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'{{Infobox lake | name = Gatun Lake | image = Gatun Lake.jpg | caption = Ships follow marked channels among the hilltop islands | image_bathymetry = | caption_bathymetry = | location = | coords = {{coord|9|11|N|79|53 |W|region:PA_type:waterbody_source:dewiki|display=inline,title}} | type = [[artificial lake]] | inflow = [[Chagres River]] | outflow = | catchment = | basin_countries = Panama | length = | width = | area = {{convert|425|km2|abbr=on}} | depth = | max-depth = | volume = {{convert|425|hm3|acre.ft|abbr=on}}<ref>{{cite journal |last=Hulman |first=Lewis G. |date=1972 |title=System Relationships a Panama Canal Water Supply Study |journal=Water Resources Research |volume=8 |issue=3 |pages=774–778 |doi=10.1029/WR008i003p00769 }}</ref> | residence_time = | shore = | elevation = {{convert|26|m|abbr=on}} | islands = [[Barro Colorado|Isla Barro Colorado]], [[Isla gatun, panama|Isla Gatun]], [[Isla Falta Calzado]], [[Isla Tres Perros]] | cities = }} '''Gatun Lake''' ({{lang-es|Lago Gatún}}) is a large [[artificial lake]] to the south of [[Colón, Panama]]. It forms a major part of the [[Panama Canal]], carrying ships for {{convert|33|km|mi|abbr=on}} of their transit across the [[Isthmus of Panama]]. The lake was created between 1907 and 1913 by the building of the [[Gatun Dam]] across the [[Chagres River]]. At the time it was created, Gatun Lake was the largest man-made lake in the world. Gatun Dam was also the largest of its kind. == Description == The lake is situated in the valley of the [[Chagres River]]. It was formed, and the river widened and deepened, by the construction of the [[Gatun Dam]] about {{convert|10|km|mi|abbr=on}} from the river's mouth in the [[Caribbean Sea]] in 1907–1913. The geography of the area was ideal for the creation of a large lake here; the hills bordering the valley of the Chagres open up widely around the area of the lake, but come together to form a gap just over {{convert|2|km|mi|abbr=on}} wide at the location of the dam. The damming of the river flooded the originally wooded valley; almost a century later, the stumps of old mahogany trees can still be seen rising from the water, and submerged snags form a hazard for any small vessels that wander off the marked channels. Gatun Lake has an area of {{convert|425|km2|sqmi|abbr=on}} at its normal level of 26&nbsp;m (85&nbsp;ft) above sea level; it stores 5.2 cubic kilometres (183,000,000,000&nbsp;ft³) of water, which is about as much as the Chagres River brings down in an average year. With the creation of the lake many hilltops became islands. The biggest and best known of them is [[Barro Colorado Island]], home of the world-famous [[Smithsonian Tropical Research Institute]] (STRI). The lake has given its name to the [[Gatun structure]], which may be an eroded [[impact crater]]. == Role in the canal == [[File:Panama Canal Map EN.png|thumb|The Panama Canal and the location of Gatun Lake]] Gatun Lake forms a major component of the [[Panama Canal]]; the lake, including the flooded arm extending up the Chagres River, makes up {{convert|32.7|km|mi|sigfig=3|abbr=on}} of the raised part of the waterway, the other part being the {{convert|12.6|km|mi|sigfig=3|abbr=on}} [[Culebra Cut]]. The canal follows a clearly marked route around the lake's islands, following the deeper water south from Gatun Locks, and then east. A small "shortcut" channel, the "Banana Cut", runs between the islands, providing a slightly shorter route through the lake; this is used by canal launches and yachts to cut a little time off the crossing, and to avoid the heavy ship traffic. The lake is also important as a [[reservoir (water)|reservoir]] of water for the operation of the [[Panama Canal Locks|canal locks]]. Each time a ship transits the canal {{convert|202000|m3|usgal|sigfig=3|abbr=on}} of water is passed from the lake into the sea; with over 14,000 vessel transits per year, this represents a very large demand for water. Since rainfall is seasonal in [[Panama]], the lake acts as a water store, allowing the canal to continue operation through the dry season. A major factor in water regulation is the ability of the rainforest in the lake's [[Drainage basin|watershed]] to absorb rainfall, releasing it gradually into the lake. However, significant [[deforestation]] of the watershed has cleared away much of the vegetation, and reduced the area's water capacity. This has resulted in falling water levels in the lake during the dry season. Coupled with the massive increase in canal traffic since its opening, and the resultant increase in water usage, this is an ongoing problem for the canal (see [[Panama Canal#Water issues|Panama Canal: Water issues]]). ==Gatun Lake supplementary benefits== Created in 1913 by the damming of the Chagres River, Gatun Lake is an essential part of the Panama Canal which forms a water passage between the Atlantic Ocean and the Pacific Ocean, permitting ship transit in both directions. At the time it was formed, Gatun Lake was the largest man-made lake in the world. The impassable rain-forest around Gatun Lake has been the best defense of the Panama Canal. Today these areas have endured practically unscathed by human interference and are one of the few accessible areas on [[Earth]] where various native Central American animal and plant species can be observed undisturbed in their natural habitat. [[Barro Colorado Island]], which was established for scientific study when the lake was formed and is today operated by the [[Smithsonian Institution]], is the largest island on Gatun Lake. Many of the most important ground breaking scientific and biological discoveries of the tropical animal and plant kingdom originated here. Lake Gatun encompasses approximately {{convert|180|sqmi|km2}}, a tropical ecological zone part of the Atlantic Forest Corridor and [[ecotourism]] on Gatun Lake has become a worthwhile industry for Panamanians. Gatun Lake also serves to provide the millions of gallons of water necessary to operate the Panama Canal locks each time a ship passes through and provides drinking water for Panama City and Colon. Angling is one of the primary recreational pursuits on Gatun Lake. Non-native [[Peacock Bass]] were introduced by accident to Gatun Lake around 1967<ref>{{cite journal| journal=Science |title=Species Introduction in a Tropical Lake |first1=Thomas M. |last1=Zaret |first2=R.T. |last2=Paine |volume=182|issue=4111 |pages=449–455 |date = 2 November 1973 |doi=10.1126/science.182.4111.449 |pmid=17832455}}</ref> by a local businessman,<ref>{{cite journal| journal=Panama Canal Review |title=Peacock Bass: Fun to Catch, Fine to Eat |pages=11 |volume = February 1971 |url=https://archive.org/stream/panamacanalrevie1971pana#page/11/mode/1up |accessdate=2012-04-30}}</ref> and have since flourished to become the dominant angling game fish in Gatun Lake. Locally called Sargento, and believed to be the species Cichla Pleiozona,<ref>{{cite web |url=http://www.panamafishingandcatching.com/gatun.htm |accessdate=2012-04-30 |title=Gatun Lake Peacock Bass Fishing Charters}}</ref> these peacock bass are not a native game fish of Panama but originate from the Amazon, Rio Negro and Orinoco river basins of South America where they are called Tucanare or Pavon and are considered a premier game fish. == Notes == {{Reflist|1}} == References == * [http://www.czbrats.com/Menus/bennett.htm ''History Of The Panama Canal''], by Ira E. Bennett * [http://www.czbrats.com/Builders/Goethals/contents.htm ''The Panama Canal''], by Colonel George W. Goethals {{Panama Canal}} [[Category:Panama Canal]] [[Category:Lakes of Panama]] [[Category:Reservoirs in Panama]] [[Category:Colón Province]] [[Category:Bifurcation lakes]]'