59-552: Shannon River may refer to: River Shannon , Ireland Shannon River (Minnesota) , located in Saint Louis County, Minnesota Shannon River (Tasmania) , a tributary of Ouse River (Tasmania) Shannon River (Western Australia) , a river in Western Australia . [REDACTED] Index of articles associated with the same name This set index article includes
118-589: A land settlement , or plantation after his conquest of Ireland Oliver Cromwell reputedly said the remaining Irish landowners would go to "Hell or Connacht", referring to their choice of forced migration west across the river Shannon, or death, thus freeing up the eastern landholdings for the incoming English settlers. In the Williamite War in Ireland (1689–91), the Jacobites also retreated behind
177-525: A 12.8 km (4.9 sq mi) immediate pot catchment area covering the slopes of Cuilcagh. This area includes Garvah Lough, Cavan, 2.2 km (1.4 mi) to the northeast, drained by Pollnaowen . Further sinks that source the pot include Pollboy and, through Shannon Cave , Pollahune in Cavan and Polltullyard and Tullynakeeragh in County Fermanagh , Northern Ireland . The highest point in
236-628: A Breacaun to fish between Limerick City and Plassey until 1929. In 1929, the construction of a dam at Ardnacrusha severely impacted salmon breeding and that, and the introduction of quotas, had by the 1950s caused salmon fishing to cease. However, recreational fishing still goes on. Further down the Shannon Estuary at Kilrush the Currach was used to catch herring as well as drift netting for salmon. Dublin City Council published
295-476: A freshwater river, is only about 161 km (100 mi) long. Apart from being Ireland's longest river, the Shannon is also, by far, Ireland's largest river by flow . It has a long-term average flow rate of 208.1 m /s (7,350 cu ft/s) (at Limerick ). This is double the flow rate of Ireland's second highest-volume river, the short River Corrib (104.8 m /s [3,700 cu ft/s]. If
354-474: A goddess in a river is common in Irish mythology and typically represents the dissolving of her divine power into the water, which then gives life to the land". A small myth about Sionann tells that the legendary hunter-warrior Fionn mac Cumhaill was attacked by a number of other warriors at Ballyleague, near north Lough Ree. It is said that when Fionn was near to defeat, Sionnan rescued him, and he arrived with
413-421: A list of related items that share the same name (or similar names). If an internal link incorrectly led you here, you may wish to change the link to point directly to the intended article. Retrieved from " https://en.wikipedia.org/w/index.php?title=Shannon_River&oldid=1069647655 " Category : Set index articles Hidden categories: Articles with short description Short description
472-560: A major physical barrier between east and west, with fewer than thirty-five crossing points between the village of Dowra in the north and Limerick city in the south. By tradition the Shannon is said to rise in the Shannon Pot , a small pool in the townland of Derrylahan on the slopes of Cuilcagh Mountain in County Cavan , Republic of Ireland , from where the young river appears as a small trout stream. Surveys have defined
531-529: A plan in 2011 to supply up to 350 million litres of water a day from Lough Derg to Dublin city and region. In 2016 the Parteen Basin to the south of lough was chosen as the proposed site of extraction. Water would be pumped to a break pressure tank Knockanacree near Cloughjordan in County Tipperary and gravity fed from there by pipeline to Dublin. Shannon Cave Shannon Cave
590-420: A section of the choke collapsed on Rev. George Pitt while he attempted to force a passage at river level. He became trapped for 10 hours, but was freed after a major rescue effort. By 1990 the explorers had passed the newly named George's Choke. The end of the cave was reached, 400 metres (1,300 ft) downstream, at the terminal sump (sump 3) beneath another large boulder choke, and the extension to this point
649-472: A short distance. Since the cave is undergoing active exploration , there remain many issues to be sorted out and the sinks for many of these inlets remains unclear. The stream passage itself is of considerable proportions in parts, but also contains many higher level fossil passages which have been deserted by the stream. The cave contains numerous calcite formations, with large amounts of helictites in places. Boulder chokes are frequent with several parts of
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#1732772300482708-596: A topography quite different from the long upper reaches. Here the river falls by 30 m (98 ft) in only 20 km (12 mi). William Ockenden, also from England, was placed in charge of works on this stretch in 1757 and spent £12,000 over the next four years, without fully completing the task. In 1771 parliament handed over responsibility to the Limerick Navigation Company , with a grant of £6,000 to add to their subscriptions of £10,000. A lateral canal, 8 km (5 mi) long with six locks,
767-555: Is an active stream passage cave which straddles the border of County Fermanagh , Northern Ireland and County Cavan in the Republic of Ireland . At 130 metres (430 ft) vertical depth, it stands joint sixth with Poulnagree in County Clare in the deepest caves on the island of Ireland . The cave is recorded at 5.4 kilometres (3.4 mi) in length (making it the sixth-longest on the island of Ireland), but exploration
826-584: Is different from Wikidata All set index articles River Shannon The River Shannon ( Irish : an tSionainn, Abhainn na Sionainne or archaic an tSionna ) is the major river on the island of Ireland , and at 360 km (224 miles) in length, is the longest river in the British Isles . It drains the Shannon River Basin , which has an area of 16,900 km (6,525 sq mi), – approximately one fifth of
885-488: Is ongoing and further passage is expected to be found. The cave consists in the main of a large mainstream passage running to a terminal sump. The water flowing in the cave has been dye traced to Shannon Pot , two kilometres to the west of the terminal sump, which is the traditional source of the River Shannon . Inlets to the main passage are numerous. Some, such as the large "Mistake Passage" have been pushed only
944-407: Is that there is no particular end to a river that empties into an estuary. The 344 km length relates to the distance between Shannon Pot and a line between Kerry Head and Loop Head , the furthest reaches of the land. (It also assumes the current shipping route via Ardnacrusha, which takes 7 km (4.3 mi) off the distance.) The 280 km distance finishes where the Shannon estuary joins
1003-406: The 102 km ( 63 + 1 ⁄ 2 mi) tidal estuary from its total length of 360 km (224 mi), if one also excludes the lakes ( L. Derg 39 km (24 mi), L. Ree 29 km (18 mi), L. Allen 11 km (7 mi) plus L. Boderg , L. Bofin , L. Forbes , L. Corry ) from the Shannon's freshwater flow of 258 km ( 160 + 1 ⁄ 2 mi), the Shannon, as
1062-788: The River Suck and canal, while Boyle is connected via the Boyle canal, the river Boyle and Lough Key . There is also the Ardnacrusha canal connected with the Ardnacrusha dam south of Lough Derg. Near Limerick, a short canal connects Plassey with the Abbey River , allowing boats to bypass the Curraghower Falls, a major obstacle to navigation. Lecarrow village in County Roscommon is connected to Lough Ree via
1121-516: The Salmon of Wisdom who swam there, becoming the wisest being on Earth, in others, she merely drank from the well. At any rate, the waters of the well are said to have burst forth, drowning Sionann, and carrying her out to sea. Notably, a similar tale is told of Boann and the River Boyne . It is said that Sionann thus became the goddess of the river. Patricia Monaghan notes that "The drowning of
1180-694: The Shannon River Basin which have headwaters that are further in length (from source to mouth) than the Shannon Pot source's length of 360.5 km (224 miles), such as the Owenmore River , total length 372 km (231 mi) in County Cavan and the Boyle River , total length 392.1 km (243.6 mi) with its source in County Mayo . The River Shannon is a traditional freshwater river for about 45% of its total length. Excluding
1239-771: The Lecarrow canal. Jamestown Canal and the Albert Lock form a link between the River Shannon, from south of Jamestown , to Lough Nanoge to the south of Drumsna . According to Irish mythology , the river was named after a woman (in many sources a member of the Tuatha de Danaan ) named Sionann (older spelling forms: Sínann or Sínand), the granddaughter of Manannán mac Lir . She went to Connla's Well to find wisdom, despite having been warned not to approach it. In some sources she, like Fionn mac Cumhaill , caught and ate
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#17327723004821298-583: The Limerick Vikings clashed with those of Dublin on Lough Ree and were defeated. In the 17th century, the Shannon was of major strategic importance in military campaigns in Ireland, as it formed a physical boundary between the east and west of the country. In the Irish Confederate Wars of 1641–53, the Irish retreated behind the Shannon in 1650 and held out for two further years against English Parliamentarian forces. In preparing
1357-563: The Reyfad Group, the cavers' collective responsible for exploring the Reyfad system. The entrance was made in a shakehole adjacent to the sink point of the Hune (pronounced "honey") stream, and close the border in County Cavan. This entrance became known as "Pollahune". The initial route was dug through a highly unstable area of glacial fill, making it extremely treacherous. Once in the cave
1416-489: The Shannon Navigation Act of 1835 appointing five Commissioners for the improvement of navigation and drainage who took possession of the whole navigation. Over the next 15 years, many improvements were made but in 1849 a railway was opened from Dublin to Limerick and the number of passengers fell dramatically. Freight, which had risen to over 100,000 long tons (100,000 tonnes) per year, was also halved. But
1475-621: The Shannon after their defeat at the Battle of the Boyne in 1690. Athlone and Limerick, cities commanding bridges over the river, saw bloody sieges. (See Sieges of Limerick and Siege of Athlone .) As late as 1916, the leaders of the Easter Rising planned to have their forces in the west "hold the line of the Shannon". However, in the event, the rebels were neither well enough armed nor equipped to attempt such an ambitious policy. Though
1534-614: The Shannon has always been important for navigation in Ireland, there is a fall of only 18 m (59 ft) in its first 250 km (160 mi). Consequently, it has always been shallow, with 0.5 m (1 ft 8 in) depths in various places. The first serious attempt to improve navigability came in 1755 when the Commissioners of Inland navigation ordered Thomas Omer , a new immigrant from England, possibly of Dutch origin, to commence work. He worked at four places between Lough Derg and Lough Ree where natural navigation
1593-462: The Shannon is a major river by the time it leaves Lough Ree with an average flow rate (at Athlone weir) of 98 m /s (3,500 cu ft/s), larger than any of the other Irish rivers' total flow (apart from the River Corrib at Galway ). The main flow of the river is affected by some distributaries along its course, many of which rejoin it downstream. The Abbey River flows around
1652-548: The Stone of Sionann, threw the stone, and the warriors were immediately killed. It further says that Fionn was afraid of the power of the stone and threw it into the river, where it remains at a low ford , and that if a woman named Be Thuinne finds it, then the world's end is near. The Shannon reputedly hosts a river monster named Cata, the first known mention being in the medieval Book of Lismore . In this manuscript, we are told that Senán , patron saint of County Clare , defeated
1711-538: The area of Ireland. Known as an important waterway since antiquity, the Shannon first appeared in maps by the Graeco-Egyptian geographer Ptolemy ( c. 100 – c. 170 AD). The river flows generally southwards from the Shannon Pot in County Cavan before turning west and emptying into the Atlantic Ocean through the 102.1 km (63.4 mi) long Shannon Estuary . Limerick city stands at
1770-644: The bridges high enough for navigation. Since then the leisure trade has steadily increased, becoming a great success story. There are also many canals connecting with the River Shannon. The Royal Canal and the Grand Canal connect the Shannon to Dublin and the Irish Sea . It is linked to the River Erne and Lough Erne by the Shannon–Erne Waterway . Ballinasloe is linked to the Shannon via
1829-638: The catchment is a spring at Tiltinbane on the western end of the Cuilcagh mountain ridge. From the Shannon Pot, the river subsumes a number of tributaries before replenishing Lough Allen at its head. The river runs through or between 11 of Ireland's counties , subsuming the tributary rivers Boyle , Inny , Suck , Mulkear and Brosna , among others, before reaching the Shannon Estuary at Limerick . Many different values have been given for
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1888-590: The cave being quite unstable, especially the JCP passage. While the location of the entrance to the cave is in County Fermanagh , the majority of the cave lies under County Cavan . The original entrance to the cave was in Cavan; however, this is now inaccessible. The current entrance of Polltullyard is located north of the Marlbank area of Fermanagh, high in the moors. The cave was discovered in August 1980 by members of
1947-473: The cavers encountered a "main" streamway into which the Hune flowed, with the upstream section leading to "JCP Passage" and the downstream section passing another significant inlet, "Mistake Passage". By the end of August, the team had progressed past several boulder chokes and explored cave passages some 1.6 kilometres (1 mi) in length. Downstream, the team reached a terminus at a prominent boulder choke, through which they attempted to dig. In October 1980
2006-425: The choke. This began with a short stretch of passage leading to sump 4, which was then bypassed from above, leading to 450 metres (1,480 ft) of unbroken canyon passage. The extension eventually terminated at a new terminal sump. The new section was named "St. Patrick's Extension", and the canyon passage named "Paddy's Parade". The sump, number 5 in the system, was named "Long Way From Home". "Downstream of sump 4
2065-481: The discharges from all of the rivers and streams into the Shannon Estuary (including the rivers Feale 34.6 m /s [1,220 cu ft/s], Maigue 15.6 m /s [550 cu ft/s], Fergus 25.7 m /s [910 cu ft/s], and Deel 7.4 m /s [260 cu ft/s]) are added to the discharge at Limerick, the total discharge of the River Shannon at its mouth at Loop Head reaches 300 m /s (11,000 cu ft/s). Indeed,
2124-460: The discovery of a reduced eel population. This scheme ensures safe passage for young eels between Lough Derg and the Shannon estuary. Though the Shannon estuary fishing industry is now depleted, at one time it employed hundreds of men along its length. At Limerick , fishermen based on Clancy's Strand used the Gandelow to catch Salmon . The Abbey Fishermen used a net and a boat type known as
2183-402: The discovery of a tight cross-rift intercepting a section of "Paddy's Parade" at right-angles. The dry, tightly meandering rift, the "Snake Escape", was followed for 30 metres (98 ft) to a 10-metre (33 ft) upward pitch , from the top of which led 70 metres (230 ft) of crawling passage to a number of deep pitch heads. The last of these pitches was found to take a small stream, which
2242-408: The end of the last glacial period . Ptolemy 's Geography (2nd century AD) described a river called Σηνος ( Sēnos ) from PIE * sai -/ sei - 'to bind', the root of English sinew and Irish sin ‘ collar ’, referring to the long and sinuous estuary leading up to Limerick. Vikings settled in the region in the 10th century and used the river to raid the rich monasteries deep inland. In 937
2301-573: The estuary of the River Fergus , close to Shannon Airport . Longer claimed lengths emerged before the use of modern surveying instruments. At a total length of 360.5 km (224 miles), it is the longest river in Ireland. That the Shannon is the longest river in the British Isles was evidently known in the 12th century, although a map of the time showed this river as flowing out of the south of Ireland. There are some tributaries within
2360-435: The last trip into Shannon Cave. In 2007, after two years' work digging and stabilising, George's Choke was passed. The explorers reached the terminal sump, the first people to do so in twelve years. A new dig began on a balcony above the terminal sump, attempting to push a route through the boulder choke, but progress was slow and the choke proved unstable. In early 2008 a team of British cave divers were invited over to dive
2419-418: The length of the Shannon. A traditional value is 390 km (240 mi). An official Irish source gives a total length of 360.5 km (224.0 mi) (being 258.1 km [160.4 mi] fresh and 102.1 km [63.4 mi] tidal). Some Irish guides now give 344 km (214 mi). Some academic sources give 280 km (170 mi), although most will refuse to give a number. The reason
Shannon River - Misplaced Pages Continue
2478-591: The lower Shannon above Limerick. The old Killaloe to Limerick canal with its five locks was abandoned and the head race constructed from Lough Derg also served for navigation. A double lock was provided at the dam. In the 1950s traffic began to fall and low fixed bridges would have replaced opening bridges but for the actions of the Inland Waterways Association of Ireland which persuaded the Tánaiste to encourage passenger launches, which kept
2537-411: The monster at Inis Cathaigh . Cata is described as a large creature with a horse's mane, gleaming eyes, thick feet, nails of iron, and a whale's tail. Another story has an oilliphéist flee its home in the Shannon, upon hearing that Saint Patrick has arrived to remove its kind from Ireland. Despite being 360.5 km (224.0 mi) long, it rises only 76 m (249 ft) above sea level , so
2596-452: The name Polltullyard, after the local townland, was adopted. The Pollahune entrance to Shannon was always dangerous, often dumping rocks on passing cavers and finally in 1995 it collapsed, making the cave inaccessible. During subsequent years attention was turned to Polltullyard, the downstream end of which lay within 60 metres (200 ft) of upstream JCP Passage, according to the surveys . Various groups of cavers attempted to dig through
2655-623: The northeastern, eastern, and southern shores of King's Island , Limerick before rejoining the Shannon at Hellsgate Island . The Shannon Callows , areas of lowland along the river, are classified as a Special Area of Conservation . Settlements along the river (going upriver) include Kilrush , Tarbert , Glin , Foynes , Askeaton , Shannon Town , Limerick , Castletroy , Castleconnell , O'Briensbridge , Montpelier , Killaloe , Ballina , Portumna , Banagher , Athlone , Lanesborough , Carrick-on-Shannon , Leitrim village and Dowra . The river began flowing along its present course after
2714-481: The point where the river water meets the sea water of the estuary . The Shannon is tidal east of Limerick as far as the base of the Ardnacrusha dam . The Shannon divides the west of Ireland (principally the province of Connacht ) from the east and south ( Leinster and most of Munster ; County Clare , being west of the Shannon but part of the province of Munster, is the major exception.) The river represents
2773-408: The river from Battlebridge to Lough Allen , which was opened in 1820. In the latter part of the 1820s, trade increased dramatically with the arrival of paddle-wheeled steamers on the river which carried passengers and goods. By 1831 14,600 passengers and 36,000 long tons (37,000 tonnes) of freight were being carried. This put new pressure on the navigation and a commission was set up resulting in
2832-472: The river is easily navigable, with only a few locks along its length. There is a hydroelectric generation plant at Ardnacrusha belonging to the ESB . Shipping in the Shannon estuary was developed extensively during the 1980s, with over IR£ 2 billion (€2.5 billion) investment. A tanker terminal at Foynes and an oil jetty at Shannon Airport were built. In 1982 a large-scale alumina extraction plant
2891-665: The river sections and there were still shoals in the summer months, as well as a lack of harbour facilities at Limerick, and boats were limited to 15–20 long tons (15–20 tonnes) load, often less. With the approaching opening of the Grand Canal , the Grand Canal Company obtained permission from the Directors General of Inland Navigation, and asked John Brownrigg to do a survey which found that much of Omer's work had deteriorated badly, so they started repairs. After protracted negotiations on costs and conditions,
2950-465: The streamway comprises c. 450 m of fine canyon passage. ... [It] is perhaps one of the grandest sections of canyon passage in Ireland but on a striking scale. The passage is about 1–2 metres wide and ranges from 8 to 14 metres in height. There is also evidence of old high-level passage with a few rift/high level passage leads." Methodical exploration of high-level leads in St. Patrick's Extension in 2009 led to
3009-415: The sump, now named "Young, Free and Desperate". After 40 metres (130 ft) the divers emerged at the far side of the choke and made a voice connection with the dry cavers on the other side. After exploring downstream for one kilometre they returned to help dig from the other side of the choke. A connection was made a week later, after a further dive. 1,300 metres (4,300 ft) of cave was surveyed beyond
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#17327723004823068-545: The terminal boulder choke, but none were successful in stabilising the passage. In 2004 cavers from the Shannon Group began in earnest to attempt to re-enter the system, and initiated a new dig in the direction of Shannon Cave. By 2005 Shannon Cave had been re-entered via a very tight section of passage named the "Rebirth Canal". The cavers had regained JCP Passage, and access to the rest of the cave as far as George's Choke, which had collapsed again as reported by cavers on
3127-543: The work the commissioners carried out failed to solve the problems of flooding and there were disastrous floods in the early 1860s. Given the flat nature of most of the riverbank, this was not easily addressed and nothing much was done till the twentieth century. One of the first projects of the Irish Free State in the 1920s was the Shannon hydroelectric scheme which established the Ardnacrusha power station on
3186-472: The work was completed by 1810, so that boats drawing 1.75 m (5 ft 9 in) could pass from Athlone to Killaloe . Improvements on the lower levels were also undertaken, being completed by 1814. When the Royal Canal was completed in 1817 there was pressure to improve the navigation above Lough Ree. The Jamestown Canal was repaired, harbours built and John Killaly designed a canal alongside
3245-461: Was built at Aughinish . 60,000-tonne cargo vessels now carry raw bauxite from West African mines to the plant, where it is refined to alumina. This is then exported to Canada where it is further refined to aluminium. 1985 saw the opening of a 915 MW coal-fired electricity plant at Moneypoint , fed by regular visits by 150,000-tonne bulk carriers. A trap and transport scheme is in force on the Shannon as part of an eel management programme following
3304-603: Was followed at the base of the pitch to a sump. Although it has not been traced, it is likely that this stream joins the main Shannon Cave watercourse further downstream of the Snake Escape. Upstream, beyond the pitches, a further 150 metres (490 ft) of active stream passage was followed upstream to a sump. The total surveyed length of all branches in the extension came to 635 metres (2,083 ft). A 12 minute VR documentary starring Pam and Tim Fogg based on
3363-649: Was named "The Mayfly Extension". While discoveries were being made in Shannon Cave in 1980, attention was also being paid to a large doline less than a kilometre away in County Fermanagh. Members of the Reyfad Group (including the aforementioned Rev. Pitt) and the Irish Caving Club worked together to dig their way into passage leading to a 30-metre (98 ft) underground shaft, with boulder chokes and crawls at its base. They named this cave Co-operation Pot in honour of their collaboration, but later
3422-402: Was obstructed, by installing lateral canals and either pound locks or flash locks . He then continued north of Lough Ree and made several similar improvements, most notably by creating the first Jamestown Canal which cut out a loop of the river between Jamestown and Drumsna , as well as lateral canals at Roosky and Lanesborough . The lower Shannon between Killaloe and Limerick had
3481-477: Was started but the company needed more funds to complete it. In 1791, William Chapman was brought in to advise and discovered a sorry state of affairs – all the locks had been built to different dimensions and he spent the next three years supervising the rebuilding of most of them. The navigation was finally opened in 1799, when over 1,000 long tons (1,000 tonnes) of corn came down to Limerick, as well as slates and turf . But even then, there were no tow paths in
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