List of dams and reservoirs in the United Kingdom

England

Buckinghamshire

• Foxcote Reservoir, north of Buckingham
• Weston Turville Reservoir, between Weston Turville and Wendover

  Cambridgeshire

• Grafham Water

  Cheshire

• Bollinhurst Reservoir
• Bosley Reservoir, Bosley
• Horse Coppice Reservoir
• Lamaload Reservoir, east of Macclesfield
• Ridgegate Reservoir and Trentabank Reservoir, south-east of Macclesfield
• Sutton Reservoir, south of Macclesfield

  Cornwall

• Argal and College Reservoirs, Falmouth
• Boscathnoe Reservoir, Penzance
• Bussow Reservoir, St Ives
• Cargenwen Reservoir
• Colliford Lake, Bodmin Moor
• Crowdy Reservoir, Bodmin Moor
• Drift Reservoir, Penzance
• Porth Reservoir, Newquay
• Siblyback Lake, Bodmin Moor
• Stithians Reservoir
• Upper Tamar Lake

  County Durham

• Balderhead Reservoir
• Blackton Reservoir
• Burnhope Reservoir
• Derwent Reservoir
• Grassholme Reservoir
• Hisehope Reservoir
• Hurworth Burn Reservoir
• Hury Reservoir
• Selset Reservoir
• Smiddy Shaw Reservoir
• Tunstall Reservoir
• Waskerley Reservoir

  Cumbria

• Borrans Reservoir, north of Windermere
• Castle Carrock Reservoir
• Chapelhouse Reservoir, south-east of Uldale
• Cow Green Reservoir east of Dufton Fell
• Dubbs Reservoir, north of Windermere
• Ennerdale Water
• Fisher Tarn east of Kendal
• Harlock Reservoir, Pennington Reservoir, Poaka Beck Reservoir west of the town of Ulverston
• Haweswater Reservoir
• Hayeswater
• Kentmere Reservoir
• Killington Reservoir
• Meadley Reservoir, by Flat Fell, Ennerdale, Cumbria
• Simpson Ground Reservoir, east of Newby Bridge
• Thirlmere
• Wet Sleddale Reservoir

  Derbyshire

• Codnor Reservoir
• Whaley Bridge Spillway
• Carsington Water
• Combs Reservoir
• Errwood Reservoir
• Fernilee Reservoir
• Foremark Reservoir
• Hurst Reservoir
• Linacre
• *Upper Linacre Reservoir
• *Middle Linacre Reservoir
• *Lower Linacre Reservoir
• Mossy Lea Reservoir
• Ogston Reservoir
• Staunton Harold Reservoir
• Upper Derwent Valley
• *Ladybower Reservoir
• *Derwent Reservoir with Birchinlee
• *Howden Reservoir Eastern half is in Sheffield
• Longdendale Chain of reservoirs
• *Arnfield Reservoir
• *Hollingworth Reservoir now drained and a nature reserve
• *Bottoms Reservoir
• *Valehouse Reservoir
• *Rhodeswood Reservoir
• *Torside Reservoir
• *Woodhead Reservoir
• Swineshaw Reservoir
• Upper Swineshaw Reservoir
• Toddbrook Reservoir
• Loscoe Dam

  Devon

• Avon Dam Reservoir
• Burrator Reservoir
• Challacombe/Bray Reservoir
• Butter Brook Reservoir
• Darracott Reservoir
• Fernworthy Reservoir
• Gammaton Reservoirs
• Holywell Reservoir
• Jennetts Reservoir
• Kennick Reservoir
• Lower Tamar Lake
• Melbury Reservoir
• Meldon Reservoir
• River Tavy Reservoir
• Roadford Lake
• Slade Reservoir
• Squabmoor reservoir
• Tottiford Reservoir
• Trenchford Reservoir
• Upper Tamar Lake
• Venford Reservoir
• Wheal Jewell Reservoir
• Wistlandpound Reservoir

  East Sussex

• Arlington Reservoir
• Darwell Reservoir
• Powdermill Reservoir

  Essex

• Abberton Reservoir
• Ardleigh Reservoir
• Hanningfield Reservoir

  Gloucestershire

• Dowdeswell Reservoir

  Greater Manchester

• Bolton:
• *Belmont Reservoir
• *Bryan Hey Reservoir
• *Dean Mills Reservoir
• *High Rid Reservoir
• *Lower Rivington Reservoir
• *Rumworth Lodge Reservoir
• *Upper Rivington Reservoir
• Bury
• *Lowercroft Reservoir
• *Manchester, Bolton and Bury Reservoir
• Manchester:
• *Gorton Reservoirs
• *Heaton Park Reservoir
• Oldham:
• *Ashworth Moor Reservoir
• *Besom Hill Reservoir
• *Black Moss Reservoir
• *Brownhouse Wham Reservoir
• *Brushes Clough Reservoir
• *Castleshaw Reservoir
• *Chew_Reservoir
• *Crook Gate Reservoir
• *Diggle Reservoir
• *Dovestones Reservoir
• *Dowry Reservoir
• *Greenfield Reservoir
• *Hamer Pasture Reservoir
• *New Years Bridge Reservoir
• *Readycon Dean Reservoir
• *Strinesdale Reservoir
• *Yeoman Hey Reservoir
• Rochdale:
• *Ashworth Moor Reservoir
• *Blackstone Edge Reservoir
• *Chelburn Reservoir
• *Greenbooth Reservoir
• *Hanging Lees Reservoir
• *Hollingworth Lake
• *Kitcliffe Reservoir
• *Light Hazzles Reservoir
• *Lower Chelburn Reservoir
• *Naden Reservoirs
• *Norman Hill Reservoir
• *Ogden Reservoir
• *Piethorne Reservoir
• *Rooden Reservoir
• *Watergrove Reservoir
• Tameside:
• *Audenshaw Reservoirs
• *Brushes Reservoir
• *Denton Reservoirs
• *Godley Reservoir
• *Higher Swineshaw Reservoir
• *Lower Swineshaw Reservoir
• *Swineshaw Reservoirs
• *Walkerwood Reservoir
• Wigan:
• *Worthington Lakes

  Hertfordshire

• Tring Reservoirs

  Kent

• Bough Beech
• Bewl Water

  Lancashire

• Anglezarke Reservoir
• Belmont Reservoir
• Black Moss Reservoirs
• Calf Hey Reservoir
• Cowm Reservoir
• Delph Reservoir
• Dingle Reservoir
• Foulridge Reservoir
• High Bullough Reservoir
• Holden Wood Reservoir
• Jumbles Reservoir
• Lower Rivington Reservoir
• Lower Roddlesworth Reservoir
• Lower Ogden Reservoir
• Rake Brook Reservoir
• Spring Mill Reservoir
• Springs Reservoir
• Stocks Reservoir
• Turton and Entwistle Reservoir
• Upper Ogden Reservoir
• Upper Rivington Reservoir
• Upper Roddlesworth Reservoir
• Walves Reservoir
• Ward's Reservoir
• Watersheddles Reservoir
• Wayoh Reservoir
• Yarrow Reservoir

  Leicestershire

• Blackbrook Reservoir
• Eyebrook Reservoir
• Cropston Reservoir
• Knipton Reservoir
• Nanpantan Reservoir
• Saddington Reservoir
• Staunton Harold Reservoir
• Swithland Reservoir
• Thornton Reservoir

  Lincolnshire

• Covenham Reservoir
• Denton Reservoir
• Knipton Reservoir

  London

• Brent Reservoir
• Grand Junction Reservoir
• Stain Hill Reservoirs
• Stoke Newington West Reservoir
• Sunnyside Reservoir

• King George's Reservoir, London Borough of Enfield
• William Girling Reservoir, London Borough of Enfield
• Banbury Reservoir, London Borough of Waltham Forest
• Lockwood Reservoir, London Borough of Waltham Forest
• High Maynard Reservoir, London Borough of Waltham Forest
• Low Maynard Reservoir, London Borough of Waltham Forest
• Walthamstow Reservoirs, London Borough of Waltham Forest, five linked numbered reservoirs
• East Warwick Reservoir, London Borough of Waltham Forest
• West Warwick Reservoir, London Borough of Waltham Forest

  Northamptonshire

• Boddington Reservoir, a canal supply reservoir between Byfield and Upper Boddington
• Cransley Reservoir
• Daventry Reservoir in Daventry Country Park
• Drayton Reservoir
• Hollowell reservoir
• Naseby Reservoir
• Pitsford Water
• Ravensthorpe Reservoir
• Stanford Reservoir, between Stanford-on-Avon and South Kilworth
• Sulby and Welford Reservoirs
• Sywell Reservoir
• Thorpe Malsor Reservoir

  Northumberland

• Bakethin Reservoir
• Catcleugh Reservoir
• Colt Crag Reservoir
• Fontburn
• Hallington Reservoirs
• Little Swinburne Reservoir
• Kielder Water
• Whittle Dene

  North Yorkshire

• Angram Reservoir
• Upper and Lower Barden Reservoirs
• Beaver Dyke Reservoirs
• Chelker Reservoir
• Cod Beck Reservoir
• Elslack Reservoir
• Embsay Reservoir
• Fewston Reservoir
• Gouthwaite Reservoir
• Grimwith Reservoir
• Laneshaw Reservoir
• Leighton Reservoir
• Lindley Wood Reservoir
• Lockwood Beck Reservoir
• Lumley Moor Reservoir
• March Ghyll Reservoir
• Mossy Moor Reservoir
• Oulston Reservoir
• Roundhill Reservoir
• Scaling Dam Reservoir
• Scar House Reservoir
• Scargill Reservoir
• Swinsty Reservoir
• Ten Acre Reservoir
• Thornton Steward Reservoir
• Thruscross Reservoir
• Winterburn Reservoir

  Oxfordshire

• Clattercote Reservoir
• Farmoor Reservoir,

  Rutland

• Rutland Water

  Shropshire

• Chelmarsh Reservoir
• Knighton Reservoir

  Somerset

• Ashford Reservoir
• Barrow Gurney Tanks
• Blagdon Lake
• Chard Reservoir
• Cheddar Reservoir
• Chew Valley Lake
• Clatworthy Reservoir
• Durleigh reservoir
• Hawkridge Reservoir
• Leigh Reservoir
• Litton Reservoirs
• Luxhay Reservoir
• Nutscale Reservoir
• Sutton Bingham Reservoir
• Wimbleball Lake

  South Yorkshire

• Agden Reservoir
• Broadstone Reservoir
• Broomhead Reservoir
• Dale Dyke Reservoir
• Damflask Reservoir
• Elsecar Reservoir
• Howden Reservoir Western half is in Derbyshire
• Ingbirchworth Reservoir
• Langsett Reservoir
• Midhope Reservoir
• More Hall Reservoir
• Pebley Reservoir
• Redmires Reservoirs
• Rivelin Dams
• Royd Moor Reservoir
• Scout Dyke Reservoir
• Snailsden Reservoir
• Strines Reservoir
• Underbank Reservoir
• Weecher Reservoir
• Wharncliffe Reservoir
• Windleden Reservoirs
• Winscar Reservoir
• Worsbrough Reservoir

  Staffordshire

• Bathpool Park Lake
• Belvide Reservoir
• Betley Hall Reservoir
• Blithfield Reservoir
• Bromley Mill Pool
• Brookleys Lake
• Canwell Estate Reservoir
• Chasewater
• Gailey Reservoir
• Gap Pool
• Hales Hall Pool
• Hatherton Reservoir
• Hanch Reservoir
• Holly Bush Lake
• Knypersley Reservoir
• Minster Pool
• Rudyard Lake
• Stowe Pool
• Swinfen Lake
• Tixall Park Pool
• Trentham Gardens Lake
• Tittesworth Reservoir

  Surrey

• Bessborough Reservoir
• Island Barn Reservoir
• King George VI Reservoir
• Knight Reservoir
• Molesey Reservoirs
• Queen Elizabeth II Reservoir
• Queen Mary Reservoir
• Queen Mother Reservoir
• Staines Reservoirs
• Wraysbury Reservoir

  Suffolk

• Alton Water

  Warwickshire

• Draycote Water
• Oldbury Reservoir
• Packington Lakes - support for the Grand Union Canal
• Shustoke Reservoirs
• Wormleighton Reservoir

  West Midlands

• Bartley Reservoir
• Brookvale Park Lake
• Edgbaston Reservoir
• Frankley Reservoir
• Lifford Reservoir
• Netherton Reservoir, Dudley
• Olton Reservoir, Solihull
• Perry Barr Reservoir
• Witton Lakes
• see also Elan Valley Reservoirs which were built by, and supply, Birmingham.

  West Sussex

• Ardingly Reservoir
• Weir Wood Reservoir

  West Yorkshire

• Ardsley Reservoir
• Baitings Reservoir
• Bilberry Reservoir
• Blackmoorfoot Reservoir
• Black Moss Reservoir
• Blakeley Reservoir
• Booth Dean Upper Reservoir
• Booth Dean Lower Reservoir
• Booth Wood Reservoir
• Boshaw Whams Reservoir
• Brownhill Reservoir
• Butterley Reservoir
• Chelker Reservoir
• Cupwith Reservoir
• Dean Head Upper Reservoir
• Dean Head Lower Reservoir
• Dean Head Reservoir
• Deer Hill Reservoir
• Digley Reservoir
• Doe Park Reservoir
• Eccup Reservoir
• Eldwick Reservoir
• Elslack Reservoir
• Gorple Lower Reservoir
• Gorple Upper Reservoir
• Graincliffe Reservoir
• Green Withens Reservoir
• Hewenden Reservoir
• Holme Styes Reservoir
• Keighley Moor Reservoir
• Leeming Reservoir
• Leeshaw Reservoir
• Lower Laithe Reservoir
• March Ghyll Reservoir
• March Hey Reservoir
• Mixenden Reservoir
• Ogden Reservoir
• Panorama Reservoir
• Ponden Reservoir
• Ramsden Reservoir
• Redbrook Reservoir
• Reva Reservoir
• Riding Wood Reservoir
• Ringstone Edge Reservoir
• Ryburn Reservoir
• Scammonden Reservoir
• Silsden Reservoir
• Stubden Reservoir
• Sunnydale Reservoir
• Swellands Reservoir
• Thornton Moor Reservoir
• Walshaw Dean Reservoirs
• Warland Reservoir
• Warley Moor Reservoir
• Weecher Reservoir
• Wessenden Reservoir
• Wessenden Head Reservoir
• Widdop Reservoir
• Yateholme Reservoir

  Wiltshire

• Wilton Water header reservoir for the Kennet and Avon Canal

  Worcestershire

• Bittell Reservoirs
• Tardebigge Reservoir

  Northern Ireland

Co. Down

• Silent Valley Reservoir
• Spelga Reservoir

  Scotland

[City of Aberdeen]

• Braeside Reservoir
• Cattofield Reservoir
• Mannofield Reservoir
• Slopefield Reservoir
• Smithfield Reservoir

  [Aberdeenshire]

• Bluehills Reservoir
• Clochandighter Reservoir
• Garlogie Dam
• Inchgarth Reservoir - Cults
• Loch of Aboyne
• Loch Saugh
• Silver Dam aka Culter Compensation Dam

  Angus">Angus, Scotland">Angus

• Backwater Reservoir
• Brewlands Reservoir
• Crombie Reservoir
• Den of Ogil
• Glenogil
• Kinnaird Lake
• Ledcrieff Loch
• Linrathen
• Linrathen Clear Water Storage
• Loch Auchintaple or Auchintaple Loch
• Loch Lee
• Loch Shandra
• Long Loch
• Monikie Clear Water Basin
• Monikie North Pond
• Monikie South Pond
• Piperdam Loch

  [Argyll and Bute]

• Allt na Lairige - Glen Fyne
• Ardlussa Fishing Loch - Isle of Jura
• Asgog Loch - Tighnabruaich
• Aucha Lochy - Campbeltown
• Auchengaich Reservoir - Glen Fruin
• Beochlich - 9 km NW of Inveraray
• Bishop's Glen Reservoir - Dunoon
• Blackmill Loch - Minard
• Cam Loch - North Knapdale
• Craignafeich Reservoirs - Tighnabruaich
• Crarae Reservoir - Minard
• Crosshill Loch - Campbeltown
• Cruachan Reservoir - Loch Awe
• Daill Loch - North Knapdale
• Dhu Loch - Bute
• Feorlin - Minard
• Gleann Dubh - Barcaldine
• Gleann Loch - North Knapdale
• Helensburgh No. 1 Reservoir - Helensburgh
• Helensburgh No. 2 Reservoir - Helensburgh
• Kilduskland Reservoir - Ardrishaig
• Kirk Dam - Bute
• Knockruan Loch - Campbeltown
• Leorin Loch - Port Ellen, Islay
• Lindowan Reservoir - Kilcreggan
• Loch A' Bharain - North Knapdale
• Loch A' Chaorainn - South Knapdale
• Loch Allan - Port Askaig, Islay
• Loch a'Mhuillin - North Knapdale
• Loch an Add - North Knapdale
• Loch an Droighinn - Kilchrenan
• Loch an Sgoltaire - Isle of Colonsay
• Loch an Torr - Dervaig, Isle of Mull
• Loch Ascog - Isle of Bute
• Loch Assapol - Bunessan, Isle of Mull
• Loch Awe - part of the Awe hydroelectric scheme
• Loch Ba - Gruline, Isle of Mull
• Loch Bearnoch - Lochdon, Isle of Mull
• Loch Beinn Uraraidh - Port Ellen, Islay
• Loch Cam - Bridgend, Isle of Islay
• Loch Chaorunn - South Knapdale
• Loch Ciaran - Clachan, North Kintyre
• Loch Clachaig - North Knapdale
• Loch Eck - Cowal
• Loch Fad - Bute
• Loch Finlas - 4 km SW Luss
• Loch Gearach - Port Charlotte, Islay
• Loch Glashan - Lochgair, Mid-Argyll
• Loch Gleann - Oban
• Loch Iarnan - Port Ellen, Islay
• Loch Leacann - Furnace
• Loch Lebdgei - North Knapdale
• Loch Lebgei - North Knapdale
• Loch Na Bric - North Knapdale
• Loch na Creige Crainde - North Knapdale
• Loch Na Faoilinn - North Knapdale
• Loch Na Sreinge - 9 km NE of Kilmelford
• Loch Nam Ban - Port Askaig, Islay
• Loch Nam Breac Buidhe - North Knapdale
• Loch Nan Torran - South Knapdale
• Loch Righeachan - Inveraray
• Loch Skerrols - Bridgend, Isle of Islay
• Loch Sloy - 6 km N of Arrochar
• Loch Tarsan - Glen Lean, Cowal
• Loch Tralaig - Kilmelford
• Loch Turamin - Isle of Colonsay
• Loch Uigeadail - Port Ellen, Islay
• Lochan A' Ghurrabain - Tobermory, Isle of Mull
• Lochan Duin - North Knapdale
• Lochan Ghlas - Garelochhead
• Lochan Gleann Astaile - Isle of Jura
• Lochan Lasgainn Mor - Kilmelford
• Lower Glen Shira - 12 km NE of Inveraray
• Luachrach Loch - Oban
• Main Glen Shira - 13 km NE of Inveraray
• Mishnish Lochs - Tobermory, Isle of Mull
• Nant Reservoir - Kilchrenan
• Oude Reservoir - Kilmelford
• Powder Mill Dam - Tighnabruaich
• Sholum Lochs - Port Ellen, Islay
• Still Loch - Ardrishaig
• Strathduie Water - Campbeltown

  [Clackmannanshire]

• Gartmorn Dam

  [Dumfries and Galloway]

• Carsfad Loch
• Clatteringshaws Loch
• Glenkiln Reservoir
• Kettleton Reservoir
• Black Esk Dam
• Winterhope Reservoir

  [City of Dundee]

• Clatto Reservoir

  [East Ayrshire]

• Afton Reservoir
• Corsehouse Reservoir
• Craigendunton Reservoir
• Glenbuck Loch
• Loch Finlas

  [East Dunbartonshire]

• Bankell Reservoir - supplies Milngavie water treatment works
• Craigmaddie Reservoir - supplies Milngavie water treatment works
• Mugdock Reservoir - supplies Milngavie water treatment works

  [East Lothian]

• Lammerloch
• Stobshiel Reservoir
• Whiteadder Reservoir

  [East Renfrewshire]

• Balgray Reservoir
• Littleton Reservoir
• Ryat Linn Reservoir
• Waulkmill Glen Reservoir
• Walton Dam
• Glanderston Dam
• Snypes Dam
• Kirkton Dam
• Harelaw Reservoir, Fereneze Golf Course
• Harelaw Reservoir, Eaglesham Moor
• Rouken Glen Pond
• Craighall Reservoir
• Commore Dam
• White Loch
• Black Loch
• Brother Loch
• Little Loch
• Pilmuir Reservoir
• Loch Craig
• Bennan Loch
• Corsehouse Reservoir
• Long Loch
• Loch Goin
• Dunwan Loch
• High Dam
• Picketlaw Reservoir
• Caplaw Dam
• Netherplace Reservoir
• Glenburn Reservoir

  [City of Edinburgh]

• Clubbiedean Reservoir
• Harlaw Reservoir
• Threipmuir Reservoir
• Torduff Reservoir
• Bonaly Reservoir

  [Falkirk]

• Faughlin Reservoir
• Millhall Reservoir

  [Fife]

• Ballo Reservoir
• Clatto Reservoir
• Cameron Reservoir
• Castlehill Reservoir
• Drumain Reservoir
• Holl Reservoir
• Harperleas Reservoir
• Stenhouse Loch
• Carriston Reservoir
• Donald Rose Reservoir
• Carlhurlie Reservoir

  [City of Glasgow]

• Hogganfield Loch

  Highland">Highland (council area)">Highland

• Blackwater Reservoir, near Kinlochleven
• Clunas Reservoir
• Loch Benevean
• Loch Laggan and Loch Treig - both part of the Lochaber hydroelectric scheme
• Loch Monar - part of the Strathfarrar hydroelectric scheme
• Loch Quoich and Loch Garry - both part of the Glen Garry hydroelectric scheme
• Loch Loyne and Loch Cluanie - both part of the Glen Moriston hydroelectric scheme
• Loch Mullardoch - part of the Glen Affric hydroelectric scheme
• Loch Katrine
• Loch Glascarnoch

  [Inverclyde]

• Loch Thom
• Gryffe Reservoir

  [Midlothian]

• Edgelaw Reservoir
• Gladhouse Reservoir
• Glencorse Reservoir
• North Esk Reservoir
• Rosebery Reservoir
• Loganlea Reservoir

  [Moray]

• Glenlatterach Reservoir

  [North Ayrshire]

• Auldmuir Reservoir
• Barcraigs Reservoir
• Busbie Muir Reservoir
• Caaf Reservoir
• Camphill Reservoir
• Cuffhill Reservoir
• Glenburn Reservoir
• Kelly Reservoir
• Knockendon Reservoir
• Kirkleegreen Reservoir
• Mill Glen Reservoir
• Muirhead Reservoir
• Munnoch Reservoir
• Outerwards Reservoir
• Skelmorlie Lower Reservoir
• Skelmorlie Upper Reservoir

  [North Lanarkshire]

• Birkenburn
• Broadwood Loch
• Daer
• Dalmacoulter
• Forrestburn
• Glenhove No. 1
• Glenhove No. 2
• Hillend Loch
• Lilly Loch
• Roughrigg
• Strathclyde Park
• Townhead Reservoir
• West Corrie

  [Orkney]

• Wideford Hill Reservoir
• Stromness Waterworks

  [Perth and Kinross]

• Dunalastair Water
• Loch Tummel - part of the Tummel Valley hydroelectric scheme
• Loch Turret Reservoir and Glenturret Dam. Near Crieff
• Lower Glendevon Reservoir
• Upper Glendevon Reservoir

  [Renfrewshire]

• Rowbank Reservoir

  [Scottish Borders]

• Alemoor Loch
• Baddinsgill Reservoir
• Fruid Reservoir
• Megget Reservoir
• Talla Reservoir
• Westwater Reservoir

  [Shetland]

• Sandy Loch Reservoir

  [South Ayrshire]

• Bradan Service Reservoir
• Collenan
• Glendrissaigh
• Loch Bradan
• Loch Riecawr
• Loch Spallander
• Loch Spouts
• Penwhapple
• Raith

  [South Lanarkshire]

• Camps Reservoir
• Culter Waterhead Reservoir

  [Stirling]

• Cocksburn Reservoir
• Earlsburn Reservoir
• North Third Reservoir

  [West Dunbartonshire]

• Cochno Loch
• Jaw Reservoir
• Greenside Reservoir
• Carman Reservoir
• Kilmannan Reservoir
• Burncrooks Reservoir

  [West Lothian]

• Cobbinshaw Reservoir
• Eliburn Reservoir
• Harperrig Reservoir
• Lochcote Reservoir

  [Western Isles]

• Loch Mor an Stairr - Isle of Lewis
• Roghadal Reservoir - Isle of Harris

  Wales

[Anglesey] (Ynys Mon)

• Llyn Alaw - Water supply to much of north Anglesey
• Llyn Cefni - Water supply to central Anglesey

  [Cardiff]

• Llanishen Reservoir - Water supply to Cardiff
• Lisvane Reservoir - Water Supply to Cardiff

  [Carmarthenshire]

• Upper and Cwm Lliedi Reservoirs
• Llyn Brianne
• Llyn y Fan Fach
• Usk Reservoir

  [Ceredigion]

• Dinas Reservoir
• Teifi Pools
• Llyn Teifi
• Nant y Moch Reservoir

  [Conwy]

• Llyn Bodgynydd - supply for the Pandora lead mine
• Llyn Brenig - part of Dee Regulation system - also in Denbighshire
• Llyn Coedty - Water supply for Dolgarrog Hydroelectric station
• Llyn Conwy - water supply for Llanrwst and Betws-y-Coed
• Llyn Cowlyd - water supply for Conwy and Colwyn Bay,Water supply for Dolgarrog Hydroelectric station
• Llyn Crafnant - water supply for Llanrwst
• Llyn Dulyn - water supply for Llandudno
• Llyn Melynllyn - water supply for Llandudno
• Llyn Parc - supply for the Aberllyn mine
• Llyn Elsi - water supply for Betws-y-Coed

  [Denbighshire]

• Aled Isaf Reservoir
• Alwen Reservoir
• Cae Llwyd Reservoir
• Llyn Aled
• Llyn Alwen
• Llyn Brenig - part of the River Dee regulation system
• Llyn Celyn - part of the River Dee regulation system. Its construction caused local outrage with the flooding of a Welsh village to enable water to be supplied to England
• Pendinas Reservoir
• Llyn Tegid
• Nant-y-Ffrith Reservoir
• Ty Mawr Reservoir

  [Gwynedd]

• Llyn Anafon - water supply for Llanfairfechan, Dwygyfylchi and Penmaenmawr
• Llyn Arenig Fach
• Llyn Arenig Fawr - water supply for Bala town
• Llynnau Barlwyd - supply to Llechwedd slate quarry
• Llyn Bodlyn - water supply to Barmouth. Also supports the rare Arctic char
• Llyn Bowydd - supply to the Blaenau Ffestiniog slate quarries
• Llyn Cwm Corsiog - supply for Rhosydd slate quarry
• Llyn Cwellyn - water supply to Bangor and parts of south Anglesey
• Marchlyn Mawr - header reservoir for the Dinorwig power station hydroelectric system.
• Llyn Peris
• Llyn Padarn - part of the Dinorwig hydroelectric system
• Llyn Stwlan - built for the hydroelectric Ffestiniog Power Station
• Llyn Trawsfynydd - built for the Maentwrog Hydroelectric Power Station

  [Merthyr Tydfil]

• Llwyn-on Reservoir
• Pontsticill Reservoir, including Pentwyn Reservoir

  [Neath Port Talbot]

• Eglwys Nunydd - water supply to Corus Group steel-works at Port Talbot

  [Pembrokeshire]

• Bosherston lakes - amenity reservoir
• Llys-y-Frân Reservoir
• Rosebush Reservoir

  [Powys]

• Taff Fawr Reservoirs- A chain of three reservoirs supplying the Rhondda and Taff valley and Cardiff with water
• *Beacons Reservoir
• *Cantref Reservoir
• * also see Llwyn-on Reservoir in Merthyr Tydfil
• Taff Fechan Reservoirs - a chain of four reservoirs also supplying the Taff valley and Cardiff with water
• *Upper Neaudd Reservoir
• *Lower Neuadd Reservoir
• *Doly y gaer Reservoir
• *Pontsticill Reservoir
• Elan Valley Reservoirs - a group of reservoirs supplying Birmingham and parts of the West Midlands conurbation with drinking water
• *Claerwen Reservoir
• *Craig-goch Reservoir
• *Penygarreg Reservoir
• *Garreg-ddu Reservoir
• *Caban-coch Reservoir
• Llyn Efyrnwy - supplies water to the Liverpool area
• Talybont Reservoir
• Ystradfellte Reservoir
• Llyn Clywedog

  [Swansea]

• Cray reservoir
• Swansea Barrage

  [Torfaen]

• Llandegfedd Reservoir