User:Titus Gold/sandbox
| Image | Birth name
also known as |
Kingdom of origin | Title and notes | Years evidenced | Death date and cause |
|---|---|---|---|---|---|
| Before this period only the title King of Wales or King of the Britons was used | |||||
|
Gruffudd ap Cynan | Gwynedd | Prince...of all the Welsh[1] | 1136[1] | Died 1137 at 81-82 years old. |
.jpg)
|
Owain ap Gruffudd
Owain Gwynedd |
Gwynedd | Prince of Wales[2]
Prince of the Welsh (first to use this style to indicate independence, sovereignty and supremacy over other native rulers)[3][4][5] |
~1165[4][5] | Died 1170 at 69-70 years old. |
|
Rhys ap Gruffydd
Yr Arglwydd Rhys (The Lord Rhys) |
Deheubarth | Prince of Wales[6] | 1165[7] | Died 1197, at 65 years old. |
|
Llywelyn ap Iorwerth
Llywelyn Fawr (Llywelyn the Great) |
Gwynedd | Prince of Wales[8]
Referred to by Welsh and English chroniclers as "Prince of Wales". Held a "principality" of Wales but used title "Prince of Aberffraw and lord of Snowdon", with Aberffraw suggesting supremacy over all Wales and homage from all other Kings[9] |
1240[1] | Died 1240 at 66-67 years old. |
|
Dafydd ap Llywelyn | Gwynedd | Prince of Wales[2][10] | 1245[10] | Died suddenly in 1246, at 33 years old. |
|
Llywelyn ap Gruffudd
Llywelyn ein Llyw Olaf (Llywelyn the Last) |
Gwynedd | Prince of Wales[2][11] | 1255[1] 1258, 1262, 1267[12] | Killed by English soldiers under guise of peace talks on 11 December 1282 at 59 years old.[13] |
| Dafydd ap Gruffydd | Gwynedd | Prince of Wales[2] | 1282[2][14], 1283[15] | Hung drawn and quartered on 3 October 1283 after capture by English soldiers. | |
| English rule begins following killing of Llywelyn & Dafydd ap Gruffydd | |||||
|
Madog ap Llywelyn | Gwynedd | Prince of Wales[2] | 1294[2][16] | Kept as a prisoner in London. |
|
Owain ap Tomas
Owain Lawgoch (Owain Redhand) |
Gwynedd | Prince of Wales[17] | 1363[17] | Assassinated July 1378[17] |
|
Owain ap Gruffydd
Owain Glyndŵr |
Powys, Deheubarth, Gwynedd | Prince of Wales[2] | 1400[2] | Died 1415, at 55-56 years age and buried in secret. |
| Image | Name | Kingdom of origin | Secondary source | Title period evidenced | Cause of death | Historical source |
|---|---|---|---|---|---|---|
| Before this period only the title King of Wales or King of the Britons was used | ||||||
|
|
Gruffudd ap Cynan | Gwynedd | Prince...of all the Welsh[citation needed] | 1137 | Died 1137, at 81-82 years old. | Brut y Tywysogion:
"king and sovereign and prince and defender and pacifier of all the Welsh" in 1136[1] King of all the Welsh, King of all Wales in 1137[citation needed] |
|
|
Owain Gwynedd | Gwynedd | Prince of Wales[2] | 1146–1170 | Died 1170 at 69-70 years old. | Brut y Tywysogion; modern charts:
Prince over the British country (1146); King of Wales, King of the Welsh, Prince of the Welsh[18] |
| Prince of Wales | ||||||
|
|
Rhys ap Gruffydd | Deheubarth | Prince of Wales[6] | 1184–1197 | Died 1197, at 65 years old. | Brut y Tywysogion; modern charts
"head and shield and strength of the South and of all Wales" (1197)[1] Prince of the Welsh (1184)[citation needed] |
|
|
Llywelyn ap Iorwerth | Gwynedd | Prince of Wales[8] | 1228–1240 | Died 1240 at 66-67 years old. | Brut y Tywysogion; modern charts:
Prince of Wales (1240)[1] Prince of the Welsh (1228)[citation needed] |
|
|
Dafydd ap Llywelyn | Gwynedd | Prince of Wales in 1244[2][10] | 1220–1246 | Died suddenly in 1246, at 33 years old. | Agreement with England[citation needed] |
|
|
Llywelyn ap Gruffudd | Gwynedd | Prince of Wales[2] | 1258–1282 | Killed 11 December 1282 at 59 years old.
Killed by English soldiers under the guise of peace talks. His head was paraded and placed on a spike at the Tower of London.[13] |
Brut y Tywysogion; Agreement with Scotland, agreement with England, charters etc.
(1255, 1264,1267)[1] (1258, 1258–82)[citation needed] |
| Dafydd ap Gruffydd | Gwynedd | Prince of Wales in 1282[2] | 1282–1283 | Killed 3 October 1283.
Hugh, drawn and quartered after capture by English soldiers. His head placed next to Llywelyn's. |
Letters[14][citation needed] | |
| English rule begins following killing of Llywelyn & Dafydd ap Gruffydd | ||||||
|
|
Madog ap Llywelyn | Gwynedd | Prince of Wales in 1294[2] | 1294–1295 | Kept as a prisoner in London. | Penmachno Document[citation needed] |
|
|
Owain Lawgoch | Gwynedd | Prince of Wales[17] | Proclaimed | Assassinated. | [citation needed] |
|
|
Owain Glyndŵr | Powys, Deheubarth,Gwynedd | Prince of Wales[2] | 1400 – 1415 | 1415, at 55-56 years age. Buried in secret. | Pennal Letter[citation needed] |
Water in Wales[edit]
The Welsh Government is responsible the strategic policy for water in Wales. This includes water companies entirely or mostly in Wales which are Dŵr Cymru and Hafren Dyfrdwy, Ofwat, Natural Resources Wales, the Drinking Water Inspectorate and local authorities.[19]
Natural Resources Wales is the body responsible for regulating and managing water resources in Wales.[20]
Establishment of Natural Resources Wales[edit]
On 01 April 2013, Natural Resources Wales took over the responsibilities of the Countryside Council for Wales, Environment Agency Wales and the Forestry Commission Wales.[21][22] Since 2013, Natural Resources Wales states that it has established a standalone capability and has developed its own systems that are appropriate for Wales.[23]
State of Water (2022)[edit]
- All designated bathing waters in Wales except one met the Bathing Waters Directive standards in 2016
- 63% of freshwater water bodies did not reach the good or better overall status in 2015 (defined by the Water Framework Directive)
- Pollutants from metal mines have an impact on 700 kilometres of rivers in Wales with nine of the ten worst polluted catchments in the UK[23]
Water industry ownership[edit]
The Welsh government has decided not to pursue deregulation of the water industry, except for large industrial users that consume over 50 million litres of water annually.[24]
| Year | £ million | £ per head | Index of £ per head (UK=100) |
|---|---|---|---|
| 1992 | 22,659 | 7,874 | 83 |
| 1993 | 23,697 | 8,218 | 83 |
| 1994 | 25,049 | 8,675 | 83 |
| 1995 | 26,388 | 9,135 | 84 |
| 1996 | 27,518 | 9,517 | 82 |
| 1997 | 28,672 | 9,904 | 80 |
| 1998 | 29,787 | 10,273 | 79 |
| 1999 | 30,736 | 10,596 | 77 |
| 2000 | 31,898 | 10,973 | 77 |
| 2001 | 33,525 | 11,520 | 77 |
| 2002 | 35,252 | 12,074 | 77 |
| 2003 | 37,262 | 12,712 | 76 |
| 2004 | 39,340 | 13,352 | 76 |
| 2005 | 40,711 | 13,784 | 76 |
| 2006 | 42,697 | 14,396 | 75 |
| 2007 | 44,263 | 14,853 | 74 |
| 2008 | 45,610 | 15,237 | 74 |
| 2018 | 65,089 | 20,815 | 70 |
Penal Laws content save
Penal laws applied to the Welsh[edit]
In early 1401, multiple anti-Welsh statutes and ordinances were passed with more being added in 1402. These later become known as the Penal Laws.[26]
The penal laws applied to the Welsh in 1402 were:[27]
- Englishman shall not be convict[ed] by Welshman in Wales (this included Welsh through marriage);
- Against wasters minstrels etc. in Wales ("Item, to eschew many diseases and mischiefs, which have happened before this time in the land of Wales…: it is ordained and stablished that no waster, rhymer, minstrel nor vagabond be in any wise sustained in the land of Wales…")
- Against congregations in Wales (public meetings were banned)
- Welshmen shall not be armed ("no Welshman be armed nor bear defensible armour")
- No victual or armour shall be carried into Wales (it was banned for an Englishman to carry armour to Wales or a Welshman to possess such items of battle)
- Welshmen shall not have castles etc (only the castles from the time of Edward I were allowed to be used)
- No Welshman shall bear office ("Justice, Chamberlain, Chancellor, Treasurer, Sheriff, Steward, Constable of Castle, Receiver, Escheator, Coroner, nor Chief Forester nor any other Officer, nor Keeper of the Records, nor Lieutenant in any of the said Offices in no part of Wales, nor of the Council of any English lord…")[27]
In 1431, 1433 and 1471 the English Parliament insisted upon re-asserting the Penal Laws.[28]
Effects[edit]
| History of Wales |
|---|
.svg){kind=small}  |
Discrimination and psychological effect[edit]
Welsh historian, RR Davies said English and Welsh people "were now formally and legally separated from one another, to the disadvantage of the Welsh, in a way which had not been so before, at least legislatively and on a country-wide basis."[29]: 281 Davies adds that the laws were possibly more effective as psychological propaganda, rather than in practical application.[26] Welsh historian Martin Johnes also says that the laws were rarely implemented, but symbolised how there was no ethnic equality between the English and the Welsh.[30]
The laws weighed heavily on the Welsh[31] and restricted them from living a complete life.[32] This caused significant ill-feeling among the Welsh people and restricted nobles in Wales from improving their standing, unable to get a job in their local municipality.[33] Historian Glanmor Williams says that the laws were a reminder to the Welsh of their inferiority and insecurity despite multiple exemptions. The laws stayed on the statute book and were resented by the Welsh people.[34] Adam of Usk says that the laws were "harsh" English decrees against Anglo-Welsh marriage.[35]
Welshmen find ways around laws[edit]
Some Welshmen had the English parliament declare themselves English so that they were able to achieve higher office. Despite this, in everyday life, people were able to overcome racial hierarchy in trade and marriage. In the century following the laws, the Welsh Marches were lawless to a degree which allowed Welsh gentry to hold junior positions of responsibility across Wales, despite the penal laws. Although their lands grew, their second class identity however, remained. Some English nobles intermarried with Welsh women and internalised a Welsh identity, suggesting Wales had a complex colonial identity. There was a growing sense of a denial of social opportunity for the Welsh and governance remained unorganised.[30]
According to Welsh barrister Thomas Glyn Watkin, despite the periodic reimposing of the laws, some Welshmen served the English crown with grants opening a path to wealth and social standing in Wales and at court and English king, Henry VII gave relief to those loyal to him via denizenship (gaining some rights including to hold land), but did not end the Penal laws.[36]
Rebellion[edit]
Phil Carradice says that the laws of English domination encouraged more men to join in the Welsh Revolt, led by Owain Glyndŵr.[37] This view is also suggested by author Jon Gower, who says that the Penal Laws of 1401-1402 banned the Welsh people from gaining land or property across the border, or from making fortifications to their own houses, or bearing arms or congregating in mass numbers or encouraging bards. He says that these laws only encouraged the Welsh to revolt.[38] The laws encouraged more Welsh citizens to support Glyndŵr's revolt with Welsh labourers, students and nobles leaving England to support the cause.[39] According to historian Geraint Jenkins, the racist penal code of 1401-2 applied subordinate, second-class citizen status to the Welsh and there were no new rebellions against the English crown. A deep sense of anger remained, but hope of a united independent Wales led by a native Welsh prince had faded away. Jenkins says that English administrators reminded the Welsh of the price to pay for rebellion against the Crown.[40]
Modern interpretations[edit]
Author, Gareth Elwyn Jones says that the Penal laws sought an apartheid system with historian Martin Johnes also using the term for the system which the Penal Laws brought about.[41][30]
Politician, Adam Price has also described the punitive laws as introducing a system of racial discrimination equal to apartheid, and suggests that the memory of the race laws have been affected by a collective amnesia.[42]
Lifting of laws[edit]
Welsh people negotiated for and purchased charters from 1504-1507 to lift some dues, Bondmen were enfranchised and tenure of land was allowed via fee simple or fee tail. There remained doubt about their legal validity.[43]
Many were relieved by the Laws in Wales Acts 1535 and 1542 which was perceived to end the discriminatory system.[30] However, it was not until 1621, when Welsh MP James Perrot of Pembrokeshire moved a Bill which sought to more systematically remove obsolete acts from the statute books. These included 14 penal laws against the Welsh people by Henry IV of England.[44] Although this had been promised to the Welsh in 1536, laws were not expunged from the statue books until 1624.[44][45]
This is an overview of Water bodies and their regulation in Wales.
Responsibility[edit]
Water quality, water resources and river management are the responsibility of Natural Resources Wales. Issues relating to the water industry in general are devolved to the Senedd. This is however subject to the reservations in Schedule 7A to the Government of Wales Act 2006 (GoWA 2006).[46] Natural Resources Wales is responsible for managing water resources in Wales and is the regulatory body for this purpose.[47] On 01 April 2013, Natural Resources Wales took over the responsibilities of the Countryside Council for Wales, Environment Agency Wales and the Forestry Commission Wales.[48][49] Since 2013, Natural Resources Wales states that it has established a standalone capability and has developed its own systems that are appropriate for Wales.[50]
State of Water[edit]
- All designated bathing waters in Wales except one met the Bathing Waters Directive standards in 2016
- 63% of freshwater water bodies in Wales did not meet the overall status of good or better in 2015 (defined by the Water Framework Directive)
- Pollutants from metal mines have impacted 700 kilometres of rivers in Wales with nine out of the ten worst polluted catchments in the UK affected[50]
Water industry ownership[edit]
The Welsh government has decided not to pursue deregulation of the water industry, except for large industrial users that consume over 50 million litres of water annually.[51]
Water bodies[edit]
Current Welsh performance[edit]
Olympics[edit]
In terms of medals won per population head, an alternative table includes countries that have won a minimum of one gold medal, Welsh athletes come second in the world (behind New Zealand only) based on medals per capita.[52] Welsh athletes won more medals per head than any other country or region in the UK, at the 2016 Rio Summer Olympics.[53]
Team Wales at the Commonwealth Games[edit]
Sport has been described as Wales' most significant platform, internationally. Wales competes separately, alongside other Home Nations, at the Commonwealth Games, with such representation said to give visibility to Wales internationally.[54] Professor Stead stated in reference to the 1958 Commonwealth Games, "It was only as a result of the success of the Wales team in these Games, that the government was finally forced to officially recognise the Red Dragon as the flag of Wales."[55] Stead stated that the games "give Wales a sense of confidence in our own identity, starting a process which led to the establishment of the National Assembly, and which is still ongoing today".[54][55] The Commonwealth Games are one of the competitions where Wales can compete on an international level.[56]
At the 2014 Commonwealth Games in Glasgow, Scotland, the Welsh delegation achieved its most successful medal count in any Commonwealth Games up to that point. Winning 36 medals, including five gold, eleven silver and 20 bronze.[57] In 2022, Wales finished eighth with 28 medals.[58]
Opposition to Great Britain sport teams[edit]
There has been opposition to a 'Team GB' delegation in specific Olympic sports, such as football[59] and rugby sevens[60] and there is very little active support in Wales for a UK football team.[61]
The FAW and some fans criticised a Great Britain Olympic football team for the 2012 Olympics over fears it would impact Wales' status and identity as an individual nation in international football.[60] Gareth Bale attracted criticism from the FAW and some fans when wearing a GB shirt, whereas Aaron Ramsey declared he would not be part of any such Olympic GB football team. [62] Rugby sevens winger Lloyd Lewis stated a GB Rugby Sevens team would impact Welsh players' opportunities with more competition.[63] The GB team competed previously in 2021 due to funding cuts, with the decision for a GB team at the 2023 World Sevens Series agreed by the Welsh Rugby Union.[64]
Other sources[edit]
Scottish sports commentator for ESPN, Derek Rae has advocated for the countries of the UK to have their own national Olympic football teams, saying "In our sport, ENG, SCO, NI & Wales are separate entities."[65]
"Y Chwyldro" ("The revolution") has also supported an independent Wales with its own Olympic Team.[66]
Paula Radcliffe has supported Scotland, Wales, England and Northern Ireland having their own national teams for international competitions.[67]
The political party Gwlad[68] and Welsh Football Fans for Independence have supported the proposals for a Welsh Olympic team.[69]
A Senedd petition for a Wales national Olympic team by 2012 was created by Dr Geraint Tudur, previously of Bangor and at the time, the general secretary of the Union. Tudur stated, "We call upon the National Assembly for Wales to ensure that a team from Wales competes in the 2012 Olympic Games and every subsequent game thereafter.” The petition received 50 signatures by 21 August 2008. [70]
Welsh independence supporters that need better citations[edit]
- Kevin Allen (director) - Former actor, now director.[71]
- Matthew Rhys - Welsh actor.[72]
- Gruff Rhys - Welsh musician and Super Furry Animals lead singer.[73]
- Beti George - Welsh broadcaster.[74]
- Llŷr Ifans - Welsh actor best known for Twin Town.[75]
- Gwenno Saunders - Welsh singer and musician.[76]
- Cian Ciaran - Welsh musician, producer and Super Furry Animals member.[77]
- Richard Mylan - Welsh actor.[78]
- Catrin Dafydd - Welsh author, scriptwriter and poet.[79]
- Dewi "Pws" Morris - Edward H. Dafis singer and Grand Slam (1978 film) actor.[80]
- Dr John Ball - Economist.[81]
Princess of Wales[edit]
Princess of Wales (Welsh: Tywysoges Cymru) was a title held by the spouse of the native Prince of Wales before its current use as the title of the spouse of the heir apparent to the British throne, and Prince of Wales.
The last native Princess of Wales was Eleanor de Montfort, following the killing of Llywelyn ap Gruffydd by English soldiers.[82] The first English Prince of Wales was then appointed heir apparent of the English crown was appointed after Llywelyn ap Gruffydd was killed.[83] The title has also been retroactively used for the spouse of native Prince of Wales Owain Glyndwr, who later led the Welsh Revolt against English rule in Wales.[84][85] The current title-holder is Catherine, wife of William, Prince of Wales, heir apparent of the British monarchy.[82]
Dams in Wales[86][edit]
| Number | Reservoir Name | Reservoir Status | Location | Local authority | Manager name | Reservoir category | Year built | Maximum dam height (m) | Raised capacity (m3) | Top water level (maod) | Surface area (m2) | Top of dam (maod) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | Cae Llwyd | Under Construction (S6 Supervision) | Near Wrexham | Wrexham County Borough Council | Hafren Dyfrdwy Cyfyngedig | Impounding | 1878 | 15 | 177000 | 278.46 | 40300 | 279.42 |
| 2 | Llwyn Onn 1 | Under Construction (S6 Supervision) | Abenbury, Wrexham | Wrexham County Borough Council | Hafren Dyfrdwy Cyfyngedig | Non Impounding | 2017 | 6.5 | 12074 | 76.1 | 2236 | 76.4 |
| 3 | Pengarnddu | Under Construction (S6 Supervision) | Pengarnddu, Merthyr Tydfil | Merthyr Tydfil County Borough Council | Dwr Cymru Cyfyngedig | Non Impounding | 2021 | 5.74 | 11451 | 408.62 | 1498 | 409.62 |
| 4 | Pontarddulais Flood Storage Area | Under Construction (S6 Supervision) | Pontardulais | City and County of Swansea | Natural Resources Wales (FRM) | Impounding | 2014 | 9.3 | 170250 | 111.2 | 59100 | |
| 5 | Pen-y-Gwely | Under Construction (S6 Supervision) | Near Oswestry | Powys County Council | Hafren Dyfrdwy Cyfyngedig | Impounding | 1894 | 18 | 114000 | 332.18 | 18700 | 333.74 |
| 6 | Llwyn Onn 2 | Under Construction (S6 Supervision) | Wrexham | Wrexham County Borough Council | Hafren Dyfrdwy Cyfyngedig | Non Impounding | 2018 | 7.5 | 12245 | 76.1 | 2268 | 76.4 |
| 7 | Llyn Mawr | Under Construction (S6 Supervision) | Llanarthne, Carmarthen | Carmarthenshire County Council | National Botanic Garden of Wales | Impounding | Main dam: Earthfill, Saddle dam: Earthfill | Main dam: 6, Saddle dam: | 62500 | 53.8 | 37000 | Main dam: 55.1, Saddle dam: |
| 8 | Rhyl Golf Course FSA | Under Construction (S6 Supervision) | Rhyl | Denbighshire County Council | Denbighshire County Council | Non Impounding | 2015 | Rhyl Golf Course - Sea Wall: 1.4, Rhyl Golf Course - Western Wall: 1.4, Rhyl Golf Course - Southern Embankment: 1.4 | 145000 | 6 | 150000 | Rhyl Golf Course - Sea Wall: 6.3, Rhyl Golf Course - Western Wall: 6, Rhyl Golf Course - Southern Embankment: |
| 9 | Dolwen | Under Construction (S6 Supervision) | Llanefydd, nr Abergele | Conwy County Borough Council | Dwr Cymru Cyfyngedig | Impounding | 1905 | 14.9 | 221000 | 167.84 | 63000 | 170.84 |
| 10 | Pendinas | Under Construction (S6 Supervision) | Near Minera | Denbighshire County Council | Hafren Dyfrdwy Cyfyngedig | Impounding | 1898 | Dam 4: 10, Dam 1: 4, Dam 2: 4, Dam 3: 4 | 282000 | 391.63 | 78000 | Dam 4: 391.992, Dam 1: 392.249, Dam 2: 392.172, Dam 3: 392.06 |
| 11 | Ty'n y Caeau | Under Construction (S6 Supervision) | Menai Bridge, Anglesey | Isle of Anglesey County Council | Isle of Anglesey County Council | Impounding | 1923 | 4.5 | 12500 | 4300 | ||
| 12 | Afon Dafen Crossing | In Operation | Near Llanelli | Carmarthenshire County Council | Carmarthenshire County Council | Impounding | 1993 | 5.5 | 65000 | 39000 | ||
| 13 | Celyn | In Operation | Near Bala | Gwynedd Council | Dwr Cymru Cyfyngedig | Impounding | 1966 | 44.8 | 80930850 | 296.18 | 3300000 | 299.77 |
| 14 | Ref 5 | In Operation | Amlwch | Anglesey County Council | Parys Mountain Mines Ltd | Impounding | Not Known | 1.75 | 11534 | 6591 | ||
| 15 | Llyn Ffrith Carreg-y-Bwch | In Operation | Pont y Pant | Gwynedd Council | Individual(s) | Impounding | 1850 | SW (Main) Dam: 8.756, SE (Saddle) Dam: 8.756 | 17112 | 225.425 | 11707 | SW (Main) Dam: 227.3, SE (Saddle) Dam: 226.6 |
| 16 | Cefnllan | In Operation | Aberystwyth | Ceredigion County Council | Dwr Cymru Cyfyngedig | Non Impounding | 1964 | 5 | 10414 | 86 | 3880 | 88 |
| 17 | Sluvad No.3 | In Operation | Pontypool | Torfaen County Borough Council | Dwr Cymru Cyfyngedig | Non Impounding | Not Known | 5.2 | 22700 | 142 | 3725 | 144 |
| 18 | Llyn Du-bach | In Operation | Blaenau Ffestiniog | Gwynedd Council | Individual(s) | Welsh Slate Ltd | Impounding | Not Known | 3.442 | 32347 | 448 | 17729 | |
| 19 | Tan-y-Graig | In Operation | Llanelltyd, Dolgellau | Gwynedd Council | Natural Resources Wales (WGWE) | Individual(s) | Impounding | North East Dam: Earthfill, South West Dam: Earthfill | North East Dam: 4, South West Dam: | 13000 | 130.5 | 9200 | North East Dam: 131, South West Dam: |
| 20 | Cwm Dulyn | In Operation | Near Penygroes | Gwynedd Council | Dwr Cymru Cyfyngedig | Impounding | 1901 | 2.3 | 704016 | 238.88 | 135000 | 240.65 |
| 21 | Brynmill Park Lake | In Operation | Near Swansea | City and County of Swansea | City and County of Swansea | Impounding | 1840 | 4.5 | 36800 | 12000 | ||
| 22 | Bryn Bach Park Lake | In Operation | Near Merthyr Tydfil | Blaenau Gwent County Borough Council | Blaenau Gwent County Borough Council | Impounding | 1982 | 15 | 175000 | 367.29 | 124700 | 5.35 |
| 23 | Cwmtillery Lake | In Operation | Cwmtillery | Blaenau Gwent County Borough Council | Blaenau Gwent County Borough Council | Impounding | Not Known | 2.5 | 10449 | 289.72 | 9612 | 291.5 |
| 24 | Marchlyn Bach | In Operation | Near Deinolen | Gwynedd Council | Dwr Cymru Cyfyngedig | Impounding | 1969 | 10 | 352000 | 481.99 | 51510 | 484.7 |
| 25 | Llys-y-Fran | In Operation | Near Haverfordwest | Pembrokeshire County Council | Dwr Cymru Cyfyngedig | Impounding | 1971 | 35 | 1040000 | 96.14 | 800000 | 34.15 |
| 26 | Teifi | In Operation | Near Pontrhydfendigaid | Ceredigion County Council | Dwr Cymru Cyfyngedig | Impounding | 1960 | 6 | 850000 | 253000 | ||
| 27 | Pen-y-Gwaith | In Operation | Gwydyr Forest, Llanrwst | Conwy County Borough Council | Natural Resources Wales (WGWE) | Impounding | 1875 | 2 | 11336 | 6870 | ||
| 28 | Llwynfilly | In Operation | Glasbury | Powys County Council | Individual(s) | Impounding | 1970 | 4.21 | 13848 | 145.355 | 7867 | 145.95 |
| 29 | Cwm Clydach | In Operation | Neath Abbey | Neath Port Talbot County Borough Council | OWNERLESS DAM | Neath Port Talbot County Borough Council | Glynclydach Dam Ltd | The Trustees of Victor Johnson SSAS | Impounding | 1840 | 11 | 45000 | 37.02 | 20000 | |
| 30 | Shon Sheffrey | In Operation | Near Tredegar | Blaenau Gwent County Borough Council | Dwr Cymru Cyfyngedig | Impounding | 1896 | 14 | 350000 | 365.48 | 72846 | |
| 31 | Llangeinor (282) | In Operation | Llangenior, Bridgend | Bridgend County Borough Council | Dwr Cymru Cyfyngedig | Non Impounding | 1926 | 6 | 10360 | 197 | 2420 | 199 |
| 32 | Syke Farm Reservoir | In Operation | Red Roses | Carmarthenshire County Council | Individual(s) | Impounding | 7.251 | 31541 | 8700 | 111.614 | ||
| 33 | Afon Rhyd Hir (FRM) | In Operation | Pwllheli | Gwynedd Council | Natural Resources Wales (FRM) | Impounding | 1813 | 5 | 164000 | 128287 | ||
| 34 | Machine Pond | In Operation | Brynmawr | Blaenau Gwent County Borough Council | Blaenau Gwent County Borough Council | Impounding | Not Known | 2.391 | 22187 | 22187 | ||
| 35 | Lluest Wen | In Operation | Near Maerdy | Rhondda Cynon Taff County Borough Council | Dwr Cymru Cyfyngedig | Impounding | 1972 | 21 | 1080000 | 407 | 110000 | |
| 36 | Usk | In Operation | Llandovery | Powys County Council | Dwr Cymru Cyfyngedig | Impounding | 1955 | 31 | 12253000 | 306.35 | 1160000 | 308.46 |
| 37 | Hafod-y-Llyn | In Operation | Near Rhyd, Porthmadoc | Gwynedd Council | Individual(s) | Impounding | 1870 | South Dam: 2.924, East Saddle: 1 | 50000 | 126.752 | 21000 | South Dam: 127.418, East Saddle: 126.952 |
| 38 | Firewater Reserve | In Operation | Robeston West, near Milford Haven | Pembrokeshire County Council | Puma Energy (UK) Limited | Impounding | 1995 | 4.34 | 16000 | 42.77 | 11230 | 43.47 |
| 39 | New Pond | In Operation | Margam | Neath Port Talbot County Borough Council | Neath Port Talbot County Borough Council | Impounding | 2.3 | 16381 | 54.66 | 19363 | 55.03 | |
| 40 | Barlwyd Isaf | In Operation | Near Blaenau Ffestiniog | Gwynedd Council | J W Greaves & Son Limited | Impounding | 1888 | 12.1 | 123000 | 458 | 40000 | 459.8 |
| 41 | Tan-y-Grisiau | In Operation | Near Blaenau Ffestiniog | Gwynedd Council | First Hydro Company | Impounding | 1961 | 15 | 2124000 | 400639 | ||
| 42 | Roath Park Lake | In Operation | Cardiff | Cardiff Council | Cardiff Council | Impounding | 1895 | 6.48 | 108000 | 20.12 | 120000 | 22.03 |
| 43 | Skim Ponds | In Operation | Near Milford Haven | Pembrokeshire County Council | Puma Energy (UK) Limited | Non Impounding | 1974 | 7.5 | 88500 | 65.35 | 55000 | 65.85 |
| 44 | Llyn Canol | In Operation | Llanarthne | Carmarthenshire County Council | National Botanic Garden of Wales | Impounding | 1996 | 4.9 | 13329 | 57.05 | 10810 | 58.25 |
| 45 | Peterstone Fishing Lake | In Operation | Wentlooge, nr Cardiff | Newport City Council | Individual(s) | Non Impounding | 1991 | 2 | 70000 | 40000 | ||
| 46 | Marchweil | In Operation | Near Wrexham | Wrexham County Borough Council | Hafren Dyfrdwy Cyfyngedig | Non Impounding | 1982 | 7.5 | 110000 | 84 | 22300 | 85 |
| 47 | Cefn Mably No. 2 | In Operation | Pontprennau | Cardiff Council | Dwr Cymru Cyfyngedig | Non Impounding | 1965 | |||||
| 48 | Cwm Oernant Lower | In Operation | Carmarthen | Carmarthenshire County Council | Carmarthenshire County Council | Impounding | 1890 | 4.7 | 11040 | 39.5 | 5520 | 40.5 |
| 49 | Llyn Glan-y-Gors | In Operation | Gwydyr Forest, Trefriw, Conwy | Conwy County Borough Council | Individual(s) | Impounding | 1875 | Southern Dam: 1.9, Western Dam: 1.83 | 51969 | 274.574 | 28909 | Southern Dam: 274.9, Western Dam: 275.03 |
| 50 | Vyrnwy | In Operation | Near Welshpool | Powys County Council | Hafren Dyfrdwy Cyfyngedig | Impounding | 1892 | 25.62 | 59666000 | 251.86 | 4536000 | 256.13 |
| 51 | Rhymney Bridge No.1 | In Operation | Near Rhymney | Caerphilly County Borough Council | Dwr Cymru Cyfyngedig | Impounding | 1860 | 12 | 57845 | 14000 | ||
| 52 | Ystradfellte | In Operation | Near Aberdare | Powys County Council | Dwr Cymru Cyfyngedig | Impounding | 1914 | 33 | 3200000 | 239000 | ||
| 53 | Morwynion | In Operation | Near Ffestiniog | Gwynedd Council | Dwr Cymru Cyfyngedig | Impounding | 1879 | 6.1 | 621970 | 392.3 | 113000 | 393.99 |
| 54 | Llyn Ffynnon-y-Gwas | In Operation | Near Caernarfon | Gwynedd Council | Individual(s) | Impounding | 2.69 | 79701 | 548.1 | 55445 | 550 | |
| 55 | Bicton 2 'Middle' | In Operation | St Ishmaels | Pembrokeshire County Council | Bicton Farms Ltd | Impounding | 4.86 | 27252 | 47.405 | 11399 | 47.4 | |
| 56 | Greenhill | In Operation | Hundleton, Pembroke Dock | Pembrokeshire County Council | Dwr Cymru Cyfyngedig | Non Impounding | ||||||
| 57 | Llyn Bodgynydd | In Operation | Near Llanwrst | Conwy County Borough Council | Llanrwst Anglers Club | Impounding | 1996 | 4.5 | 69000 | 79000 | ||
| 58 | Townhill | In Operation | Townhill, Swansea | City and County of Swansea | Dwr Cymru Cyfyngedig | Non Impounding | 1912 | 5.9 | 11100 | 178.98 | 3075 | 122 |
| 59 | Llandrindod Lake | In Operation | Llandrindod Wells | Powys County Council | Powys County Council | Impounding | 1890 | 3 | 63500 | 224.5 | 63500 | 225 |
| 60 | Nant-y-Ffrith | In Operation | Near Four Crosses | Denbighshire County Council | Hafren Dyfrdwy Cyfyngedig | Impounding | 1871 | 8.5 | 103000 | 317.001 | 52000 | 318.03 |
| 61 | Pant-y-Llyn | In Operation | Builth Wells | Powys County Council | Individual(s) | Impounding | NW Dam: Gravity, North Dam: Gravity | NW Dam: 2.489, North Dam: 2.11 | 33717 | 410.1 | 26464 | NW Dam: 411.1, North Dam: 411.1 |
| 62 | Carno Upper | In Operation | Near Ebbw Vale | Powys County Council | Dwr Cymru Cyfyngedig | Impounding | 1875 | 14 | 309091 | 444.588 | 63600 | 446.01 |
| 63 | St Lythans | In Operation | Twyn yr Odyn, Vale of Glamorgan | Vale of Glamorgan Council | Dwr Cymru Cyfyngedig | Non Impounding | 1945 | 4.5 | 13500 | 126 | 3415 | 128 |
| 64 | Hensol | In Operation | Near Cardiff | Vale of Glamorgan Council | J H Leeke & Sons Limited | Impounding | 1900 | 6 | 86000 | 43.84 | 92000 | 45.5 |
| 65 | Llyn y Foel | In Operation | Conwy | Conwy County Borough Council | Allied Hydro Power | Impounding | 1880 | 4 | 190000 | 535 | 38000 | 538 |
| 66 | Llyn Clywedog | In Operation | Near Llanidloes | Powys County Council | Hafren Dyfrdwy Cyfyngedig | Impounding | 1967 | Clywedog: 72, Bwlch-y-Gle: 9 | 50000000 | 282.55 | 2490000 | Clywedog: 282.55, Bwlch-y-Gle: 284.99 |
| 67 | Alaw | In Operation | Near Llanddeusant | Anglesey County Council | Dwr Cymru Cyfyngedig | Impounding | 1966 | Primary dam: 7, Secondary dam: 3, Tertiary Dam: 6.79 | 7638000 | 39.73 | 3666000 | Primary dam: 41.61, Secondary dam: , Tertiary Dam: |
| 68 | Upper Quarry Pit | In Operation | Conwy | Conwy County Borough Council | Allied Hydro Power | Impounding | 1880 | 20 | 34000 | 470 | 1700 | 480 |
| 69 | Hendrescythan | In Operation | Creigau | Rhondda Cynon Taff County Borough Council | Individual(s) | Impounding | 5.727 | 25400 | 78.81 | 14110 | 79.122 | |
| 70 | Plas Uchaf | In Operation | Near Llannefydd | Conwy County Borough Council | Dwr Cymru Cyfyngedig | Impounding | 1870 | 15 | 225500 | 144.81 | 36000 | 147.06 |
| 71 | Crickmarren | In Operation | Hundleton | Pembrokeshire County Council | Individual(s) | Impounding | 1843 | 4 | 18000 | 15000 | ||
| 72 | Mill Pond | In Operation | Pembroke | Pembrokeshire County Council | Pembrokeshire County Council | Impounding | 1820 | 5 | 55000 | 2.91 | 49900 | 5.2 |
| 73 | Gnoll Park Fish Pond | In Operation | Neath | Neath Port Talbot County Borough Council | Neath Port Talbot County Borough Council | Impounding | 1702 | 5.8 | 28446 | 61.1 | 23181 | 63.1 |
| 74 | Carno Lower | In Operation | Near Ebbw Vale | Blaenau Gwent County Borough Council | Dwr Cymru Cyfyngedig | Impounding | 1911 | 27 | 800000 | 392.7 | 88000 | 394.5 |
| 75 | Llyn Heilyn | In Operation | Llanfihangel Nant Melan | Powys County Council | Individual(s) | Impounding | Not Known | 1.67 | 12414 | 24780 | ||
| 76 | Bron Eifion Fishing Lake | In Operation | Criccieth | Gwynedd Council | Individual(s) | Impounding | Not Known | 2.766 | 19691 | 16000 | 66.12 | |
| 77 | Llandegfedd (0116) | In Operation | Pontypool | Monmouthshire County Council | Dwr Cymru Cyfyngedig | Impounding | 1963 | 36.9 | 24466000 | 85.344 | 1760445 | 87.2 |
| 78 | Cwmavon | In Operation | Near Cwmavon | Torfaen County Borough Council | Dwr Cymru Cyfyngedig | Non Impounding | 1894 | 10 | 43750 | 8200 | ||
| 79 | Grwyne Fawr | In Operation | Near Abergavenny | Powys County Council | Dwr Cymru Cyfyngedig | Impounding | 1928 | 48 | 1480450 | 545 | 105000 | 547.22 |
| 80 | Cyfty | In Operation | Betws y Coed | Gwynedd Council | Natural Resources Wales (WGWE) | Impounding | 1850 | 6 | 13600 | 10550 | ||
| 81 | Gelli Gain | In Operation | Near Bron Aber | Gwynedd Council | Dwr Cymru Cyfyngedig | Impounding | 1.6 | 24500 | 395.6 | |||
| 82 | Llwyn-On | In Operation | Near Merthyr Tydfil | Merthyr Tydfil County Borough Council | Dwr Cymru Cyfyngedig | Impounding | 1926 | 24 | 5504550 | 260.3 | 583000 | 262.13 |
| 83 | Cwmystradllyn | In Operation | Near Porthmadog | Gwynedd Council | Dwr Cymru Cyfyngedig | Impounding | 1961 | 10.7 | 2950000 | 205.27 | 400000 | 207.4 |
| 84 | Pant Glas | In Operation | Penycae, Rhosllanerchcrugog | Wrexham County Borough Council | Hafren Dyfrdwy Cyfyngedig | Impounding | 1940 | 9.65 | 18160 | 280.72 | 6588 | 281.95 |
| 85 | Cwm Oernant Upper | In Operation | Carmarthen | Carmarthenshire County Council | Carmarthenshire County Council | Impounding | 1890 | 8.3 | 10480 | 46.8 | 5240 | 47.9 |
| 86 | West Reservoir Pembroke Refinery | In Operation | Near Pembroke | Pembrokeshire County Council | Valero Energy Limited | Impounding | 1964 | 8.24 | 58000 | 14970 | ||
| 87 | Van Pool | In Operation | Y Fan, Llanidloes | Powys County Council | Individual(s) | Impounding | 1865 | 2 | 24333 | 34426 | ||
| 88 | Cefn Golau Pond | In Operation | Tredegar | Blaenau Gwent County Borough Council | WBCP (Bedwellty) Ltd. | Impounding | 1939 | 1.4 | 15889 | 377.8 | 14225 | |
| 89 | Ynys-y-Fro Lower | In Operation | Near Newport | Newport City Council | Dwr Cymru Cyfyngedig | Impounding | 1848 | 15 | 294000 | 37.48 | 60705 | 39.64 |
| 90 | Castle Pond | In Operation | Pembroke | Pembrokeshire County Council | Pembrokeshire County Council | Impounding | 1972 | 6 | 48000 | 40000 | ||
| 91 | Llyn Cae Conroy Isaf | In Operation | Pennant, Llanbrynmair | Powys County Council | Individual(s) | Impounding | 1830 | 7.6 | 22160 | 201.5 | 7812 | 204.6 |
| 92 | Coed Dolwyd | In Operation | Llandudno Junction | Conwy County Borough Council | Dwr Cymru Cyfyngedig | Non Impounding | 2013 | 5.2 | 21960 | 129.2 | 5670 | 129.2 |
| 93 | Crai | In Operation | Near Brecon | Powys County Council | Dwr Cymru Cyfyngedig | Impounding | 1907 | 30.5 | 4580000 | 11000 | ||
| 94 | Garreg Ddu | In Operation | Near Rhayader | Powys County Council | Dwr Cymru Cyfyngedig | Impounding | 1904 | 17 | 3018000 | 200000 | 238.35 | |
| 95 | Llyn Ffridd y Bwlch | In Operation | Blaenau Ffestiniog | Gwynedd Council | Cymdeithas Enweiriol y Cambrian | Impounding | Not Known | 5 | 16500 | 11660 | 317.18 | |
| 96 | Llyn Plas-y-Mynydd | In Operation | Near Machynlleth | Ceredigion County Council | Individual(s) | Impounding | 1850 | 5 | 90000 | 75000 | ||
| 97 | Nant-y-Fendrod | In Operation | Near Swansea | City and County of Swansea | City and County of Swansea | Impounding | 1985 | 5.49 | 142000 | 77000 | ||
| 98 | Brithdir Mawr | In Operation | Near Mold | Flintshire County Council | Dwr Cymru Cyfyngedig | Impounding | 1897 | 10 | 36370 | 254.74 | 7082 | 256 |
| 99 | Glascoed | In Operation | Bodelwyddan, Rhyl | Denbighshire County Council | Dwr Cymru Cyfyngedig | Non Impounding | 1971 | 6.4 | 18400 | 120 | 3000 | 122 |
| 100 | Llyn Nant-y-Cagal | In Operation | Near Machynlleth | Ceredigion County Council | Individual(s) | Impounding | 8 | 60000 | 394 | 38000 | ||
| 101 | Pen-y-Garreg | In Operation | Near Rhayader | Powys County Council | Dwr Cymru Cyfyngedig | Impounding | 1904 | 35.5 | 6046000 | 288 | 500000 | 289.7 |
| 102 | Pant Farm Lake | In Operation | Llanddewi Brefi | Ceredigion County Council | DG Jones (Properties) Ltd | Impounding | 1968 | 2 | 23000 | 45400 | ||
| 103 | Gyrn Castle Fish Pond | In Operation | Llanasa, Nr Prestatyn | Denbighshire County Council | Individual(s) | Impounding | 5.529 | 26814 | 108.897 | 10353 | ||
| 104 | Dyffryn Conwy FSR (FRM) | In Operation | Trefriw | Conwy County Borough Council | Natural Resources Wales (FRM) | Impounding | 2009 | 5.68 | 1130000 | 5.65 | 970000 | 7.8 |
| 105 | Almere Flood Storage Area | In Operation | Rossett, Wrexham | Flintshire County Council | Natural Resources Wales (FRM) | Impounding | 2006 | 4 | 25000 | 25000 | 9 | |
| 106 | Pond Feeder | In Operation | Fochrhiw | Caerphilly County Borough Council | Caerphilly County Borough Council | Impounding | Not Known | 5.781 | 22730 | 386.345 | 16100 | |
| 107 | Bro Tywi | In Operation | Croesyceiliog | Carmarthenshire County Council | Individual(s) | Impounding | 1989 | 3.5 | 21000 | 36.4 | 14000 | 37.4 |
| 108 | Cwmwernderi | In Operation | Near Port Talbot | Neath Port Talbot County Borough Council | Dwr Cymru Cyfyngedig | Impounding | 1901 | 23 | 159000 | 148.87 | 28329 | 152.87 |
| 109 | Eglwys Nunydd | In Operation | Near Margam | Neath Port Talbot County Borough Council | Tata Steel Europe Limited | Non Impounding | 1962 | 5.2 | 3840000 | 1052220 | ||
| 110 | Burton Tower Pond | In Operation | Wrexham | Wrexham County Borough Council | Individual(s) | Impounding | 1870 | 3.2 | 24996 | 50.51 | 15795 | |
| 111 | Llyn Syfydrin | In Operation | Near Ponterwyd | Ceredigion County Council | Aberystwyth Angling Association Ltd | Impounding | 1800 | 6 | 115000 | 325 | 106000 | |
| 112 | Cantref | In Operation | Near Merthyr Tydfil | Powys County Council | Dwr Cymru Cyfyngedig | Impounding | 1892 | 26 | 1490910 | 327.05 | 174000 | 329.18 |
| 113 | Cefni | In Operation | Near Llangefni | Anglesey County Council | Dwr Cymru Cyfyngedig | Impounding | 1950 | 7.9 | 1548000 | 29.87 | 690000 | 31.49 |
| 114 | Cilcain No.4 | In Operation | Near Cilcain | Flintshire County Council | Dwr Cymru Cyfyngedig | Impounding | 1908 | 11.9 | 98000 | 281.93 | 24000 | 283.3 |
| 115 | Dolwyddelan | In Operation | Dolwyddelan | Conwy County Borough Council | Dwr Cymru Cyfyngedig | Impounding | 1914 | 3.04 | 22730 | |||
| 116 | Catsash No.1 | In Operation | Langstone, Newport | Newport City Council | Dwr Cymru Cyfyngedig | Non Impounding | 1970 | 5.67 | 13600 | 121.2 | 2500 | 122.43 |
| 117 | Pontsticill | In Operation | Near Merthyr Tydfil | Merthyr Tydfil County Borough Council | Dwr Cymru Cyfyngedig | Impounding | 1927 | 34 | 15640000 | 1412000 | ||
| 118 | Cwm Hedd | In Operation | Newport | Newport City Council | LT Williams & Sons | Impounding | Not Known | 4.384 | 33292.97 | 57.074 | 25314 | |
| 119 | Glan Conwy Nature Reserve | In Operation | Llandudno Junction | Conwy County Borough Council | RSPB | Non Impounding | 1991 | 3 | 220000 | 6.06 | 135000 | 8 |
| 120 | Coed Darcy South Site | In Operation | Llandarcy | Neath Port Talbot County Borough Council | St Modwen Properties PLC | Impounding | 1960 | 5 | 21120 | 18.56 | 18000 | 21.71 |
| 121 | Llyn Newydd | In Operation | Near Blaenau Ffestiniog | Gwynedd Council | J W Greaves & Son Limited | Impounding | 1860 | 7 | 105053 | 480 | 51000 | 481.05 |
| 122 | Ffynnone | In Operation | Newchapel | Pembrokeshire County Council | Calon yn Tyfu Cyfyngedig | Impounding | 1920 | 5 | 11250 | 9000 | ||
| 123 | Bicton 1 'Upper' | In Operation | St Ishmaels | Pembrokeshire County Council | Bicton Farms Ltd | Impounding | 3.585 | 17082 | 49.031 | 12914 | 49.8 | |
| 124 | Pant Pool | In Operation | Welshpool | Powys County Council | Individual(s) | Impounding | 5.401 | 41501 | 165.4 | 22801 | ||
| 125 | Ynysygwas | In Operation | Cwmafan | Neath Port Talbot County Borough Council | Forest Lodge Lane Developments Ltd | Impounding | 1877 | 15 | 26771 | 92.559 | 7047 | |
| 126 | Penbrigog | In Operation | Llys Berllan, Buckley | Wrexham County Borough Council | Dwr Cymru Cyfyngedig | Non Impounding | 1977 | 5.6 | 22720 | 157 | 4510 | 159 |
| 127 | Lisvane (0192) | In Operation | Cardiff | Cardiff Council | Dwr Cymru Cyfyngedig | Non Impounding | 1864 | 10.3 | 363636 | 44.63 | 78000 | 45.83 |
| 128 | Radyr Llanilid | In Operation | Danescourt, Cardiff | Cardiff Council | Dwr Cymru Cyfyngedig | Non Impounding | 1958 | 6.3 | 18000 | 66 | 3000 | 68 |
| 129 | Rosebush | In Operation | Near Haverfordwest | Pembrokeshire County Council | Dwr Cymru Cyfyngedig | Impounding | 1931 | 17.5 | 650000 | 221.21 | 130000 | 222.91 |
| 130 | Purge Pond B Connah's Quay | In Operation | Connah's Quay | Flintshire County Council | Uniper UK Ltd | Non Impounding | 1995 | 13013 | 1730 | |||
| 131 | Pen-y-Mynydd | In Operation | Pen y Mynydd, Anglesey | Anglesey County Council | Dwr Cymru Cyfyngedig | Non Impounding | 1970 | 6.3 | 10512 | 98.65 | 1800 | 100.65 |
| 132 | Llyn Maen Bras (008) | In Operation | Near Bala | Gwynedd Council | Rhiwlas Hydroelectric Limited | Impounding | 1870 | 4.3 | 51000 | 348.84 | 40000 | 349.1 |
| 133 | Newport Wetlands Field Block 3 | In Operation | Newport | Newport City Council | Natural Resources Wales (Land) | Impounding | 1990 | 0.739 | 26924 | 127300 | ||
| 134 | Llyn-y-Parc | In Operation | Gwydyr Forest North, Llanrwst | Conwy County Borough Council | Natural Resources Wales (WGWE) | Impounding | 1890 | 2.8 | 49445 | 202.16 | 71700 | |
| 135 | Llanishen (00026) | In Operation | Cardiff | Cardiff Council | Dwr Cymru Cyfyngedig | Non Impounding | 1886 | 11 | 1441000 | 46.015 | 240400 | 47.18 |
| 136 | Bryngwyn Pool | In Operation | Llanfyllin | Powys County Council | Individual(s) | Impounding | 1900 | 3.36 | 35323 | 124.326 | 24463 | 124.65 |
| 137 | Aston No.2 | In Operation | Old Aston Hill, Deeside | Flintshire County Council | Dwr Cymru Cyfyngedig | Non Impounding | 1990 | 3.92 | 22720 | 83.6 | 4232 | 85.42 |
| 138 | Upper Trebeddrod | In Operation | Llanelli | Carmarthenshire County Council | Carmarthenshire County Council | Impounding | 1854 | 12.5 | 29000 | 58.38 | 9400 | |
| 139 | Tredegar House Lake | In Operation | Near Newport | Newport City Council | The National Trust | Impounding | 1790 | South and West Embankment: 2.5, Eastern Embankment: 2 | 30500 | 11.13 | 40100 | South and West Embankment: 12.034, Eastern Embankment: 11.815 |
| 140 | Purge Pond A Connah's Quay | In Operation | Connah's Quay | Flintshire County Council | Uniper UK Ltd | Non Impounding | 1995 | 13013 | 1730 | |||
| 141 | Nant-y-Draenog | In Operation | Cwmfelinfach, Ynysddu | Caerphilly County Borough Council | Eurolago e Foresta Limited | Impounding | 1897 | 14 | 54552 | 10640 | ||
| 142 | Llyn Newydd Rhos Quarry | In Operation | Conwy | Conwy County Borough Council | Allied Hydro Power | Impounding | 4 | 50000 | 347 | 23900 | 348 | |
| 143 | Ffynnon Llugwy | In Operation | Near Capel Curig | Conwy County Borough Council | Dwr Cymru Cyfyngedig | Impounding | 1919 | 8 | 1754000 | 545.87 | 162000 | 551.8 |
| 144 | Llyn-y-Garnedd | In Operation | Maentwrog | Gwynedd Council | Instant Timber Limited | Impounding | Llyn y Garnedd - Eastern Dam: Not Known, Llyn y Garnedd - Southern Dam: Rockfill | Llyn y Garnedd - Eastern Dam: 2, Llyn y Garnedd - Southern Dam: 1.6 | 22000 | 220.52 | 22000 | Llyn y Garnedd - Eastern Dam: 221.406, Llyn y Garnedd - Southern Dam: 221.479 |
| 145 | Rhosgoch | In Operation | Penrhyncoch, Aberystwyth | Ceredigion County Council | Aberystwyth Angling Association Ltd | Impounding | 1850 | 2 | 22000 | 347.563 | 26000 | 345 |
| 146 | Llieidi Lower | In Operation | Near Llanelli | Carmarthenshire County Council | Dwr Cymru Cyfyngedig | Impounding | 1878 | 18 | 700000 | 135000 | ||
| 147 | Llyn Bwlch | In Operation | Cerrigydrudion | Conwy County Borough Council | Individual(s) | Impounding | 1920 | 3 | 15000 | 349 | 16000 | 350 |
| 148 | Big Pool Llanerchydol | In Operation | Welshpool | Powys County Council | Individual(s) | Impounding | 2.1 | 17999 | 137.254 | 13567 | ||
| 149 | Middle Pond | In Operation | Merthyr Tydfil | Merthyr Tydfil County Borough Council | Merthyr Tydfil County Borough Council | Impounding | 1856 | 3 | 17000 | 357.31 | 15220 | 357.82 |
| 150 | Llyn Goddionduon | In Operation | Capel Curig | Conwy County Borough Council | Natural Resources Wales (WGWE) | Impounding | 1900 | 1.5 | 60000 | 242.71 | 56699 | 243.75 |
| 151 | Fresh Water & Well Water | In Operation | Near Shotton | Flintshire County Council | Tata Steel UK Limited | Non Impounding | 1950 | 4.6 | 61600 | 8.84 | 18635 | 9.45 |
| 152 | Lliw Upper | In Operation | Near Swansea | City and County of Swansea | Dwr Cymru Cyfyngedig | Impounding | 1896 | 23 | 1318000 | 154000 | ||
| 153 | Taff Bargoed Lake | In Operation | Trelewis | Merthyr Tydfil County Borough Council | Merthyr Tydfil County Borough Council | Impounding | 2000 | 2.33 | 24771 | 145.42 | 19279 | 146.08 |
| 154 | Llyn Ieuan Dwyrain | In Operation | Ponterwyd | Ceredigion County Council | Natural Resources Wales (WGWE) | Impounding | 1850 | 3.11 | 15393.18 | 514.73 | 18621 | 515.16 |
| 155 | Coldbrook FAS | In Operation | Barry | Vale of Glamorgan Council | Vale of Glamorgan Council | Impounding | 2017 | 3 | 19812 | 33.85 | 10472 | 34 |
| 156 | Llyn Pendam | In Operation | Near Ponterwyd | Ceredigion County Council | Aberystwyth Angling Association Ltd | Impounding | 1850 | 8.5 | 70000 | 32500 | ||
| 157 | Dinas | In Operation | Near Ponterwyd | Ceredigion County Council | Statkraft Energy Limited | Impounding | 1965 | 30 | 1091061 | 254.51 | 243000 | 256.95 |
| 158 | Gwgia | In Operation | Near Newtown` | Powys County Council | The Gregynog Trust | Impounding | 1903 | 8 | 108600 | 274.87 | 64000 | 276.7 |
| 159 | Clywedog | In Operation | Near Cyffylliog | Denbighshire County Council | Vale of Clwyd Angling Club | Impounding | 1937 | 8.84 | 34600 | 411.18 | 12950 | 412.86 |
| 160 | Settling Tank Connah's Quay | In Operation | Connah's Quay | Flintshire County Council | Uniper UK Ltd | Non Impounding | 1995 | 31055 | 12 | 4683.5 | ||
| 161 | Frongoch | In Operation | Near Devil's Bridge | Ceredigion County Council | Aberystwyth Angling Association Ltd | Impounding | 1850 | 7.8 | 145000 | 285 | 72300 | |
| 162 | Tyn-y-Mynydd | In Operation | Betws y Coed | Conwy County Borough Council | Natural Resources Wales (WGWE) | Individual(s) | Impounding | 1850 | 1.5 | 46467 | 240.45 | 42187 | 240.98 |
| 163 | Cribbarth No.1 | In Operation | Risca, Newport | Newport City Council | Dwr Cymru Cyfyngedig | Non Impounding | 1960 | 7.66 | 13910 | 213.36 | 2484 | 213.36 |
| 164 | Dinorwig Surge Pond | In Operation | Near Caernarfon | Gwynedd Council | First Hydro Company | Non Impounding | 1981 | 14 | 36500 | 646 | 4000 | 649 |
| 165 | Llyn Rhos Ddu | In Operation | Anglesey | Isle of Anglesey County Council | Natural Resources Wales (Land) | Impounding | 1994 | 0.35 | 10022 | 7.54 | 32800 | |
| 166 | Windmill Hill | In Operation | Bonymaen, Swansea | City and County of Swansea | Dwr Cymru Cyfyngedig | Non Impounding | 1966 | 5.5 | 16888 | 123.28 | 3300 | 125.28 |
| 167 | Ladyhill | In Operation | Near Newport | Newport City Council | Dwr Cymru Cyfyngedig | Non Impounding | 1954 | 4.6 | 25000 | 5099 | ||
| 168 | Llyn Llywelyn | In Operation | Beddgelert Forest | Gwynedd Council | Natural Resources Wales (WGWE) | Impounding | 1850 | 0.9 | 14200 | 243.01 | 24800 | |
| 169 | Llyn Chwarel | In Operation | Conwy | Conwy County Borough Council | Allied Hydro Power | Impounding | 1920 | 4 | 30000 | 372 | 14200 | 373 |
| 170 | Cwm Celyn | In Operation | Blaina | Blaenau Gwent County Borough Council | Blaenau Gwent County Borough Council | Impounding | Not Known | 4.5 | 12480 | 330.12 | 9892 | 331 |
| 171 | Llyn Rhosrhydd | In Operation | Devil's Bridge | Ceredigion County Council | Aberystwyth Angling Association Ltd | Impounding | 1850 | 6.1 | 105000 | 60700 | ||
| 172 | Bugeilyn | In Operation | Near Machynlleth | Powys County Council | Statkraft Energy Limited | Impounding | 1965 | 7 | 335000 | 455.37 | 14800 | 456.59 |
| 173 | Llyn Arenig Fach | In Operation | Near Bala | Gwynedd Council | Individual(s) | Impounding | 1870 | 2 | 292000 | 454 | 132000 | |
| 174 | Upper Winsle (00427 Lower Reservoir) | In Operation | St Ishmaels | Pembrokeshire County Council | Individual(s) | Impounding | 4.08 | 22461 | 27.141 | 11200 | 28.138 | |
| 175 | Barlwyd Uchaf | In Operation | Blaenau Ffestiniog | Gwynedd Council | J W Greaves & Son Limited | Impounding | 1883 | 5.1 | 16000 | 186 | 15000 | 190 |
| 176 | Llyn Frogwy | In Operation | Bodffordd | Anglesey County Council | Individual(s) | Impounding | 1350 | 6.3 | 26000 | 40.75 | 15800 | 42.22 |
| 177 | Llyn Cyfynwy | In Operation | Near Rhydtalog | Denbighshire County Council | Hafren Dyfrdwy Cyfyngedig | Impounding | 1892 | North Dam: 2.6, South Dam: 2.5 | 140000 | 370.64 | 72800 | North Dam: 371.55, South Dam: |
| 178 | Cairn Mound (0098) | In Operation | Near Brynmawr | Blaenau Gwent County Borough Council | Dwr Cymru Cyfyngedig | Impounding | 1960 | 11 | 94720 | 443.77 | 31600 | 445.54 |
| 179 | Coed-y-Parc | In Operation | Bethesda | Gwynedd Council | Coetir Mynydd | Impounding | 1847 | 8.6 | 12187 | 167.783 | 5203 | 167.783 |
| 180 | Bicton 3 'Lower' | In Operation | St Ishmaels | Pembrokeshire County Council | Bicton Farms Ltd | Impounding | 5.531 | 25560 | 34.457 | 10602 | 35.2 | |
| 181 | River Gele FSA (FRM) | In Operation | Kinmel Bay | Conwy County Borough Council | Natural Resources Wales (FRM) | Impounding | 1960 | 1.1 | 200491 | 250614 | ||
| 182 | Mountain Reservoir | In Operation | Penmaenmawr | Conwy County Borough Council | Dwr Cymru Cyfyngedig | Impounding | 3 | 19602 | 136.93 | |||
| 183 | Penpedairheol Flood Storage Reservoir | In Operation | Near Ystrad Mynach | Caerphilly County Borough Council | Caerphilly County Borough Council | Impounding | 1999 | 8 | 72000 | 207.5 | 31000 | 206.4 |
| 184 | Llyn y Tarw | In Operation | Tregynon | Powys County Council | Individual(s) | Impounding | Not Known | 3.784 | 58500 | 65774 | ||
| 185 | Llyn Peris | In Operation | Near Caernarfon | Gwynedd Council | First Hydro Company | Impounding | 1981 | 4 | 3000000 | 106.25 | 590000 | 107.3 |
| 186 | Ynys-y-Fro Upper | In Operation | Near Newport | Newport City Council | Dwr Cymru Cyfyngedig | Impounding | 1881 | 8 | 86250 | 44.19 | 32376 | 46.8 |
| 187 | Pantyrhuad | In Operation | Llanddowror, St Clears | Carmarthenshire County Council | Individual(s) | Impounding | 7.25 | 19500 | 10000 | |||
| 188 | Bosherston Lake | In Operation | Near Bosherston | Pembrokeshire County Council | The National Trust | Impounding | 1860 | 1 | 433000 | 334000 | ||
| 189 | Beaufort Lower Boat Pond | In Operation | Beaufort | Blaenau Gwent County Borough Council | Blaenau Gwent County Borough Council | Impounding | 4.5 | 24850 | 386.971 | 31500 | ||
| 190 | West Orielton | In Operation | Near Pembroke | Pembrokeshire County Council | David Mason Farms | Impounding | 1820 | 4 | 136000 | 38.64 | 42000 | 40.15 |
| 191 | Llyn-y-Dywarchen | In Operation | Near Rhyd-Ddu | Gwynedd Council | Snowdonia National Park Authority | Impounding | 1850 | Main dam: 4, Subsudiary Dam: 1.5, Llwyn-y-Forwyn: | 100000 | 236.22 | 100000 | Main dam: 237.42, Subsudiary Dam: 236.52, Llwyn-y-Forwyn: 237.22 |
| 192 | Caban Coch | In Operation | Near Rhayader | Powys County Council | Dwr Cymru Cyfyngedig | Impounding | 1904 | 44 | 35531000 | 2023000 | ||
| 193 | Garn Lakes Upper | In Operation | Blaenavon | Torfaen County Borough Council | Torfaen County Borough Council | Impounding | Not Known | 12.595 | 20000 | |||
| 194 | Llyn Ieuan 2 (Ganol) | In Operation | Eisteddfa Gurig | Ceredigion County Council | Natural Resources Wales (WGWE) | Impounding | 1850 | 1.8 | 41121 | 525.19 | 32657 | 526.5 |
| 195 | Cefn Hirgoed No. 1 (327) | In Operation | Pencoed | Bridgend County Borough Council | Dwr Cymru Cyfyngedig | Non Impounding | 1996 | 6.2 | 3800 | |||
| 196 | Pen-y-Fan Pond | In Operation | Near Croespenmaen | Caerphilly County Borough Council | Caerphilly County Borough Council | Impounding | 1794 | 8 | 207600 | 300.92 | 90000 | 302.8 |
| 197 | Bettws Lane | In Operation | Newport | Newport City Council | Newport City Council | Non Impounding | Not Known | 1 | 30000 | 11.2 | 11.2 | |
| 198 | Coity Pond | In Operation | Blaenavon | Torfaen County Borough Council | Walters Resources Limited | Impounding | Not Known | 6.093 | 24000 | 22280 | ||
| 199 | Llwyn Du | In Operation | Monmouth | Monmouthshire County Council | Dwr Cymru Cyfyngedig | Non Impounding | 1913 | 150.876 | 6000 | 152.4 | ||
| 200 | Llyn Bodgylched | In Operation | Beaumaris | Anglesey County Council | Individual(s) | Impounding | 1.375 | 74884 | 100.995 | 102242 | 101.3 | |
| 201 | Cynwyd | In Operation | Cynwyd, nr Corwen, Denbighshire | Denbighshire County Council | Dopower Limited | Impounding | 1923 | 8.8 | 24995 | 264.87 | 14000 | 270 |
| 202 | Cilcain No.2 | In Operation | Cilcain, Near Mold | Flintshire County Council | Dwr Cymru Cyfyngedig | Impounding | 1896 | 8 | 15000 | |||
| 203 | Sluvad No.2 | In Operation | Pontypool | Torfaen County Borough Council | Dwr Cymru Cyfyngedig | Non Impounding | Not Known | 4.2 | 13600 | 142 | 3100 | 144 |
| 204 | Llyn Uchaf & Pwll yr Ardd | In Operation | Llanarthne | Carmarthenshire County Council | National Botanic Garden of Wales | Impounding | 1996 | 5.8 | 12483 | 61.7 | 13150 | 62.8 |
| 205 | Uskmouth Lagoons 4 - 9 | In Operation | Newport | Newport City Council | Natural Resources Wales (Land) | Non Impounding | 1999 | 5.1 | 350000 | 10.4 | 320900 | 10.8 |
| 206 | St y Nyll Upper | In Operation | St Brides-super-Ely | Vale of Glamorgan Council | Individual(s) | Impounding | 5.731 | 13434 | 54.591 | 12621 | 55.4 | |
| 207 | Glanrhyd | In Operation | Pentir | Gwynedd Council | Glan Gwna Estates Ltd | Non Impounding | Not Known | 2.14 | 23523 | 10491 | ||
| 208 | Cwmtillery | In Operation | Near Abertillery | Blaenau Gwent County Borough Council | Dwr Cymru Cyfyngedig | Impounding | 1900 | 15 | 148000 | 342.23 | 40500 | 344.8 |
| 209 | Llyn-y-Gwaith | In Operation | Near Lampeter | Ceredigion County Council | Woodland Investment Management Limited | Impounding | 1886 | 4 | 60000 | 424 | 52000 | |
| 210 | Peterstone Gout | In Operation | Wentlooge | Newport City Council | Natural Resources Wales (FRM) | Impounding | 1960 | 6 | 79073 | 4.7 | 19400 | |
| 211 | Afon Wydden Upper FSA (FRM) | In Operation | Llandudno | Conwy County Borough Council | Natural Resources Wales (FRM) | Impounding | 1995 | 5 | 29000 | 12 | 20700 | |
| 212 | Llyn Fawr | In Operation | Near Rhondda | Rhondda Cynon Taff County Borough Council | Dwr Cymru Cyfyngedig | Impounding | 1914 | 21 | 917000 | 367.9 | 101175 | |
| 213 | Llyn Ogwen | In Operation | Near Bethesda | Gwynedd Council | Penrhyn & Cochwillan Estates | Impounding | 0.4 | 189100 | 302.2 | 378000 | 302.2 | |
| 214 | Waun-y-Pound Middle Lake | In Operation | Ebbw Vale | Blaenau Gwent County Borough Council | Fragile Limited | Impounding | 1929 | 4.5 | 22146 | 369.607 | 11500 | 371.719 |
| 215 | Canada Lake | In Operation | Creigiau | Cardiff Council | Canada Lodge Management Limited | Impounding | 1866 | 6.713 | 61222 | 55.369 | 19509 | 55.8 |
| 216 | Penderyn | In Operation | Near Aberdare | Rhondda Cynon Taff County Borough Council | Dwr Cymru Cyfyngedig | Impounding | 1865 | 15 | 594000 | 213.36 | 93081 | |
| 217 | Caerphilly Castle Inner Moat | In Operation | Caerphilly | Caerphilly County Borough Council | Cadw | Impounding | 1961 | 4 | 75000 | 86.2 | 53000 | 88.3 |
| 218 | Aled | In Operation | Pentrefoelas / Llansannan | Conwy County Borough Council | Dwr Cymru Cyfyngedig | Impounding | 1934 | 5.3 | 1725000 | 372.78 | 445000 | 374.05 |
| 219 | Garth Lake | In Operation | Near Builth Wells | Powys County Council | Individual(s) | Impounding | 1850 | 4 | 47500 | 165 | 28000 | 165.3 |
| 220 | Duffryn No.1 | In Operation | Bassaleg, Nr Newport | Newport City Council | Dwr Cymru Cyfyngedig | Non Impounding | 1975 | 5.49 | 17000 | 76 | 2644 | 76.67 |
| 221 | Wentwood | In Operation | Near Newport | Newport City Council | Dwr Cymru Cyfyngedig | Impounding | 1904 | 27 | 1845000 | 169974 | ||
| 222 | East Catch Basin (Release Point C) | In Operation | Waterston, Hazelbeach, Milford Haven | Pembrokeshire County Council | Valero Pembrokeshire Oil Terminal Ltd | Impounding | 1968 | 18 | 14073 | 26.52 | 4000 | 27.18 |
| 223 | Waun Pond (0002) | In Operation | Ebbw Vale | Blaenau Gwent County Borough Council | Individual(s) | Blaenau Gwent County Borough Council | Impounding | 1925 | 6 | 100000 | 37900 | ||
| 224 | Crafnant Loop FSA (0036) | In Operation | Trefriw | Conwy County Borough Council | Natural Resources Wales (FRM) | Impounding | 2008 | 4 | 90000 | 45900 | ||
| 225 | Wenallt | In Operation | Cardiff | Cardiff Council | Dwr Cymru Cyfyngedig | Non Impounding | 1928 | 7 | 68190 | 11100 | ||
| 226 | Llyn Glandwgan | In Operation | Near Devil's Bridge | Ceredigion County Council | Aberystwyth Angling Association Ltd | Impounding | 1825 | 6 | 115000 | 72800 | ||
| 227 | Cockett | In Operation | Sketty, Swansea | City and County of Swansea | Dwr Cymru Cyfyngedig | Non Impounding | 1955 | 5.7 | 13025 | 175 | 2562 | 177 |
| 228 | Llyn-y-Mynydd | In Operation | Near Llangynog | Powys County Council | Individual(s) | Impounding | 70000 | 38000 | ||||
| 229 | Neuadd Upper | In Operation | Near Merthyr Tydfil | Powys County Council | Dwr Cymru Cyfyngedig | Impounding | 1902 | 26 | 268000 | 457.97 | 220000 | |
| 230 | Beaufort Upper Boat Pond | In Operation | Beaufort | Blaenau Gwent County Borough Council | Blaenau Gwent County Borough Council | Impounding | 5 | 24900 | 391.731 | 16640 | ||
| 231 | Stumpy | In Operation | Barry | Vale of Glamorgan Council | Dwr Cymru Cyfyngedig | Non Impounding | 1955 | 5 | 15552 | 79 | 3888 | 80 |
| 232 | Moss House Wood | In Operation | Near Tonna | Neath Port Talbot County Borough Council | Neath Port Talbot County Borough Council | Impounding | 1889 | 22 | 90900 | 115.83 | 9678 | 116.79 |
| 233 | Dol-y-Mynach | In Operation | Near Rhayader | Powys County Council | Dwr Cymru Cyfyngedig | Impounding | 1904 | 10.7 | 730000 | 36423 | ||
| 234 | Alwen | In Operation | Near Denbigh | Conwy County Borough Council | Dwr Cymru Cyfyngedig | Impounding | 1918 | 30 | 14564200 | 362.71 | 1490000 | 365 |
| 235 | Marsh's Pool | In Operation | Near Llangurig | Powys County Council | Glanrhyd & Penllyn Trust | Impounding | 4 | 55454 | ||||
| 236 | Sluvad No.1 | In Operation | Pontypool | Torfaen County Borough Council | Dwr Cymru Cyfyngedig | Non Impounding | Not Known | 4.2 | 13600 | 142 | 3100 | 144 |
| 237 | Court Farm | In Operation | Near Caerleon | Monmouthshire County Council | Dwr Cymru Cyfyngedig | Non Impounding | 1986 | 16 | 264000 | 40000 | ||
| 238 | Ref 6 | In Operation | Amlwch | Anglesey County Council | Parys Mountain Mines Ltd | Impounding | Not Known | 2 | 15184 | 20245 | ||
| 239 | Bryngwyn New | In Operation | Llandeilo | Carmarthenshire County Council | Dwr Cymru Cyfyngedig | Non Impounding | 1991 | 258 | 3600 | 260 | ||
| 240 | Llyn yr Wyth Eidion | In Operation | Llangefni | Anglesey County Council | Natural Resources Wales (Land) | Impounding | 1994 | 1.2 | 36000 | 60000 | ||
| 241 | Schwyll No.1 | In Operation | Ogmore Village | Vale of Glamorgan Council | Dwr Cymru Cyfyngedig | Non Impounding | 1963 | 19.2 | 13640 | 17.8 | ||
| 242 | Bolton Hill Upper | In Operation | Haverfordwest | Pembrokeshire County Council | Dwr Cymru Cyfyngedig | Non Impounding | Not Known | 6 | 16272 | 3600 | ||
| 243 | Uskmouth Lagoon 10 | In Operation | Newport | Newport City Council | Natural Resources Wales (Land) | Non Impounding | 1990 | 6 | 50000 | 119028 | ||
| 244 | Canaston Bridge | In Operation | Haverfordwest | Pembrokeshire County Council | Dwr Cymru Cyfyngedig | Non Impounding | 1980 | 5 | 12000 | 8.5 | 6850 | 9.5 |
| 245 | Tyn-y-Waun | In Operation | Treherbert | Rhondda Cynon Taff County Borough Council | Dwr Cymru Cyfyngedig | Non Impounding | Not Known | 24230 | 5871 | |||
| 246 | Brymbo Pool Pond | In Operation | Brymbo, nr Wrexham | Wrexham County Borough Council | Brymbo Developments Limited, Parkhill Group of Companies | Impounding | 1958 | 22300 | 251.28 | 11400 | ||
| 247 | Beacons | In Operation | Near Merthyr Tydfil | Powys County Council | Dwr Cymru Cyfyngedig | Impounding | 1897 | 18 | 1577300 | 206000 | ||
| 248 | Warren Mill | In Operation | Vale of Glamorgan Council | Individual(s) | Impounding | 1650 | 5 | 16162 | 16519 | |||
| 249 | Llyn Pen-y-Gwryd | In Operation | Near Capel Curig | Gwynedd Council | Individual(s) | Impounding | 1928 | 2.5 | 20655 | 25037 | ||
| 250 | Felindre | In Operation | Near Swansea | City and County of Swansea | Dwr Cymru Cyfyngedig | Non Impounding | 1972 | 8 | 143200 | 129.54 | 26000 | 129.54 |
| 251 | Stwlan | In Operation | Near Blaenau Ffestiniog | Gwynedd Council | First Hydro Company | Impounding | 1962 | 34 | 1700000 | 502.92 | 118370 | 503.97 |
| 252 | Cwm Rheidol | In Operation | Near Aberystwyth | Ceredigion County Council | Statkraft Energy Limited | Impounding | 1965 | 12 | 675000 | 47.24 | 231000 | 49.07 |
| 253 | Llieidi Upper | In Operation | Near Llanelli | Carmarthenshire County Council | Dwr Cymru Cyfyngedig | Impounding | 1905 | 16 | 827000 | 125000 | ||
| 254 | Llyn Gweryd | In Operation | Near Mold | Denbighshire County Council | Individual(s) | Impounding | 1870 | 5 | 50000 | 320.56 | 50000 | 321.53 |
| 255 | Pont y Cerbyd FSA (FRM) | In Operation | Solva | Pembrokeshire County Council | Natural Resources Wales (FRM) | Impounding | 1990 | 1.67 | 30500 | 35000 | ||
| 256 | Carew Mill Pond | In Operation | Near Tenby | Pembrokeshire County Council | Pembrokeshire Coast National Park Authority | Impounding | 1801 | 5 | 86000 | 93000 | ||
| 257 | Llyn Brianne | In Operation | Near Llandovery | Ceredigion County Council | Dwr Cymru Cyfyngedig | Impounding | 1972 | 90 | 64400000 | 220000 | ||
| 258 | Cyfarthfa Park Lake | In Operation | Near Merthyr Tydfil | Merthyr Tydfil County Borough Council | Merthyr Tydfil County Borough Council | Impounding | 1875 | 2 | 26000 | 24000 | ||
| 259 | Rhymney Bridge No.2 | In Operation | Near Merthyr Tydfil | Caerphilly County Borough Council | Dwr Cymru Cyfyngedig | Impounding | 1901 | 18.49 | 193209 | 355.75 | 29000 | 358.49 |
| 260 | Llygad Rheidol | In Operation | Near Aberystwyth | Ceredigion County Council | Dwr Cymru Cyfyngedig | Impounding | 1880 | 10 | 295000 | 509.04 | 597000 | |
| 261 | Dingestow Court Lake | In Operation | Monmouthshire | Monmouthshire County Council | Individual(s) | Impounding | 1979 | 3.79 | 27000 | 37.17 | 14375 | |
| 262 | Butetown | In Operation | Near Rhymney | Caerphilly County Borough Council | Caerphilly County Borough Council | Impounding | 1850 | 9 | 213662 | 324.67 | 60694 | 325.93 |
| 263 | Graigllwyd Springs | In Operation | Penmaenmawr, Conwy | Conwy County Borough Council | Individual(s) | Non Impounding | 1927 | 8.2 | 18184 | 136.85 | 5383 | 137.5 |
| 264 | Nant-y-Geifr | In Operation | Llanidloes | Powys County Council | Hafren Dyfrdwy Cyfyngedig | Impounding | 1899 | 9.75 | 15148 | 289.56 | 6492 | 291.08 |
| 265 | Fairwood Lake | In Operation | Swansea | City and County of Swansea | Swansea City Association Football Club Limited | Impounding | 1850 | 3 | 25000 | 21000 | ||
| 266 | Rhaslas Pond | In Operation | Near Merthyr Tydfil | Caerphilly County Borough Council | Merthyr (South Wales) Limited | Impounding | 1869 | North Embankment: 4, South Embankment: 4 | 210000 | 404.75 | 102000 | North Embankment: 406, South Embankment: |
| 267 | Waun-y-Pound Upper (0199) | In Operation | Near Ebbw Vale | Blaenau Gwent County Borough Council | Fragile Limited | Impounding | 1929 | 9.23 | 82591 | 378.62 | 25208 | 381.1 |
| 268 | Tongwynlais No.1 | In Operation | Tongwynlais | Cardiff Council | Dwr Cymru Cyfyngedig | Non Impounding | 1965 | 6.1 | 18000 | 111.3 | 4500 | 111.8 |
| 269 | Llyn Cae Conroy Upper | In Operation | Llanbrynmair | Powys County Council | Individual(s) | Impounding | 1852 | 15.44 | 46595 | 218.92 | 12850 | 221.44 |
| 270 | Moss Valley Fishing Lake | In Operation | Brynteg, Wrexham | Wrexham County Borough Council | Wrexham County Borough Council | Impounding | 1973 | 1.45 | 14200 | 9900 | ||
| 271 | Pysgodlyn Mawr | In Operation | Llanddunwud / Welsh St Donat's | Vale of Glamorgan Council | Natural Resources Wales (WGWE) | Impounding | 1870 | 1.7 | 17630 | 112.66 | 11919 | |
| 272 | Cwellyn | In Operation | Near Waunfawr | Gwynedd Council | Dwr Cymru Cyfyngedig | Impounding | 1979 | 4.1 | 1687000 | 141.15 | 870000 | 143.1 |
| 273 | Trawsfynydd | In Operation | Near Trawsfyndd | Gwynedd Council | Magnox Limited | Impounding | 1991 | Maentwrog New Dam: 40.4, Trawsfynydd East & West Saddle: 6.4, Hendre Mur Saddle: 5.5, Gyfynys Saddle: 11 | 33190000 | 198.25 | 5380000 | Maentwrog New Dam: 201.42, Trawsfynydd East & West Saddle: 199.34, Hendre Mur Saddle: 199.34, Gyfynys Saddle: 199.34 |
| 274 | New Pool | In Operation | Ceri / Kerry | Powys County Council | Natural Resources Wales (WGWE) | Impounding | 1850 | 14 | 44500 | 8934 | ||
| 275 | Llyn nr Llanhari Tre-Fran | In Operation | Llanhari | Rhondda Cynon Taff County Borough Council | Persimmon Homes West Wales | Non Impounding | 1980 | 5.672 | 16020 | 56.128 | 15350 | 58.672 |
| 276 | Llyn Tegid (FRM) | In Operation | Bala | Gwynedd Council | Natural Resources Wales (FRM) | Impounding | 1956 | 4 | 21878121 | 162.87 | 400000 | |
| 277 | Oakenholt (0197) | In Operation | Near Flint | Flintshire County Council | Essity Operations Manchester Ltd. | Impounding | 1876 | 15 | 83500 | 31.39 | 19600 | 33 |
| 278 | Flour Mill | In Operation | Near Holywell | Flintshire County Council | Flintshire County Council | Impounding | 1790 | 4 | 26000 | 34.92 | 14000 | 35 |
| 279 | Keeper's (Pen-Ffordd-Goch) Pond | In Operation | B4246 Blaenavon | Monmouthshire County Council | Brecon Beacons National Park Authority | Impounding | 1800 | 4 | 21850 | 14400 | ||
| 280 | Llyn Bowydd | In Operation | Near Blaenau Ffestiniog | Gwynedd Council | J W Greaves & Son Limited | Impounding | 1860 | 4 | 68000 | 124726 | 81000 | |
| 281 | Nantddeiliog | In Operation | Near Dylife | Powys County Council | Individual(s) | Impounding | 29600 | 18500 | ||||
| 282 | Gwastad Mawr Flood Storage Area | In Operation | Newport | Newport City Council | Newport City Council | Impounding | 1930 | 10.2 | 600000 | 460000 | ||
| 283 | Corwen | In Operation | Corwen | Denbighshire County Council | Dwr Cymru Cyfyngedig | Impounding | 1800 | 3 | 16000 | 295.79 | 297.42 | |
| 284 | Llyn Gludy | In Operation | Near Brecon | Powys County Council | Individual(s) | Impounding | 1850 | 4.8 | 66000 | 168 | 31500 | 168.8 |
| 285 | Aled Isaf | In Operation | Near Denbigh | Conwy County Borough Council | Dwr Cymru Cyfyngedig | Impounding | 1939 | 15 | 1137810 | 365.76 | 304000 | 367.59 |
| 286 | Bryn Mulan (Ty Mawr) | In Operation | Prion, Denbigh | Denbighshire County Council | Individual(s) | Impounding | 1900 | 6 | 19244 | 6615 | ||
| 287 | Firewater Pond | In Operation | Milford Haven | Pembrokeshire County Council | Dragon LNG Ltd | Non Impounding | 1967 | 4 | 10416 | 47.8 | 3472 | 48.8 |
| 288 | Hendre Ddu Upper | In Operation | Dyfi Forest, Aberangell | Gwynedd Council | Natural Resources Wales (WGWE) | Impounding | 1897 | 12 | 25500 | 6500 | ||
| 289 | Garn Lakes LNR Lower | In Operation | Blaenavon | Torfaen County Borough Council | Torfaen County Borough Council | Impounding | 1995 | 7.022 | 30976.78 | 17335 | ||
| 290 | Ref 4 | In Operation | Amlwch | Anglesey County Council | Parys Mountain Mines Ltd | Impounding | Not Known | 1 | 15005 | 15005 | ||
| 291 | Llyn Geirionydd | In Operation | Near Llanrwst | Conwy County Borough Council | Trefriw Woollen Mills Limited | Impounding | 1944 | 0.65 | 150000 | 210 | 250000 | |
| 292 | Glaslyn | In Operation | Pen-y-Pass, Beddgelert | Gwynedd Council | RWE Generation UK PLC | Impounding | 1850 | 0.86 | 86788 | 598.95 | 83194 | 599.71 |
| 293 | Blaen-y-Cwm | In Operation | Near Ebbw Vale | Blaenau Gwent County Borough Council | Dwr Cymru Cyfyngedig | Impounding | 1922 | Main Embankment: 22.6, Clydach Dam: | 1236000 | 417.545 | 210000 | Main Embankment: 420.25, Clydach Dam: 418.49 |
| 294 | Mochdre | In Operation | Newtown | Powys County Council | Individual(s) | Impounding | 23.19 | 17761 | 199.38 | 10299 | 201.2 | |
| 295 | Ysceifiog Lake | In Operation | Near Mold | Flintshire County Council | Individual(s) | Impounding | 1904 | 5 | 93400 | 122.27 | 60000 | 123.8 |
| 296 | St James Park | In Operation | Tredegar | Blaenau Gwent County Borough Council | Blaenau Gwent County Borough Council | Impounding | Not Known | 9.43 | 22116 | 375 | 14000 | 377.76 |
| 297 | Marchlyn Mawr | In Operation | Near Bangor | Gwynedd Council | First Hydro Company | Impounding | 2007 | 70.3 | 6700000 | 634 | 269000 | |
| 298 | Morriston | In Operation | Morriston, Swansea | City and County of Swansea | Dwr Cymru Cyfyngedig | Non Impounding | 1910 | 2.5 | 20626 | 104.24 | 3700 | 107 |
| 299 | Parc Cwm Darran | In Operation | Fochriw | Caerphilly County Borough Council | Caerphilly County Borough Council | Impounding | 3.484 | 20000 | 271.863 | 24488 | ||
| 300 | Pant-yr-Eos | In Operation | Near Newport | Newport City Council | Dwr Cymru Cyfyngedig | Impounding | 1878 | 29 | 597000 | 125 | 64752 | 126.98 |
| 301 | Llyn-yr-Oerfa | In Operation | Devil's Bridge | Ceredigion County Council | Aberystwyth Angling Association Ltd | Impounding | 1850 | 9 | 82000 | 33000 | ||
| 302 | Cowlyd | In Operation | Near Dolgarrog | Conwy County Borough Council | RWE Generation UK PLC | Impounding | 1920 | 15 | 9430000 | 366.27 | 1090000 | 367.66 |
| 303 | Maesmawr | In Operation | Near Welshpool | Powys County Council | Individual(s) | Impounding | 1815 | 9 | 95000 | 220 | 53000 | |
| 304 | Penycae Lower | In Operation | Near Penycae | Wrexham County Borough Council | Hafren Dyfrdwy Cyfyngedig | Impounding | 1872 | 10.2 | 39000 | 200.62 | 13000 | 202.62 |
| 305 | Rosemoor | In Operation | Walwyn's Castle, Haverfordwest | Pembrokeshire County Council | Redrose Limited | Impounding | 1977 | 3.287 | 10000 | 20000 | ||
| 306 | Festival Lake | In Operation | Ebbw Vale | Blaenau Gwent County Borough Council | Blaenau Gwent County Borough Council | Impounding | 1997 | 22.142 | 11546 | |||
| 307 | Tredegar Park Golf Course Flood Attenuation Reservoir | In Operation | Newport | Newport City Council | Newport City Council | Non Impounding | 2015 | 3.5 | 85000 | 16.75 | 45000 | 17.6 |
| 308 | Brenig | In Operation | Near Denbigh | Conwy County Borough Council | Dwr Cymru Cyfyngedig | Impounding | 1975 | 53.2 | 61500000 | 377 | 3725000 | 380 |
| 309 | Llyn Crafnant (0196) | In Operation | Near Trefriw | Conwy County Borough Council | The Crafnant Trust (The Charity of Richard James) | Impounding | 1874 | 3 | 500000 | 182.32 | 216000 | 183.23 |
| 310 | Lliw Lower | In Operation | Near Swansea | City and County of Swansea | Dwr Cymru Cyfyngedig | Impounding | 1978 | 30 | 1220000 | 131000 | ||
| 311 | Llantarnam | In Operation | Torfaen | Torfaen County Borough Council | Dwr Cymru Cyfyngedig | Non Impounding | 1926 | 5.5 | 23450 | 61.57 | 4900 | 61.57 |
| 312 | Llyn yr Oerfel | In Operation | Gwynedd Council | The Crown Estate Commissioners | Impounding | 3.937 | 33507 | 306.368 | 32136 | 307.1 | ||
| 313 | Brombil | In Operation | Margam | Neath Port Talbot County Borough Council | Individual(s) | Impounding | 1780 | 11.5 | 20000 | 109.18 | 5714 | 110.48 |
| 314 | Crown Farm | In Operation | Raglan | Monmouthshire County Council | AJ Jones & Sons | Impounding | 24123.9 | 69.167 | 20725 | |||
| 315 | Bog Pond | In Operation | Ponterwyd | Ceredigion County Council | Individual(s) | Impounding | 1840 | 12 | 100000 | 323.5 | 50000 | 324 |
| 316 | Cowbridge & Llanblethian FSA (FRM) | In Operation | Cowbridge | Y Bont Faen | Vale of Glamorgan Council | Natural Resources Wales (FRM) | Impounding | 2006 | 4.4 | 411000 | 29 | 450000 | |
| 317 | Llyn Cwm Annell | In Operation | Near Llanwrtyd Wells | Powys County Council | Individual(s) | Impounding | 1870 | 15 | 65000 | 175 | 14500 | |
| 318 | Nant Moel | In Operation | Near Aberdare | Rhondda Cynon Taff County Borough Council | Dwr Cymru Cyfyngedig | Impounding | 1898 | 25.3 | 318000 | 263.347 | 46000 | 264.85 |
| 319 | Llyn Dulyn | In Operation | Near Tal-y-Bont | Conwy County Borough Council | RWE Generation UK PLC | Impounding | 1881 | 2.74 | 1091000 | 534.81 | 135000 | 535.31 |
| 320 | Waltwood | In Operation | Underwood, Newport | Newport City Council | Tata Steel UK Limited | Non Impounding | 1960 | 7.77 | 454000 | 63.4 | 90000 | 63.4 |
| 321 | Cefn Mably No.1 | In Operation | Pontprennau | Cardiff Council | Dwr Cymru Cyfyngedig | Non Impounding | 1965 | 6.2 | 27900 | 69 | 1160000 | 71 |
| 322 | Claerwen | In Operation | Near Rhayader | Powys County Council | Dwr Cymru Cyfyngedig | Impounding | 1952 | 67 | 48694000 | 368.96 | 2630000 | 9.1 |
| 323 | Llyn Mair | In Operation | Near Maentwrog | Gwynedd Council | Snowdonia National Park Authority | Impounding | 1780 | 3 | 63000 | 78.02 | 60000 | 78.68 |
| 324 | Llyn Conach | In Operation | Near Machynlleth | Ceredigion County Council | Individual(s) | Impounding | 5 | 90000 | 94000 | |||
| 325 | Court Colman (265) | In Operation | Bridgend | Bridgend County Borough Council | Dwr Cymru Cyfyngedig | Non Impounding | 1962 | 6 | 12408 | 114.3 | 2800 | 114 |
| 326 | Llyn Llwydiarth | In Operation | Llanfihangel | Powys County Council | Individual(s) | Impounding | 1500 | 3 | 18538 | 1.25 | 25365 | 228.6 |
| 327 | Bryn Bras | In Operation | Llanrug | Gwynedd Council | Park Leisure 2000 Ltd | Impounding | 1900 | NW Dam: 2.861, NE Dam: 2.267 | 77711 | 179.971 | 46949 | NW Dam: 180.83, NE Dam: 180.71 |
| 328 | Frampton FSA (FRM) | In Operation | Llantwit Major | Vale of Glamorgan Council | Natural Resources Wales (FRM) | Impounding | 1998 | 2.25 | 11310 | 55.75 | 17700 | 2.7 |
| 329 | Penllergare Valley Woods Upper Lake | In Operation | Penllegare, Swansea | City and County of Swansea | Ymddiriedolaeth Penllergare - The Penllergare Trust | Impounding | 1850 | 3 | 13500 | 9400 | ||
| 330 | Hawarden Castle Fish Pond | In Operation | Hawarden, Flintshire | Flintshire County Council | Individual(s) | Impounding | 3.5 | 10800 | 34.5 | 12000 | 35 | |
| 331 | Arenig Fawr | In Operation | Near Llidiardau | Gwynedd Council | Dwr Cymru Cyfyngedig | Impounding | 1864 | 4.3 | 1100000 | 401 | 340000 | 405.28 |
| 332 | Rhug Hall Lake | In Operation | Corwen | Denbighshire County Council | Individual(s) | Impounding | 1888 | 4.315 | 35470 | 145.716 | 12914 | 146.526 |
| 333 | Cilcain No.1 | In Operation | Cilcain, Near Mold | Flintshire County Council | Dwr Cymru Cyfyngedig | Impounding | 1889 | 15700 | ||||
| 334 | Ty Canol | In Operation | Baglan | Neath Port Talbot County Borough Council | Dwr Cymru Cyfyngedig | Non Impounding | 1974 | 6.28 | 24440 | 73.24 | 4719 | 73.28 |
| 335 | Cynwch | In Operation | Near Dolgellau | Gwynedd Council | Dwr Cymru Cyfyngedig | Impounding | 1968 | 1 | 255000 | 223.65 | 106000 | 224.33 |
| 336 | Cilcain No.3 | In Operation | Near Cilcain | Flintshire County Council | Dwr Cymru Cyfyngedig | Impounding | 1902 | 8.7 | 36370 | 269.75 | 9100 | 270.89 |
| 337 | Llyn Eigiau | In Operation | Near Dolgarrog | Conwy County Borough Council | RWE Generation UK PLC | Impounding | 1996 | 1 | 415000 | 372 | 342000 | 372.186 |
| 338 | Bolton Hill | In Operation | Haverfordwest | Pembrokeshire County Council | Dwr Cymru Cyfyngedig | Non Impounding | 1980 | 6 | 25000 | 98 | 6650 | 100 |
| 339 | Castell Nos | In Operation | Near Maerdy | Rhondda Cynon Taff County Borough Council | Dwr Cymru Cyfyngedig | Impounding | 1881 | 14 | 90909 | 20000 | ||
| 340 | Cors-y-Llyn | In Operation | Builth Wells | Powys County Council | Natural Resources Wales (Land) | Impounding | 2002 | 1.65 | 90706 | 76870 | ||
| 341 | Llyn Elsi | In Operation | Near Betws-y-Coed | Conwy County Borough Council | Allied Hydro Power Limited | Impounding | 1911 | Elsi North Dam: 5.5, Elsi South East Dam: 3, Elsi South West Dam: 3 | 364000 | 226.53 | 106000 | Elsi North Dam: 228.68, Elsi South East Dam: , Elsi South West Dam: |
| 342 | Cwm-y-Foel | In Operation | nr Blaenau Ffestiniog | Gwynedd Council | RWE Generation UK PLC | Impounding | 1999 | 7 | 48000 | 442.65 | 30000 | 443.4 |
| 343 | Sandmartin Lake | In Operation | Swyddffynnon, Tregaron | Ceredigion County Council | Individual(s) | Impounding | 2012 | 3.406 | 26920 | 13460 | ||
| 344 | Cefn Hirgoed No. 2 (101) | In Operation | Near Bridgend | Bridgend County Borough Council | Dwr Cymru Cyfyngedig | Non Impounding | 1996 | 5 | 29700 | 5657 | ||
| 345 | Bodlyn | In Operation | Near Tal-y-Bont | Gwynedd Council | Dwr Cymru Cyfyngedig | Impounding | 1894 | 3.31 | 763223 | 383.59 | 169000 | 384.48 |
| 346 | Schwyll No.2 | In Operation | Ogmore | Vale of Glamorgan Council | Dwr Cymru Cyfyngedig | Non Impounding | 19.2 | 13640 | 17.8 | 4090.35 | ||
| 347 | Fachwen Pool | In Operation | Near Newtown | Powys County Council | Severnside & Newtown Angling Club | Impounding | 4 | 90000 | 185 | 45000 | 185.3 | |
| 348 | Stocks Lake | In Operation | Monmouth | Monmouthshire County Council | Individual(s) | Impounding | 2000 | 4.05 | 12000 | 7000 | ||
| 349 | Jepson's Pond | In Operation | Near Dowlais | Caerphilly County Borough Council | Caerphilly County Borough Council | Impounding | 1873 | 6 | 77054 | 398.89 | 19291 | 400.49 |
| 350 | Fuches Las | In Operation | Llanrwst | Conwy County Borough Council | Natural Resources Wales (WGWE) | Impounding | 1812 | 2.63 | 11453 | 152.4 | 10346 | 153.18 |
| 351 | New Pond, Dowlais | In Operation | Near Merthyr Tydfil | Merthyr Tydfil County Borough Council | Merthyr Tydfil County Borough Council | Impounding | 1875 | 7 | 120030 | 86970 | 371.435 | |
| 352 | Bryn Cowlyd | In Operation | Llanrwst | Conwy County Borough Council | Dwr Cymru Cyfyngedig | Non Impounding | 1998 | 12500 | 159.95 | 2500 | 161.83 | |
| 353 | Ref 2 | In Operation | Amlwch | Anglesey County Council | Parys Mountain Mines Ltd | Impounding | Not Known | 2 | 16052 | 8026 | ||
| 354 | Ty Mawr | In Operation | Near Bronwylfa | Wrexham County Borough Council | Hafren Dyfrdwy Cyfyngedig | Impounding | 1908 | 13.4 | 595000 | 244.08 | 94000 | 245.2 |
| 355 | Llyn Pen Rhaeadr | In Operation | Near Aberystwyth | Ceredigion County Council | Statkraft Energy Limited | Impounding | 1965 | 2 | 100000 | 412.7 | 91000 | 412.7 |
| 356 | Surf Snowdonia | In Operation | Dolgarrog | Conwy County Borough Council | Conwy Adventure Leisure Limited | Non Impounding | 2014 | 3.01 | 40000 | 6.38 | 30000 | 7.01 |
| 357 | Llynau Diwaunydd | In Operation | Near Dolwyddelan | Conwy County Borough Council | RWE Generation UK PLC | Impounding | 1996 | 1.97 | 60800 | 368 | 152000 | 368.57 |
| 358 | Penycae Upper | In Operation | Near Penycae | Wrexham County Borough Council | Hafren Dyfrdwy Cyfyngedig | Impounding | 1902 | 10.4 | 102000 | 215 | 25500 | 217 |
| 359 | Talybont | In Operation | Near Brecon | Powys County Council | Dwr Cymru Cyfyngedig | Impounding | 1939 | 30 | 11668000 | 188.97 | 1272000 | 190.62 |
| 360 | Nant-y-Maelor | In Operation | Abersychan | Torfaen County Borough Council | Dwr Cymru Cyfyngedig | Impounding | 1850 | 20457 | ||||
| 361 | Garn Pond | In Operation | Blaenavon | Torfaen County Borough Council | Torfaen County Borough Council | Impounding | 7.641 | 11541 | 378.85 | 6329 | ||
| 362 | Llyn Barcud (Bwlch Nant yr Arian) | In Operation | Ponterwyd | Ceredigion County Council | Natural Resources Wales (WGWE) | Impounding | 1990 | 3 | 28000 | 297.93 | 26000 | |
| 363 | Tongwynlais No. 2 | In Operation | Tongwynlais | Cardiff Council | Dwr Cymru Cyfyngedig | Non Impounding | 1990 | 5 | 27450 | 109.3 | 4500 | 111.3 |
| 364 | Egnant | In Operation | Near Pontrhydfendigaid | Ceredigion County Council | Dwr Cymru Cyfyngedig | Impounding | 1965 | 5.6 | 518000 | 421.11 | 185000 | |
| 365 | Clase | In Operation | Clase, Swansea | City and County of Swansea | Dwr Cymru Cyfyngedig | Non Impounding | 1953 | 5 | 19658 | 164.8 | 4836 | 166.8 |
| 366 | Pandorra Upper | In Operation | Gwydyr Forest, Betws-y-Coed | Conwy County Borough Council | Natural Resources Wales (WGWE) | Impounding | 1870 | 2 | 12060 | 6030 | ||
| 367 | Pond-y-Gwaith | In Operation | Near Pontrhydfendigaid | Ceredigion County Council | Dwr Cymru Cyfyngedig | Impounding | 1900 | 4 | 67000 | 48000 | ||
| 368 | Clydach | In Operation | Near Ynysybwl | Rhondda Cynon Taff County Borough Council | Dwr Cymru Cyfyngedig | Impounding | 1900 | 10 | 55909 | 16188 | ||
| 369 | Challenger Fishing Lake | In Operation | Nantgaredig, Carmarthen | Carmarthenshire County Council | Individual(s) | Impounding | 1993 | 1.95 | 17469 | 18486 | ||
| 370 | Llywernog Pond | In Operation | Llywernog, Aberystwyth | Ceredigion County Council | Individual(s) | Impounding | Not Known | 4 | 23736 | 250 | 37000 | 250 |
| 371 | Craig-y-Pistyll | In Operation | Near Aberystwyth | Ceredigion County Council | Dwr Cymru Cyfyngedig | Impounding | 1877 | 13 | 366000 | 325.25 | 112000 | |
| 372 | Llyn Alarch | In Operation | Builth Wells | Powys County Council | Groe Park and Irfon Angling Club | Impounding | 1900 | 5.8 | 10000 | 138.5 | 7850 | 138.3 |
| 373 | Llyn Du | In Operation | Pontdolgoch | Powys County Council | Individual(s) | Impounding | 3.5 | 130000 | 408 | 43000 | 386.591 | |
| 374 | Bolton Hill Lower | In Operation | Haverfordwest | Pembrokeshire County Council | Dwr Cymru Cyfyngedig | Non Impounding | Not Known | 4 | 18939 | 5625 | ||
| 375 | Sloblands Lagoons | In Operation | Newport | Newport City Council | GFG Estates P11 Ltd. | Non Impounding | 1930 | 4 | 108105 | 8.83 | 180029 | |
| 376 | Llyn Cob | In Operation | Aberllefenni, Corris | Gwynedd Council | David Meredith & Sons Ltd. | Impounding | 1800 | 3.969 | 5704 | 8000 | ||
| 377 | Blaen Bran | In Operation | Near Upper Cwmbran | Torfaen County Borough Council | Eurolago e Foresta Limited | Impounding | 1890 | 15.7 | 51818 | 276.15 | 11614 | 277.42 |
| 378 | Ref 7 | In Operation | Amlwch | Anglesey County Council | Parys Mountain Mines Ltd | Impounding | Not Known | 1.25 | 15002 | 15434 | ||
| 379 | Coedty | In Operation | Near Dolgarrog | Conwy County Borough Council | RWE Generation UK PLC | Impounding | 1924 | 13 | 300000 | 269.06 | 76000 | 270.25 |
| 380 | Nant Hir | In Operation | Near Aberdare | Rhondda Cynon Taff County Borough Council | Dwr Cymru Cyfyngedig | Impounding | 1875 | 24.4 | 181818 | 259.08 | 22600 | 261.03 |
| 381 | Birchgrove | In Operation | Near Neath | City and County of Swansea | Dwr Cymru Cyfyngedig | Non Impounding | 1973 | 5 | 46900 | 9490 | ||
| 382 | Uskmouth Lagoon 11 | In Operation | Newport | Newport City Council | Natural Resources Wales (Land) | Non Impounding | 1990 | 6 | 25000 | 55263 | ||
| 383 | Craig Goch | In Operation | Near Rhayader | Powys County Council | Dwr Cymru Cyfyngedig | Impounding | 1904 | 37 | 9220000 | 317 | 878000 | 321.6 |
| 384 | Goldcliff Lagoons 1, 2 & 3 | In Operation | Newport | Newport City Council | Natural Resources Wales (Land) | Impounding | 1960 | 2.14 | 410046 | 273363 | 8.1 | |
| 385 | Blaenmelindwr | In Operation | Near Ponterwyd | Ceredigion County Council | Aberystwyth Angling Association Ltd | Impounding | 1850 | 6 | 90000 | 56100 | ||
| 386 | Plas Devon FSA (FRM) | In Operation | Rossett, Wrexham | Flintshire County Council | Natural Resources Wales (FRM) | Impounding | 1960 | 4 | 25000 | 25000 | ||
| 387 | Lower Quarry Pit | In Operation | Conwy | Conwy County Borough Council | Allied Hydro Power | Impounding | Not Known | 46 | 407000 | 309 | 11000 | 318 |
| 388 | Coed Darcy North Site | In Operation | Llandarcy | Neath Port Talbot County Borough Council | St Modwen Properties PLC | Impounding | 1923 | 10.3 | 403000 | 30.6 | 94000 | |
| 389 | Cefn Mably Lodge Lake | In Operation | Near Cardiff | Caerphilly County Borough Council | W. R . Jones & Sons | Impounding | 1993 | 4 | 36500 | 16500 | ||
| 390 | Tecwyn Uchaf | In Operation | Near Llandecwyn | Gwynedd Council | Dwr Cymru Cyfyngedig | Impounding | 1896 | 1.7 | 1031000 | 156.21 | 125000 | 156.74 |
| 391 | Llyn-y-Fan Fach | In Operation | Near Llanddeusant | Carmarthenshire County Council | Dwr Cymru Cyfyngedig | Impounding | 1919 | 10 | 990000 | 1010000 | ||
| 392 | Crai No.2 | In Operation | Pen y Cae, Powys | Powys County Council | Dwr Cymru Cyfyngedig | Non Impounding | 1995 | 5.5 | 10400 | 263 | 2504 | 260 |
| 393 | Bran | In Operation | Near Bylchau | Denbighshire County Council | Dwr Cymru Cyfyngedig | Impounding | 1898 | 3.6 | 257000 | 434.43 | 136000 | 435.19 |
| 394 | Perthcelyn | In Operation | Near Mountain Ash | Rhondda Cynon Taff County Borough Council | ACMS Investments Ltd | Non Impounding | 1903 | 11 | 143500 | 19000 | ||
| 395 | Nant-y-Moch | In Operation | Near Ponterwyd | Ceredigion County Council | Statkraft Energy Limited | Impounding | 1962 | 56 | 32564000 | 339.24 | 2630000 | 341.52 |
| 396 | Caerphilly Castle Outer Moat | In Operation | Caerphilly | Caerphilly County Borough Council | Cadw | Impounding | 1961 | 5 | 10000 | 82.3 | 7000 | 84.8 |
| 397 | Crude Impounding Basin | In Operation | Near Milford Haven | Pembrokeshire County Council | Puma Energy (UK) Limited | Impounding | 1974 | 8.9 | 97500 | 37.58 | 31000 | 37.58 |
| 398 | Llyn Cwm Nantcol | In Operation | Llanbedr | Gwynedd Council | David Cooke (Nantcol) Ltd | Impounding | 1917 | 11.217 | 26490 | 72.265 | 10239 | 72.8 |
| 399 | St. Pierre Lake | In Operation | Near Chepstow | Monmouthshire County Council | Marriott International Incorporated | Impounding | 1800 | 4 | 43400 | 34000 | ||
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