering aspects of the expansion project. There is also a follow-up article in the February 2010 issue of ''Popular Mechanics''. On September 3, 2007, thousands of
Panamanians Panamanians ( Spanish: ''Panameños'') are people identified with Panama, a transcontinental country in Central America (a region within North America) and South America, whose connection may be residential, legal, historical, or cultural. For ...
stood across from Paraíso Hill in Panama to witness a huge initial
explosion An explosion is a rapid expansion in volume associated with an extreme outward release of energy, usually with the generation of high temperatures and release of high-pressure gases. Supersonic explosions created by high explosives are known ...
and launch of the Expansion Program. The first phase of the project was the dry
excavations In archaeology, excavation is the exposure, processing and recording of archaeological remains. An excavation site or "dig" is the area being studied. These locations range from one to several areas at a time during a project and can be condu ...
of the wide
trench A trench is a type of excavation or in the ground that is generally deeper than it is wide (as opposed to a wider gully, or ditch), and narrow compared with its length (as opposed to a simple hole or pit). In geology, trenches result from eros ...
connecting the Gaillard Cut with the
Pacific coast Pacific coast may be used to reference any coastline that borders the Pacific Ocean. Geography Americas Countries on the western side of the Americas have a Pacific coast as their western or southwestern border, except for Panama, where the Pac ...
, removing 47 million cubic meters of earth and rock. By June 2012, a 30 m
reinforced concrete Reinforced concrete (RC), also called reinforced cement concrete (RCC) and ferroconcrete, is a composite material in which concrete's relatively low tensile strength and ductility are compensated for by the inclusion of reinforcement having hig ...
monolith had been completed, the first of 46 such monoliths which will line the new Pacific-side lock walls. By early July 2012, however, it was announced that the canal expansion project had fallen six months behind schedule, leading expectations for the expansion to open in April 2015 rather than October 2014, as originally planned. By September 2014, the new gates were projected to be open for transit at the "beginning of 2016". It was announced in July 2009 that the Belgian dredging company
Jan De Nul Jan De Nul Group is a Belgian family-owned company, with the financial headquarters in Luxembourg, that provides services relating to the construction and maintenance of maritime infrastructure on an international basis. Its main focus is dredging ...
, together with a consortium of contractors consisting of the Spanish Sacyr Vallehermoso, the Italian
Impregilo Webuild SpA (formerly Salini Impregilo SpA) () is an Italian industrial group specialised in the construction and civil engineering business headquartered in Milan. The company was formally founded in 2014 as the result of the merger by incorporat ...
, and the Panamanian company Grupo Cusa, had been awarded the contract to build the six new locks for US$3.1 billion, which was one billion less than the next highest competing bid due to having a concrete budget 71 percent smaller than that of the next bidder and allotted roughly 25 percent less for steel to reinforce that concrete. The contract resulted in $100 million in dredging works over the next few years for the Belgian company and a great deal of work for its construction division. The design of the locks is a carbon copy of the Berendrecht Lock, which is 68 m wide and 500 m long, making it the second largest lock in the world after the Kieldrecht lock in the port of Antwerp, Belgium. Completed in 1989 by the
Port of Antwerp The Port of Antwerp-Bruges is the port of the City of Antwerp. It is located in Flanders (Belgium), mainly in the province of Antwerp but also partially in the province of East Flanders. It is a seaport in the heart of Europe accessible to ...
, which De Nul helped build, the company still has engineers and specialists who were part of that project. In January 2014, a contract dispute threatened the progress of the project. There was a delay of less than two months however, with work by the consortium members reaching goals by June 2014. In June 2015, flooding of the new locks began: first on the Atlantic side, then on the Pacific; by then, the canal's re-inauguration was slated for April 2016. On March 23, 2016, the expansion inauguration was set for June 26, 2016. The new locks opened for commercial traffic on 26 June 2016, and the first ship to cross the canal using the third set of locks was a modern New Panamax vessel, the Chinese-owned container ship ''Cosco Shipping Panama''. The original locks, now over 100 years old, allow engineers greater access for maintenance, and are projected to continue operating indefinitely. The total cost is unknown since the expansion's contractors are seeking at least an addition from the canal authority due to excess expenses.


Competitive projects


Nicaragua canal

On July 7, 2014, Wang Jing, chairman of the HK Nicaragua Canal Development Investment Co. Ltd. (HKND Group) advised that a route for Nicaragua's proposed canal had been approved. The construction work was projected by HKND to begin in 2014 and take 5 years, although there had been little progress before the project's abandonment. The Nicaraguan parliament approved plans for the canal through Nicaragua and according to the deal, the company would have been responsible for operating and maintaining the canal for a 50-year period. By May 2017, no concrete action had been reportedly taken constructing the canal and further doubts were expressed about its financing. In February 2018, analysts widely viewed the project as defunct, though the head of the project insisted work was on-going and HKND retained the legal rights to the concession for the canal as well as side projects. Despite HKND vanishing in April 2018, the Nicaraguan government indicates that it will continue with the 908 km2 (351 sq mi) dry land expropriations within Nicaragua, under land expropriation Canal Law 840.


Colombia rail link

In 2011, Colombia's then-president
Juan Manuel Santos Juan Manuel Santos Calderón (; born 10 August 1951) is a Colombian politician who was the President of Colombia from 2010 to 2018. He was the sole recipient of the 2016 Nobel Peace Prize. An economist by profession and a journalist by trade, ...
announced a proposal for a railway between Colombia's Pacific and Caribbean coasts. However, in 2015 the director of the Colombia-China Chamber of Commerce said the proposal "was mentioned in 2011 and subsequently had minimal relevance".


Northwest Passage

Climate change has thinned much of the ice that in the past made this route between the Atlantic and Pacific oceans impassable. Satellite navigation can help monitor location of the ice which remains, further easing transit. A few ships have successfully crossed the previously impossible route since 2000.


Other projects

Individuals, companies, and governments have explored the possibility of constructing deep water ports and rail links connecting coasts as a "dry canal" in Guatemala, Costa Rica, and El Salvador/Honduras. However, plans to construct these sea-rail-sea links have yet to materialize.


Master Key to Panama Canal and Honorary Pilots

During the last one hundred years, the Panama Canal Authority has granted membership in the "Esteemed Order of Bearers of the Master Key of the Panama Canal" and appointed a few "Honorary Lead Pilots" to employees, captains and dignitaries. One of the most recent of these were U.S. Federal Maritime Commissioner, Louis Sola, who was awarded for his work for supporting seafarers during the COVID-19 pandemic and previously transiting the canal more than 100 times. Another recent award was to Commodore Ronald Warwick, a former
Master Master or masters may refer to: Ranks or titles * Ascended master, a term used in the Theosophical religious tradition to refer to spiritually enlightened beings who in past incarnations were ordinary humans *Grandmaster (chess), National Master ...
of the
Cunard Line Cunard () is a British shipping and cruise line based at Carnival House at Southampton, England, operated by Carnival UK and owned by Carnival Corporation & plc. Since 2011, Cunard and its three ships have been registered in Hamilton, Berm ...
rs ''
Queen Elizabeth 2 ''Queen Elizabeth 2'' (''QE2'') is a retired British ocean liner converted into a floating hotel. Originally built for the Cunard Line, the ship, named as the second ship named ''Queen Elizabeth'', was operated by Cunard as both a transatlantic ...
'' and ''
RMS Queen Mary 2 RMS ''Queen Mary 2'' (also referred to as the ''QM2'') is a British transatlantic ocean liner. She has served as the flagship of Cunard Line since succeeding ''Queen Elizabeth 2'' in 2004. As of 2022, ''Queen Mary 2'' is the only ocean liner ...
'', who has traversed the Canal more than 50 times, and Senior Captain Raffaele Minotauro, an Unlimited Oceangoing Shipmaster Senior Grade, of the former Italian governmental navigation company known as the "
Italian Line Italian Line and from 1992 Italia Line, whose official name was Italia di Navigazione S.p.A., was a passenger shipping line that operated regular transatlantic services between Italy and the United States, and Italy and South America. During ...
".Martinengo, Angelo
"TOC Conference 2018 Panama. Cenni storici del Canale di Panama", ''[http://www.farodiroma.it/ Faro di Roma]''
, 3 October 2018 (Italian)


See also

*
Ajax (crane barge) Ajax is a floating crane built to move and install the canal locks and other large parts of the Panama canal. Ajax also helped in ship repairs and clearing the canal as needed. Ajax and her identical sister crane, the ''Hercules'', were the larges ...
*
Canal des Deux Mers , canal_length=Canal du Midi Garonne Lateral Canal , max_boat_length= , max_boat_beam= , present_owner= , original_num_locks= , current_num_locks=Canal du Midi 65 locksGaronne Lateral Canal 53 locks , min_elev= , max_elev= , status= , navigation_ ...
* Canal Zone Police *
Corinth Canal The Corinth Canal ( el, Διώρυγα της Κορίνθου, translit=Dhioryga tis Korinthou) is an artificial canal in Greece, that connects the Gulf of Corinth in the Ionian Sea with the Saronic Gulf in the Aegean Sea. It cuts through the ...
*
List of waterways This is a list of waterways, defined as navigable rivers, canals, estuaries, lakes, or firths. In practice, and depending on the language, the term "waterway" covers maritime or inland transport routes, as suggested by "way". Wherever a free- ...
*
Panama Canal Zone The Panama Canal Zone ( es, Zona del Canal de Panamá), also simply known as the Canal Zone, was an unincorporated territory of the United States, located in the Isthmus of Panama, that existed from 1903 to 1979. It was located within the terr ...
*
Suez Canal The Suez Canal ( arz, قَنَاةُ ٱلسُّوَيْسِ, ') is an artificial sea-level waterway in Egypt, connecting the Mediterranean Sea to the Red Sea through the Isthmus of Suez and dividing Africa and Asia. The long canal is a popular ...


References


Further reading


Construction and technical issues

* Brodhead, Michael J. 2012
"The Panama Canal: Writings of the U. S. Army Corps of Engineers Officers Who Conceived and Built It."
US Army Corps of Engineers History Office, Alexandria, VA. * * Jaen, Omar. (2005). Las Negociaciones de los Tratados Torrijos-Carter, 1970–1979 (Tomos 1 y 2). Panama: Autoridad del Canal de Panama. (Obra completa) * Jorden, William J. (1984). ''Panama Odyssey''. 746 pages, illustrated. Austin:
University of Texas Press The University of Texas Press (or UT Press) is a university press that is part of the University of Texas at Austin. Established in 1950, the Press publishes scholarly books and journals in several areas, including Latin American studies, Texan ...
. * * A Project Gutenberg free ebook. * Parker, Matthew. (2007). ''Panama Fever: The Epic Story of One of the Greatest Human Achievements of All Time—The Building of the Panama Canal.'' New York: Doubleday. * Sherman, Gary. "Conquering the Landscape (Gary Sherman explores the life of the great American trailblazer, John Frank Stevens)," History Magazine, July 2008.


Diplomatic and political history

* Gilboa, Eytan. "The Panama Invasion Revisited: Lessons for the Use of Force in the Post Cold War Era." ''Political Science Quarterly'' (1995): 539–562
in JSTOR
* Greene, Julie, ''The Canal Builders: Making America's Empire at the Panama Canal'' (New York: Penguin Press, 2009) * Hogan, J. Michael.
Theodore Roosevelt and the Heroes of Panama
''Presidential Studies Quarterly 19'' (1989): 79–94. * LaFeber, Walter. ''The Panama Canal: the crisis in historical perspective'' (Oxford University Press, 1978) * Long, Tom.
Putting the canal on the map: Panamanian Agenda-setting and the 1973 Security Council Meetings
" ''Diplomatic History'', 38, No. 2 (2014): pp. 431–455. * Major, John. ''Prize Possession: The United States and the Panama Canal, 1903–1979'' (1993) * Maurer, Noel, and Carlos Yu. ''The Big Ditch: How America Took, Ran, and Ultimately Gave Away the Panama Canal'' (Princeton University Press, 2010); 420 pp.  . Econometric analysis of costs ($9 billion in 2009 dollars) and benefits to US and Panama *Mellander, Gustavo A., Mellander, Nelly, Charles Edward Magoon: The Panama Years. Río Piedras, Puerto Rico: Editorial Plaza Mayor. ISBN 1-56328-155-4. OCLC 42970390. (1999) *Mellander, Gustavo A., The United States in Panamanian Politics: The Intriguing Formative Years." Danville, Ill.: Interstate Publishers. OCLC 138568. (1971) * Sánchez, Peter M. ''Panama Lost? U.S. Hegemony, Democracy and the Canal'' (University Press of Florida, 2007), 251 pp, * Sánchez, Peter M. "The end of hegemony? Panama and the United States." ''International Journal on World Peace'' (2002): 57–89
in JSTOR


External links



—Has a simulation showing how the canal works *
Making the Dirt Fly, Building the Panama Canal
' Smithsonian Institution Libraries
Canalmuseum
History, Documents, Photographs and Stories
Early stereographic images of the construction
University of California
A. B. Nichols Panama Canal Collection at the Linda Hall Library
Archival collection of maps, blueprints, photographs, letters, and other documents, collected b
Aurin B. Nichols
, an engineer who worked on the canal project through from 1899 until its completion.
Newspaper articles and clippings about the Panama Canal at Newspapers.com

Panama Canal Collection
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at nationsonline.org {{Authority control Canals in Panama Ship canals Water transport in Panama Coasts of Panama Economy of Panama Geography of Panama History of Panama Macro-engineering Transport infrastructure in Panama Canals opened in 1914 1914 establishments in Panama 1914 establishments in the United States 1914 in Central America Panamanian coasts of the Caribbean Sea Panamanian coasts of the Pacific Ocean Historic Civil Engineering Landmarks Historic American Engineering Record in the former Panama Canal Zone 1890s in Panama 1880s in Panama