Rank Name Country County Maximum volume m3 [ 1] Planning Completion 26 Abberton England Essex TL9810018300 51°49′41″N 0°52′24″E / 51.828181°N 0.873431°E / 51.828181; 0.873431 (Abberton Reservoir )
39,000,000 1935[ i] 1939 175 Agden England South Yorkshire SK2610092300 53°25′37″N 1°36′31″W / 53.426850°N 1.6086803°W / 53.426850; -1.6086803 (Agden Reservoir )
2,859,000 1864 1869 152 Allerton Newton Fairburn England West Yorkshire SE4500027200 53°44′21″N 1°19′09″W / 53.739250°N 1.3192470°W / 53.739250; -1.3192470 (Allerton Newton Fairburn )
3,347,500 NA NA 229 Allt na Lairige Scotland Argyll and Bute NN2530017400 56°19′00″N 4°49′34″W / 56.316700°N 4.8262144°W / 56.316700; -4.8262144 (Allt na Lairige )
1,838,000 1943[ ii] 1956[ iii] 83 Alton Water England Suffolk TM1620035700 51°58′40″N 1°08′48″E / 51.977682°N 1.1465962°E / 51.977682; 1.1465962 (Alton Water )
9,100,000 1974[ iv] 1986 60 Alwen Reservoir Wales Conwy SH9550053000 53°03′50″N 3°33′39″W / 53.063990°N 3.5609018°W / 53.063990; -3.5609018 (Alwen Reservoir )
14,754,000 1909 1921 135 Anglezarke England Lancashire SD6170016000 53°38′21″N 2°34′51″W / 53.639105°N 2.5807524°W / 53.639105; -2.5807524 (Anglezarke Reservoir )
4,044,000 1850 1857 129 Angram England North Yorkshire SE0400076000 54°10′47″N 1°56′25″W / 54.179767°N 1.9402122°W / 54.179767; -1.9402122 (Angram Reservoir )
4,737,000 1904 1918 119 Ardingly England West Sussex TQ3350028800 51°02′35″N 0°05′49″W / 51.043051°N 0.097062417°W / 51.043051; -0.097062417 (Ardingly Reservoir )
5,206,000 1974[ v] 1979[ v] 210 Ardleigh England Essex TM0340028200 51°54′55″N 0°57′22″E / 51.915170°N 0.95606328°E / 51.915170; 0.95606328 (Ardleigh Reservoir )
2,109,000 1964 1979 143 Arlington England East Sussex TQ5335207419 50°50′46″N 0°10′37″E / 50.845975°N 0.17691709°E / 50.845975; 0.17691709 (Arlington Reservoir )
3,545,800 1969 1971 185 Audenshaw No.1 England Greater Manchester SJ9170096700 53°28′01″N 2°07′35″W / 53.466973°N 2.1264940°W / 53.466973; -2.1264940 (Audenshaw No.1 )
2,590,000 1875 1882 234 Audenshaw No.2 England Greater Manchester SJ9140096200 53°27′45″N 2°07′52″W / 53.462474°N 2.1309991°W / 53.462474; -2.1309991 (Audenshaw No.2 )
1,745,000 1875 1882 183 Audenshaw No.3 England Greater Manchester SJ9110096700 53°28′01″N 2°08′08″W / 53.466963°N 2.1355320°W / 53.466963; -2.1355320 (Audenshaw No.3 )
2,680,000 1877 1882 201 Baddinsgill [ v] Scotland Scottish Borders NT1286455787 55°47′15″N 3°23′28″W / 55.787507°N 3.3910944°W / 55.787507; -3.3910944 (Baddinsgill Reservoir )
2,250,000 1926 1828 144 Baitings England West Yorkshire SE0100018900 53°40′00″N 1°59′11″W / 53.666580°N 1.9863413°W / 53.666580; -1.9863413 (Baitings Reservoir )
3,523,000 1929[ v] 1956 168 Bakethin England Northumberland NY6430091300 55°12′53″N 2°33′45″W / 55.214639°N 2.5626151°W / 55.214639; -2.5626151 (Bakethin Reservoir )
2,960,000 1971[ vi] 1981 50 Balderhead England County Durham NY9280018400 54°33′39″N 2°06′46″W / 54.560782°N 2.1128527°W / 54.560782; -2.1128527 (Balderhead Reservoir )
19,618,000 1959[ i] 1965 178 Banbury England Greater London TQ3620091400 51°36′18″N 0°02′05″W / 51.604974°N 0.034668699°W / 51.604974; -0.034668699 (Banbury Reservoir )
2,779,000 1897[ iv] 1903 166 Banbury FSA England Greater London TQ3620091400 51°36′18″N 0°02′05″W / 51.604974°N 0.034668699°W / 51.604974; -0.034668699 (Banbury FSA )
3,040,000 2001 2012 202 Barden Lower England North Yorkshire SE0350056700 54°00′23″N 1°56′53″W / 54.006312°N 1.9480887°W / 54.006312; -1.9480887 (Barden Lower Reservoir )
2,240,000 1854 1873 209 Barden Upper England North Yorkshire SE0120057800 54°00′58″N 1°58′59″W / 54.016208°N 1.9831770°W / 54.016208; -1.9831770 (Barden Upper Reservoir )
2,112,000 1854 1873 261 Barnacre North England Lancashire SD5260047800 53°55′27″N 2°43′24″W / 53.924153°N 2.7232767°W / 53.924153; -2.7232767 (Barnacre North )
344,000 1861[ iv] 1878 264 Barnacre South England Lancashire SD5260047600 53°55′20″N 2°43′24″W / 53.922355°N 2.7232456°W / 53.922355; -2.7232456 (Barnacre South )
248,000 1861[ iv] 1878 268 Barrow 1 England Somerset ST5360067200 51°24′07″N 2°40′06″W / 51.401921°N 2.6684067°W / 51.401921; -2.6684067 (Barrow 1 )
157,000 1846[ iv] 1850 265 Barrow 2 England Somerset ST5390067500 51°24′17″N 2°39′51″W / 51.404643°N 2.6641335°W / 51.404643; -2.6641335 (Barrow 2 )
245,000 1846[ iv] 1850 208 Barrow 3 England Somerset ST5430068000 51°24′33″N 2°39′30″W / 51.409171°N 2.6584480°W / 51.409171; -2.6584480 (Barrow 3 )
2,160,000 1846[ iv] 1850 191 Bartley England West Midlands County SP0020081200 52°25′44″N 1°59′55″W / 52.428782°N 1.9984853°W / 52.428782; -1.9984853 (Bartley Reservoir )
2,400,000 1925 1930 267 Beacons Reservoir Wales Powys SN9870018580 51°51′24″N 3°28′20″W / 51.856583°N 3.4722935°W / 51.856583; -3.4722935 (Beacons Reservoir )
160,000 1883[ iv] 1897 96 Beckingham FSA England Nottinghamshire SK7950090500 53°24′19″N 0°48′20″W / 53.405341°N 0.80563022°W / 53.405341; -0.80563022 (Beckingham FSA )
7,000,000 1960 1960 224 Belmont England Blackburn with Darwen SD6730016400 53°38′35″N 2°29′46″W / 53.643081°N 2.4960998°W / 53.643081; -2.4960998 (Belmont Reservoir )
1,886,000 1824 1826 206 Belvide England Staffordshire SJ8650010200 52°41′22″N 2°12′04″W / 52.689316°N 2.2011613°W / 52.689316; -2.2011613 (Belvide Reservoir )
2,196,000 1825[ i] 1833 239 Ben Crom Northern Ireland County Down SB4015582002 54°10′04″N 5°58′57″W / 54.167845°N 5.9825162°W / 54.167845; -5.9825162 (Ben Crom Reservoir )
1,700,000 1945 1957 32 Bewl Bridge England East Sussex TQ6776832663 51°04′08″N 0°23′35″E / 51.068782°N 0.39313386°E / 51.068782; 0.39313386 (Bewl Bridge Reservoir )
31,400,000 1967[ vi] 1975 195 Blackbrook England Leicestershire SK4580017500 52°45′11″N 1°19′22″W / 52.753180°N 1.3228607°W / 52.753180; -1.3228607 (Blackbrook Reservoir )
2,300,000 1901 1906 160 Blackmoorfoot England West Yorkshire SE0990013000 53°36′48″N 1°51′07″W / 53.613459°N 1.8518301°W / 53.613459; -1.8518301 (Blackmoorfoot )
3,205,000 1869 1876 212 Blackton England County Durham NY9440018600 54°33′45″N 2°05′17″W / 54.562600°N 2.0881146°W / 54.562600; -2.0881146 (Blackton Reservoir )
2,105,000 1876[ i] 1896 5 Blackwater Scotland Highland NN2475160292 56°42′05″N 4°51′50″W / 56.701359°N 4.8639740°W / 56.701359; -4.8639740 (Blackwater Reservoir )
214,977,000 1904 1909 88 Blagdon (Bristol) England Somerset ST5100060000 51°20′13″N 2°42′17″W / 51.336967°N 2.7047849°W / 51.336967; -2.7047849 (Blagdon Lake )
8,260,000 1888[ iv] 1904 52 Blithfield England Staffordshire SK0600023500 52°48′32″N 1°54′45″W / 52.809016°N 1.9124313°W / 52.809016; -1.9124313 (Blithfield Reservoir )
18,200,000 1892 1953 248 Bosley England Cheshire SJ9220065900 53°11′24″N 2°07′05″W / 53.190130°N 2.1181929°W / 53.190130; -2.1181929 (Bosley Reservoir )
1,224,000 1826 1931 196 Bottoms (Longdendale) England Derbyshire SK0230097000 53°28′11″N 1°58′01″W / 53.469732°N 1.9668196°W / 53.469732; -1.9668196 (Bottoms Reservoir (Derbyshire) )
2,300,000 1848 1877 78 Bough Beech England Kent TQ4940047700 51°12′32″N 0°08′15″E / 51.208972°N 0.13741063°E / 51.208972; 0.13741063 (Bough Beech Reservoir )
10,018,000 1965[ vi] 1968 220 Branston Island England Lincolnshire TF1000071000 53°13′29″N 0°21′14″W / 53.224667°N 0.35378615°W / 53.224667; -0.35378615 (Branston Island )
2,000,000 NA NA 246 Brent England Greater London TQ2160087100 51°34′11″N 0°14′49″W / 51.569668°N 0.24686808°W / 51.569668; -0.24686808 (Brent Reservoir )
1,632,330 1819 1835 126 Broomhead England South Yorkshire SK2690095900 53°27′33″N 1°35′47″W / 53.459168°N 1.5963348°W / 53.459168; -1.5963348 (Broomhead Reservoir )
4,937,282 1867 1929 69 Brotherton Little Marsh to Birkin Holme Washland England North Yorkshire SE5210025300 53°43′17″N 1°12′43″W / 53.721515°N 1.2119357°W / 53.721515; -1.2119357 (Brotherton Little Marsh to Birkin Holme Washland )
11,320,000 NA NA 102 Burnhope England County Durham NY8470039000 54°44′45″N 2°14′21″W / 54.745724°N 2.2391942°W / 54.745724; -2.2391942 (Burnhope Reservoir )
6,438,182 1931 1937 132 Burrator [ v] England Devon SX5568768562 50°29′57″N 4°02′10″W / 50.499032°N 4.0361770°W / 50.499032; -4.0361770 (Burrator Reservoir )
4,464,000 1891 1898 232 Butterley England West Yorkshire SE0470010500 53°35′28″N 1°55′50″W / 53.591059°N 1.9304674°W / 53.591059; -1.9304674 (Butterley Reservoir (Derbyshire) )
1,773,000 1789 1794 28 Caban Coch Wales Powys SN9160063200 52°15′23″N 3°35′22″W / 52.256256°N 3.5895197°W / 52.256256; -3.5895197 (Caban Coch )
36,865,000 1892[ iv] 1904 218 Caldecott Lake England Buckinghamshire SP8990035800 52°00′48″N 0°41′29″W / 52.013356°N 0.69150143°W / 52.013356; -0.69150143 (Caldecott Lake )
2,014,000 1967 1972 269 Cantref Reservoir Wales Powys SN9938015840 51°49′55″N 3°27′42″W / 51.832079°N 3.4616252°W / 51.832079; -3.4616252 (Cantref Reservoir )
145,000 1884[ iv] 1892 29 Carsington England Derbyshire SK2480051400 53°03′33″N 1°37′53″W / 53.059279°N 1.6314139°W / 53.059279; -1.6314139 (Carsington Water )
36,000,000 1973[ vi] 1992 75 Catcleugh England Northumberland NT7470003100 55°19′17″N 2°24′01″W / 55.321313°N 2.4002361°W / 55.321313; -2.4002361 (Catcleugh Reservoir )
10,500,000 1888 1905 240 Catterall Flood Storage England Lancashire SD4680041300 53°51′55″N 2°48′38″W / 53.865173°N 2.8104563°W / 53.865173; -2.8104563 (Catterall Flood Storage )
1,700,000 NA 1982 214 Cavendish Dock England Cumbria SD2120068300 54°06′16″N 3°12′24″W / 54.104527°N 3.2066514°W / 54.104527; -3.2066514 (Cavendish Dock )
2,053,000 1863 1879 63 Cawood Ings Wistow Lordship England North Yorkshire SE6050036000 53°49′00″N 1°04′57″W / 53.816769°N 1.0825621°W / 53.816769; -1.0825621 (Cawood Ings Wistow Lordship )
13,500,000 NA NA 142 Chasewater England Staffordshire SK0360007600 52°39′58″N 1°56′54″W / 52.666103°N 1.9482042°W / 52.666103; -1.9482042 (Chasewater )
3,691,000 1794 1797 108 Cheddar England Somerset ST4410053700 51°16′47″N 2°48′10″W / 51.279686°N 2.8028357°W / 51.279686; -2.8028357 (Cheddar Reservoir )
6,140,000 1933 1938 270 Chelker England North Yorkshire SE0564051600 53°57′38″N 1°54′56″W / 53.960456°N 1.9155302°W / 53.960456; -1.9155302 (Chelker Reservoir )
95,000 NA 1866 164 Chelmarsh England Shropshire SO7340087500 52°29′05″N 2°23′35″W / 52.484765°N 2.3931329°W / 52.484765; -2.3931329 (Chelmarsh Reservoir )
3,063,320 1960 1963 273 Chew Magna England Somerset ST5660063200 51°21′58″N 2°37′29″W / 51.366195°N 2.6247933°W / 51.366195; -2.6247933 (Chew Magna Reservoir )
43,000 1850 1850 47 Chew Valley Lake England Somerset ST5700060000 51°20′15″N 2°37′07″W / 51.337453°N 2.6186602°W / 51.337453; -2.6186602 (Chew Valley Lake )
20,457,000 1939[ vi] 1956 111 Chrathaich Scotland Highland NH3640020700 57°14′52″N 4°42′47″W / 57.247645°N 4.7131125°W / 57.247645; -4.7131125 (Chrathaich Reservoir )
5,629,000 1928[ vi] 1955[ iii] 177 Church Wilne [ v] England Derbyshire SK4630032500 52°53′17″N 1°18′48″W / 52.887970°N 1.3133319°W / 52.887970; -1.3133319 (Church Wilne Reservoir )
2,790,000 NA 1972 22 Claerwen Wales Powys SN8550065100 52°16′20″N 3°40′46″W / 52.272093°N 3.6794917°W / 52.272093; -3.6794917 (Claerwen Reservoir )
48,686,000 1892[ vi] 1952 116 Clatworthy England Somerset ST0430031400 51°04′26″N 3°22′03″W / 51.073920°N 3.3673742°W / 51.073920; -3.3673742 (Clatworthy Reservoir )
5,364,000 1950 1958 197 Clifton Ings Washlands England North Yorkshire SE5870053100 53°58′14″N 1°06′24″W / 53.970648°N 1.1066274°W / 53.970648; -1.1066274 (Clifton Ings Washlands )
2,300,000 NA NA 34 Colliford Lake England Cornwall SX1790071000 50°30′37″N 4°34′11″W / 50.510401°N 4.5696538°W / 50.510401; -4.5696538 (Colliford Lake )
29,100,000 1976[ vi] 1983 127 Colt Crag England Northumberland NY9400078100 55°05′50″N 2°05′44″W / 55.097285°N 2.0955583°W / 55.097285; -2.0955583 (Colt Crag Reservoir )
4,855,000 1863 1884 73 Covenham England Lincolnshire TF3463596017 53°26′37″N 0°01′32″E / 53.443731°N 0.025611218°E / 53.443731; 0.025611218 (Covenham Reservoir )
10,900,000 1963 1978 24 Cow Green England Durham NY8120028900 54°39′17″N 2°17′34″W / 54.654841°N 2.2929079°W / 54.654841; -2.2929079 (Cow Green Reservoir )
40,914,000 1958[ iv] 1970 79 Craig Goch Wales Powys SN8960069800 52°18′55″N 3°37′15″W / 52.315169°N 3.6209719°W / 52.315169; -3.6209719 (Craig Goch Reservoir )
9,583,000 1892[ iv] 1904 136 Cray Wales Powys SN8850022000 51°53′07″N 3°37′17″W / 51.885373°N 3.6214431°W / 51.885373; -3.6214431 (Cray Reservoir )
4,027,000 1898[ v] 1906[ v] 186 Cropston England Leicestershire SK5470011000 52°41′38″N 1°11′32″W / 52.693928°N 1.1920904°W / 52.693928; -1.1920904 (Cropston Reservoir )
2,528,000 1865 1870 48 Crowlands Cowbit Washes England Lincolnshire TF2600016500 52°43′53″N 0°08′08″W / 52.731468°N 0.13545822°W / 52.731468; -0.13545822 (Crowlands Cowbit Washes )
20,000,000 NA NA 147 Crummock Water England Cumbria NY1510020800 54°34′31″N 3°18′54″W / 54.575257°N 3.3148907°W / 54.575257; -3.3148907 (Crummock Water )
3,400,000 NA NA 70 Curry Moor Flood Storage Area England Somerset ST3260027000 51°02′18″N 2°57′46″W / 51.038387°N 2.9626802°W / 51.038387; -2.9626802 (Curry Moor Flood Storage Area )
11,283,000 NA NA 44 Daer Scotland South Lanarkshire NS9757507812 55°21′13″N 3°37′01″W / 55.353611°N 3.6169925°W / 55.353611; -3.6169925 (Daer Reservoir )
22,494,000 1948 1956 205 Dale Dyke England South Yorkshire SK2430091700 53°25′18″N 1°38′09″W / 53.421543°N 1.6358144°W / 53.421543; -1.6358144 (Dale Dyke Reservoir )
2,210,000 1853[ iv] 1875 118 Damflask England South Yorkshire SK2840090700 53°24′44″N 1°34′27″W / 53.412351°N 1.5742116°W / 53.412351; -1.5742116 (Damflask Reservoir )
5,264,000 1864 1867 130 Darwell [ v] England East Sussex TQ7150021200 50°57′53″N 0°26′27″E / 50.964696°N 0.44093306°E / 50.964696; 0.44093306 (Darwell Reservoir )
4,730,000 1937 1949 194 Delph England Greater Manchester SD7030015400 53°38′03″N 2°27′02″W / 53.634273°N 2.4506272°W / 53.634273; -2.4506272 (Delph Reservoir )
2,326,700 1905[ i] 1921 80 Derwent England Derbyshire SK1730089800 53°24′17″N 1°44′28″W / 53.404740°N 1.7412482°W / 53.404740; -1.7412482 (Derwent Reservoir (Derbyshire) )
9,470,000 1899[ iv] 1916 19 Derwent Reservoir England County Durham NZ0250051400 54°51′27″N 1°57′45″W / 54.857386°N 1.9625840°W / 54.857386; -1.9625840 (Derwent Reservoir (Durham) )
50,060,000 1950[ vi] 1966 157 Digley England West Yorkshire SE1100007000 53°33′34″N 1°50′07″W / 53.559507°N 1.8354124°W / 53.559507; -1.8354124 (Digley Reservoir )
3,260,000 1937[ iv] 1954 258 Doe Park England West Yorkshire SE0780034200 53°48′15″N 1°52′59″W / 53.804041°N 1.8830465°W / 53.804041; -1.8830465 (Doe Park Reservoir )
422,000 1857 1862 266 Donolly Reservoir Scotland East Lothian NT5780068700 55°54′34″N 2°40′36″W / 55.909541°N 2.6766156°W / 55.909541; -2.6766156 (Donolly Reservoir )
209,000 NA NA 123 Dovestone England Greater Manchester SE0160003600 53°31′45″N 1°58′38″W / 53.529058°N 1.9773335°W / 53.529058; -1.9773335 (Dovestone Reservoir )
5,048,000 1958[ iv] 1966 43 Draycote Water England Warwickshire SP4600070000 52°19′34″N 1°19′35″W / 52.326175°N 1.3264618°W / 52.326175; -1.3264618 (Draycote Water )
22,730,000 1965[ vi] 1969 42 East Ings and Wood Holmes Washland Reservoir England North Yorkshire SE5230024300 53°42′45″N 1°12′33″W / 53.712507°N 1.2090737°W / 53.712507; -1.2090737 (East Ings and Wood Holmes Washland Reservoir )
23,700,000 NA NA 251 East Warwick England Greater London TQ3480088500 51°34′45″N 0°03′22″W / 51.579250°N 0.055985047°W / 51.579250; -0.055985047 (East Warwick Reservoir )
742,000 1853[ iv] 1900[ v] 103 Eccup England West Yorkshire SE3080041800 53°52′17″N 1°31′59″W / 53.871498°N 1.5330645°W / 53.871498; -1.5330645 (Eccup Reservoir )
6,410,000 1885 1897 153 Eglwys Nunydd Wales Neath Port Talbot SS7920085500 51°33′19″N 3°44′38″W / 51.555411°N 3.7438321°W / 51.555411; -3.7438321 (Eglwys Nunydd Reservoir )
3,311,000 1957[ v] 1963 148 Ennerdale Water England Cumbria NY0890015300 54°31′29″N 3°24′33″W / 54.524765°N 3.4090669°W / 54.524765; -3.4090669 (Ennerdale Water )
3,400,000 1902 1902 145 Entwistle England Blackburn with Darwen SD7200017500 53°39′12″N 2°25′30″W / 53.653241°N 2.4251088°W / 53.653241; -2.4251088 (Entwistle Reservoir )
3,464,000 1832 1838[ v] 134 Errwood England Derbyshire SK0140075200 53°16′26″N 1°58′50″W / 53.273783°N 1.9804662°W / 53.273783; -1.9804662 (Errwood Reservoir )
4,216,000 1930[ iv] 1967 90 Eyebrook England Leicestershire SP8480094700 52°32′37″N 0°45′04″W / 52.543560°N 0.75099918°W / 52.543560; -0.75099918 (Eyebrook Reservoir )
8,096,000 1937 1940 187 Farmoor No. 1 England Oxfordshire SP4450006800 51°45′29″N 1°21′24″W / 51.758126°N 1.3566759°W / 51.758126; -1.3566759 (Farmoor No. 1 Reservoir )
2,505,000 1962 1967 122 Farmoor No. 2 England Oxfordshire SP4450006000 51°45′03″N 1°21′24″W / 51.750934°N 1.3567780°W / 51.750934; -1.3567780 (Farmoor No. 2 Reservoir )
5,055,000 1962 1977 125 Fernilee England Derbyshire SK0130077700 53°17′47″N 1°58′55″W / 53.296255°N 1.9819564°W / 53.296255; -1.9819564 (Fernilee Reservoir )
4,944,000 1930[ iv] 1938 237 Fernworthy England Devon SX6710084300 50°38′35″N 3°52′52″W / 50.643190°N 3.8809759°W / 50.643190; -3.8809759 (Fernworthy Reservoir )
1,727,300 1934 1942 141 Fewston England North Yorkshire SE1870054100 53°58′57″N 1°42′59″W / 53.982621°N 1.7163354°W / 53.982621; -1.7163354 (Fewston Reservoir )
3,845,000 1874 1879 231 Ffynnon Llugwy Wales Conwy SH6920062400 53°08′34″N 3°57′25″W / 53.142643°N 3.9569822°W / 53.142643; -3.9569822 (Ffynnon Llugwy Reservoir )
1,776,000 1915 1926 174 Fiddler's Ferry P.S. Ash Lagoon D England Cheshire SJ5520085500 53°21′52″N 2°40′29″W / 53.364460°N 2.6746880°W / 53.364460; -2.6746880 (Fiddler's Ferry P.S. Ash Lagoon D )
2,900,000 NA NA 154 Fontburn England Northumberland NZ0450093500 55°14′08″N 1°55′51″W / 55.235687°N 1.9307831°W / 55.235687; -1.9307831 (Fontburn Reservoir )
3,279,000 1898[ iv] 1903 64 Foremark England Derbyshire SK3290024400 52°48′58″N 1°30′48″W / 52.816142°N 1.5132885°W / 52.816142; -1.5132885 (Foremark Reservoir )
13,193,490 1966 1977 76 Fruid Scotland Scottish Borders NT0968919217 55°27′30″N 3°25′47″W / 55.458437°N 3.4296968°W / 55.458437; -3.4296968 (Fruid Reservoir )
10,438,000 1953[ vi] 1968 82 Garreg Ddu Wales Powys SN9110063900 52°15′45″N 3°35′49″W / 52.262447°N 3.5970679°W / 52.262447; -3.5970679 (Garreg Ddu Reservoir )
9,222,000[ 2] 1892[ iv] 1904 89 Gladhouse Scotland Midlothian NT2977853599 55°46′14″N 3°07′15″W / 55.770608°N 3.1208736°W / 55.770608; -3.1208736 (Gladhouse Reservoir )
8,133,000 NA 1879 84 Glen Finglas Scotland Stirling NN5241009260 56°15′10″N 4°23′02″W / 56.252852°N 4.3838037°W / 56.252852; -4.3838037 (Glen Finglas Reservoir )
9,043,000 1911 1965 243 Glencorse Scotland Midlothian NT2164763897 55°51′43″N 3°15′12″W / 55.861862°N 3.2534157°W / 55.861862; -3.2534157 (Glencorse Reservoir )
1,673,000 1819 1824 236 Gorple Upper England West Yorkshire SD9240031400 53°46′44″N 2°07′01″W / 53.778874°N 2.1168095°W / 53.778874; -2.1168095 (Gorple Upper Reservoir )
1,731,000 1928 1934 110 Gouthwaite England North Yorkshire SE1300069000 54°07′00″N 1°48′09″W / 54.116708°N 1.8026204°W / 54.116708; -1.8026204 (Gouthwaite Reservoir )
5,810,789 1893 1901 17 Grafham Water [ v] England Cambridgeshire TL1700067000 52°17′19″N 0°17′10″W / 52.288689°N 0.28606805°W / 52.288689; -0.28606805 (Grafham Water )
55,490,000 1961[ vi] 1965 109 Grassholme England County Durham NY9380022400 54°35′48″N 2°05′51″W / 54.596742°N 2.0974750°W / 54.596742; -2.0974750 (Grassholme Reservoir )
6,060,000 1876[ iv] 1915 146 Greenbooth England Greater Manchester SD8530015200 53°37′59″N 2°13′26″W / 53.633114°N 2.2237757°W / 53.633114; -2.2237757 (Greenbooth Reservoir )
3,405,000 1958 1962 45 Grimwith England North Yorkshire SE0600064200 54°04′25″N 1°54′35″W / 54.073696°N 1.9097996°W / 54.073696; -1.9097996 (Grimwith Reservoir )
22,200,000 1856[ vi] 1864 163 Hallington East England Northumberland NY9730076300 55°04′52″N 2°02′38″W / 55.081140°N 2.0438290°W / 55.081140; -2.0438290 (Hallington East Reservoir )
3,116,740 1863 1872 149 Hallington West England Northumberland NY9650076000 55°04′42″N 2°03′23″W / 55.078439°N 2.0563562°W / 55.078439; -2.0563562 (Hallington West Reservoir )
3,380,000 1876 1890 272 Hampton - Sunnyside England Greater London TQ1270069000 51°24′32″N 0°22′52″W / 51.408835°N 0.38099829°W / 51.408835; -0.38099829 (Hampton - Sunnyside Reservoir )
71,000 1852[ iv] 1855 36 Hanningfield England Essex TQ7330098400 51°39′28″N 0°30′14″E / 51.657668°N 0.50402549°E / 51.657668; 0.50402549 (Hanningfield Reservoir )
27,721,000 1949[ vi] 1957 13 Haweswater England Cumbria NY5000015500 54°31′56″N 2°46′27″W / 54.532294°N 2.7741697°W / 54.532294; -2.7741697 (Haweswater Reservoir )
84,840,000 1880[ vi] 1935 176 Heaton Park England Greater Manchester SD8250004700 53°32′19″N 2°15′56″W / 53.538652°N 2.2655256°W / 53.538652; -2.2655256 (Heaton Park Reservoir )
2,800,000 1954 1955 263 Hewenden England West Yorkshire SE0740035600 53°49′00″N 1°53′21″W / 53.816630°N 1.8890870°W / 53.816630; -1.8890870 (Hewenden Reservoir )
252,000 1842 1846 254 High Maynard England Greater London TQ3550089600 51°35′20″N 0°02′44″W / 51.588967°N 0.045464928°W / 51.588967; -0.045464928 (High Maynard Reservoir )
659,000 1867[ iv] [ v] 1870[ v] 181 Hilfield Park [ v] England Hertfordshire TQ1570096000 51°39′03″N 0°19′44″W / 51.650897°N 0.32902291°W / 51.650897; -0.32902291 (Hilfield Park Reservoir )
2,728,000 NA 1955 189 Hollingworth Lake England Greater Manchester SD9350015300 53°38′03″N 2°05′59″W / 53.634181°N 2.0997734°W / 53.634181; -2.0997734 (Hollingworth Lake )
2,468,000 1794 1800 213 Hollowell England Northamptonshire SP6900072400 52°20′43″N 0°59′19″W / 52.345343°N 0.98853688°W / 52.345343; -0.98853688 (Hollowell Reservoir )
2,064,000 1936 1939 256 Hopes Scotland East Lothian NT5470062100 55°51′00″N 2°43′30″W / 55.849963°N 2.7250932°W / 55.849963; -2.7250932 (Hopes Reservoir )
600,000 NA 1933 85 Howden England Derbyshire SK1700092500 53°25′44″N 1°44′44″W / 53.429018°N 1.7456160°W / 53.429018; -1.7456160 (Howden Reservoir )
8,990,000 1899[ iv] 1916 139 Hury England County Durham NY9650019600 54°34′18″N 2°03′20″W / 54.571606°N 2.0556516°W / 54.571606; -2.0556516 (Hury Reservoir )
3,905,000 1876[ iv] 1894 137 Island Barn England Surrey TQ1390067000 51°23′26″N 0°21′52″W / 51.390619°N 0.36439363°W / 51.390619; -0.36439363 (Island Barn Reservoir )
4,011,000 1900[ iv] 1911 215 Jumbles England Greater Manchester SD7350013900 53°37′15″N 2°24′08″W / 53.620963°N 2.4021067°W / 53.620963; -2.4021067 (Jumbles Reservoir )
2,050,000 1971 1971 61 Kellington Ings Reservoir England North Yorkshire SE5910024500 53°42′49″N 1°06′22″W / 53.713581°N 1.1060210°W / 53.713581; -1.1060210 (Kellington Ings Reservoir )
14,400,000 NA NA 6 Kielder England Northumberland NY7080087500 55°10′51″N 2°27′36″W / 55.180922°N 2.4600692°W / 55.180922; -2.4600692 (Kielder Reservoir )
199,000,000 1971[ vi] 1981 159 Killington England Cumbria SD5900091000 54°18′47″N 2°37′54″W / 54.312936°N 2.6317055°W / 54.312936; -2.6317055 (Killington Reservoir )
3,238,210 1817 1819 217 Kinder England Derbyshire SK0585088190 53°23′26″N 1°54′49″W / 53.390517°N 1.9135015°W / 53.390517; -1.9135015 (Kinder Reservoir )
2,028,000 1899[ iv] 1912 72 King George V England Greater London TQ3740096500 51°39′02″N 0°00′55″W / 51.650510°N 0.015352701°W / 51.650510; -0.015352701 (King George V Reservoir )
10,981,000 1893 1912 51 King George VI England Surrey TQ0410073200 51°26′54″N 0°30′12″W / 51.448229°N 0.50336831°W / 51.448229; -0.50336831 (King George VI Reservoir )
18,732,000 1936 1947 35 Ladybower England Derbyshire SK2000085500 53°21′58″N 1°42′03″W / 53.365994°N 1.7009077°W / 53.365994; -1.7009077 (Ladybower Reservoir )
27,800,000 1920[ iv] 1943 222 Lamaload England Cheshire SJ9710075300 53°16′29″N 2°02′42″W / 53.274675°N 2.0449474°W / 53.274675; -2.0449474 (Lamaload Reservoir )
1,932,000 1958 1963 104 Langsett England South Yorkshire SE2140000200 53°29′53″N 1°40′44″W / 53.498069°N 1.6788755°W / 53.498069; -1.6788755 (Langsett Reservoir )
6,401,000 1897 1904 259 Leeming England West Yorkshire SE0380034400 53°48′21″N 1°56′38″W / 53.805882°N 1.9437800°W / 53.805882; -1.9437800 (Leeming Reservoir )
408,000 1872 1878 113 Leigh Barrier (Medway) FSR England Kent TQ5650046300 51°11′40″N 0°14′18″E / 51.194493°N 0.23836213°E / 51.194493; 0.23836213 (Leigh Barrier (Medway) FSR )
5,580,000 1976[ iv] 1982 128 Leighton England North Yorkshire SE1620078800 54°12′17″N 1°45′11″W / 54.204694°N 1.7531441°W / 54.204694; -1.7531441 (Leighton Reservoir )
4,780,000 1908 1926 165 Lindley Wood England North Yorkshire SE2150049300 53°56′22″N 1°40′26″W / 53.939372°N 1.6739758°W / 53.939372; -1.6739758 (Lindley Wood Reservoir )
3,045,000 1870 1874 167 Linton Ings England North Yorkshire SE4840060400 54°02′14″N 1°15′45″W / 54.037317°N 1.2624729°W / 54.037317; -1.2624729 (Linton Ings Reservoir )
3,000,000 NA NA 238 Little Swinburne England Northumberland NY9450077200 55°05′21″N 2°05′16″W / 55.089204°N 2.0877054°W / 55.089204; -2.0877054 (Little Swinburne Reservoir )
1,721,000 1863 1879 41 Llandegfedd Wales Monmouhtshire / Torfaen ST3260098500 51°40′52″N 2°58′35″W / 51.681200°N 2.9762550°W / 51.681200; -2.9762550 (Llandegfedd Reservoir )
24,492,000 1957[ vi] 1964 121 Llwyn-On Wales Rhondda Cynon Taf SO0110011400 51°47′33″N 3°26′07″W / 51.792479°N 3.4354039°W / 51.792479; -3.4354039 (Llwyn-On Reservoir )
5,066,000 1884[ iv] 1926 95 Llyn Alaw Wales Gwynedd SH3740085400 53°20′26″N 4°26′37″W / 53.340440°N 4.4437297°W / 53.340440; -4.4437297 (Llyn Alaw Reservoir )
7,400,000 1961 1965 230 Llyn Aled [ v] Wales Conwy SH9160057900 53°06′26″N 3°37′15″W / 53.107241°N 3.6207301°W / 53.107241; -3.6207301 (Llyn Aled Reservoir )
1,777,000 NA 1934 93 Llyn Arenig Fawr Wales Gwynedd SH8500037900 52°55′34″N 3°42′44″W / 52.926156°N 3.7121426°W / 52.926156; -3.7121426 (Llyn Arenig Fawr Reservoir )
7,488,000 NA 1830 18 Llyn Brenig Wales Conwy / Denbighshire SH9770054300 53°04′34″N 3°31′43″W / 53.076098°N 3.5284979°W / 53.076098; -3.5284979 (Llyn Brenig Reservoir )
54,273,000 1973[ vi] 1979 30 Llyn Brianne Wales Powys SN7910048500 52°07′18″N 3°46′02″W / 52.121552°N 3.7673117°W / 52.121552; -3.7673117 (Llyn Brianne Reservoir )
32,882,000 1967[ vi] 1972 23 Llyn Celyn Wales Gwynedd SH8592140424 52°56′57″N 3°41′58″W / 52.949031°N 3.6993374°W / 52.949031; -3.6993374 (Llyn Celyn Reservoir )
40,959,000 1957[ vi] 1965 21 Clywedog Reservoir (Llyn Clywedog) Wales Powys SN8980088500 52°29′00″N 3°37′27″W / 52.483257°N 3.6242003°W / 52.483257; -3.6242003 (Clywedog Reservoir )
48,828,000 1963[ vi] 1967 81 Llyn Cowlyd Wales Conwy SH7380063400 53°09′10″N 3°53′19″W / 53.152737°N 3.8886457°W / 53.152737; -3.8886457 (Llyn Cowlyd Reservoir )
9,432,000 1891[ iv] 1897 241 Llyn Cwellyn [ v] Wales Gwynedd SH5540055600 53°04′41″N 4°09′36″W / 53.077993°N 4.1600815°W / 53.077993; -4.1600815 (Llyn Cwellyn Reservoir )
1,687,000 NA 1976 173 Llyn Cwmystradllyn[ v] Wales Gwynedd SH5620044300 52°58′36″N 4°08′35″W / 52.976703°N 4.1431080°W / 52.976703; -4.1431080 (Llyn Cwmystradllyn Reservoir )
2,902,000 1959 1959 226 Llyn Peris Wales Gwynedd SH5870059900 53°07′03″N 4°06′46″W / 53.117503°N 4.1127477°W / 53.117503; -4.1127477 (Llyn Peris Reservoir )
1,870,000 1973 1979 250 Llyn Stwlan Wales Gwynedd SH6660044400 52°58′49″N 3°59′18″W / 52.980292°N 3.9883645°W / 52.980292; -3.9883645 (Llyn Stwlan Reservoir )
747,000 1952[ vi] 1963 11 Bala Lake (Llyn Tegid) Wales Gwynedd SH9290035000 52°54′06″N 3°35′37″W / 52.901732°N 3.5937195°W / 52.901732; -3.5937195 (Llyn Tegid (Bala Lake) Reservoir )
106,751,000 1803 1804 40 Llyn Trawsfynydd Wales Gwynedd SH6940038200 52°55′31″N 3°56′39″W / 52.925281°N 3.9441860°W / 52.925281; -3.9441860 (Llyn Trawsfynydd Reservoir )
26,108,000 1924[ v] 1928 140 Loch Achonachie Scotland Highland NH4460054600 57°33′17″N 4°35′56″W / 57.554706°N 4.5988314°W / 57.554706; -4.5988314 (Loch Achonachie Reservoir )
3,873,000 1943[ ii] 1954[ iii] 37 Loch an Diamh Scotland Perth and Kinross NN5086746354 56°35′07″N 4°25′47″W / 56.585328°N 4.4298309°W / 56.585328; -4.4298309 (Loch an Diamh Reservoir )
27,052,000 1953[ vi] 1959[ iii] 57 Loch Arklet Scotland Stirling NN3778009120 56°14′49″N 4°37′11″W / 56.246825°N 4.6195911°W / 56.246825; -4.6195911 (Loch Arklet Reservoir )
16,286,000 1902 1914 54 Loch Bradan Scotland South Ayrshire NX4205297297 55°14′40″N 4°29′10″W / 55.244500°N 4.4860239°W / 55.244500; -4.4860239 (Loch Bradan Reservoir )
17,475,000 1908[ iv] 1912 105 Loch Drunkie Scotland Stirling NN5425004390 56°12′35″N 4°21′05″W / 56.209704°N 4.3514522°W / 56.209704; -4.3514522 (Loch Drunkie Reservoir )
6,346,000 1854 1864 4 Loch Earn Scotland Perth and Kinross NN6990024200 56°23′32″N 4°06′33″W / 56.392099°N 4.1091174°W / 56.392099; -4.1091174 (Loch Earn Reservoir )
397,630,000 1943[ ii] 1958[ iii] 190 Loch Eigheach Gaur Scotland Perth and Kinross NN4610056900 56°40′42″N 4°30′49″W / 56.678440°N 4.5136547°W / 56.678440; -4.5136547 (Loch Eigheach Gaur Reservoir )
2,461,000 1943[ ii] 1953[ iii] 1 Loch Ericht Scotland Perth and Kinross NN5080062700 56°43′55″N 4°26′25″W / 56.732022°N 4.4403880°W / 56.732022; -4.4403880 (Loch Ericht Reservoir )
1,291,596,000 1912[ vi] 1962[ iii] 8 Loch Garry Scotland Highland NH2760002100 57°04′39″N 4°50′45″W / 57.077537°N 4.8459025°W / 57.077537; -4.8459025 (Loch Garry Reservoir )
163,272,000 1943[ ii] 1956[ iii] 249 Loch Gleann A'Bhearraidh Scotland Argyll and Bute NM8446426911 56°23′07″N 5°29′35″W / 56.385184°N 5.4930136°W / 56.385184; -5.4930136 (Loch Gleann A'Bhearraidh Reservoir )
774,000 1939 1939 2 Loch Katrine Scotland Stirling NN4433509530 56°15′10″N 4°30′51″W / 56.252698°N 4.5141613°W / 56.252698; -4.5141613 (Loch Katrine Reservoir )
804,704,000 1848 1859 49 Loch Loyne Scotland Highland NH2010007900 57°07′36″N 4°58′25″W / 57.126700°N 4.9736204°W / 57.126700; -4.9736204 (Loch Loyne Reservoir )
19,859,000 1938[ vi] 1957[ iii] 9 Loch Luichart Scotland Highland NH3650061500 57°36′50″N 4°44′19″W / 57.613757°N 4.7386845°W / 57.613757; -4.7386845 (Loch Luichart Reservoir )
128,124,000 1943[ ii] 1954[ iii] 16 Loch Lyon Scotland Perth and Kinross NN4520041700 56°32′30″N 4°31′09″W / 56.541721°N 4.5192239°W / 56.541721; -4.5192239 (Loch Lyon Reservoir )
59,270,000 1951[ vi] 1958[ iii] 58 Loch Nant Scotland Argyll and Bute NN0030024900 56°22′27″N 5°14′08″W / 56.374101°N 5.2354396°W / 56.374101; -5.2354396 (Loch Nant Reservoir )
15,464,000 1959[ vi] 1963[ iii] 3 Loch Quoich Scotland Highland NH0710002300 57°04′16″N 5°11′01″W / 57.071201°N 5.1837051°W / 57.071201; -5.1837051 (Loch Quoich Reservoir )
556,677,000 1928[ vi] 1955[ iii] 260 Loch Spey Scotland Highland NN5810093700 57°00′45″N 4°20′19″W / 57.012555°N 4.3384944°W / 57.012555; -4.3384944 (Loch Spey Reservoir )
356,000 1918[ iv] 1938 86 Loch Thom Scotland Renfrewshire NS2594872193 55°54′41″N 4°47′11″W / 55.911261°N 4.7862577°W / 55.911261; -4.7862577 (Loch Thom Reservoir )
8,668,000 1824 1827 65 Loch Vaich Scotland Highland NH3460074900 57°44′00″N 4°46′47″W / 57.733285°N 4.7796402°W / 57.733285; -4.7796402 (Loch Vaich Reservoir )
12,388,000 1943[ ii] 1957[ iii] 20 Loch Venachar Scotland Stirling NN5743905550 56°13′16″N 4°18′03″W / 56.221084°N 4.3007086°W / 56.221084; -4.3007086 (Loch Venachar Reservoir )
49,358,000 1854 1857 211 Lockwood England Greater London TQ3530090200 51°35′40″N 0°02′53″W / 51.594407°N 0.048118991°W / 51.594407; -0.048118991 (Lockwood Reservoir )
2,106,000 1893[ iv] 1903 257 Loganlea Scotland Midlothian NT1944262397 55°50′53″N 3°17′17″W / 55.848025°N 3.2881891°W / 55.848025; -3.2881891 (Loganlea Reservoir )
532,000 1847 1851 271 Low Maynard England Greater London TQ3550089600 51°35′20″N 0°02′44″W / 51.588967°N 0.045464928°W / 51.588967; -0.045464928 (Low Maynard Reservoir )
80,000 1867[ iv] [ v] 1870[ v] 124 Marchlyn Mawr Wales Gwynedd SH6170062200 53°08′20″N 4°04′08″W / 53.138951°N 4.0689468°W / 53.138951; -4.0689468 (Marchlyn Mawr Reservoir )
5,017,000 1973 1979 14 Megget Scotland Scottish Borders NT1925822198 55°29′13″N 3°16′45″W / 55.486890°N 3.2792883°W / 55.486890; -3.2792883 (Megget Reservoir )
63,722,000 1963 1983 162 Meldon England Devon SX5630091600 50°42′22″N 4°02′11″W / 50.706230°N 4.0364604°W / 50.706230; -4.0364604 (Meldon Reservoir )
3,170,000 1962[ vi] 1972 245 Mickletown Washland England West Yorkshire SE4150027100 53°44′19″N 1°22′20″W / 53.738640°N 1.3723192°W / 53.738640; -1.3723192 (Mickletown Washland Reservoir )
1,655,000 NA NA 227 Midhope England South Yorkshire SK2230099400 53°29′27″N 1°39′55″W / 53.490841°N 1.6653653°W / 53.490841; -1.6653653 (Midhope Reservoir )
1,859,000 1895 1903 244 Misson East FSA England Nottinghamshire SK7090094900 53°26′46″N 0°56′02″W / 53.446107°N 0.93397635°W / 53.446107; -0.93397635 (Misson East FSA )
1,670,000 NA NA 233 Misson West FSA England Nottinghamshire SK6850094000 53°26′18″N 0°58′13″W / 53.438336°N 0.97030047°W / 53.438336; -0.97030047 (Misson West FSA )
1,750,000 NA NA 207 More Hall England South Yorkshire SK2870095800 53°27′29″N 1°34′09″W / 53.458175°N 1.5692355°W / 53.458175; -1.5692355 (More Hall Reservoir )
2,172,989 1867 1929 7 Mullardoch Scotland Highland NH2220031300 57°20′15″N 4°57′21″W / 57.337439°N 4.9557405°W / 57.337439; -4.9557405 (Mullardoch Reservoir )
165,226,000 1943[ ii] 1951 39 Nant-y-Moch Wales Ceredigion SN7540086200 52°27′34″N 3°50′07″W / 52.459490°N 3.8352785°W / 52.459490; -3.8352785 (Nant-y-Moch Reservoir )
26,292,000 1955[ iv] 1964 193 Northampton Washlands England West Northamptonshire SP7950060200 52°14′03″N 0°50′14″W / 52.234265°N 0.83730834°W / 52.234265; -0.83730834 (Northampton Washlands )
2,340,000 NA NA 107 Ogston England Derbyshire SK3780059900 53°08′06″N 1°26′11″W / 53.134923°N 1.4364542°W / 53.134923; -1.4364542 (Ogston Reservoir )
6,180,000 1953[ iv] 1958 198 Oldbury Power Station England Gloucestershire ST6000095000 51°39′08″N 2°34′46″W / 51.652358°N 2.5795759°W / 51.652358; -2.5795759 (Oldbury Power Station Reservoir )
2,300,000 NA NA 12 Ouse Washes England Cambridgeshire TL5000089000 52°28′42″N 0°12′26″E / 52.478317°N 0.20724239°E / 52.478317; 0.20724239 (Ouse Washes Reservoir )
90,000,000 NA 1652 114 Penygarreg Wales Powys SN9030067400 52°17′37″N 3°36′36″W / 52.293742°N 3.6099246°W / 52.293742; -3.6099246 (Penygarreg Reservoir )
5,558,000 1892[ iv] 1904 53 Pitsford England Northamptonshire SP7550068900 52°18′47″N 0°53′38″W / 52.313028°N 0.89392331°W / 52.313028; -0.89392331 (Pitsford Reservoir )
17,545,000 1946 1955 74 Pontsticill (Taf Fechan) Wales Merthyr Tydfil / Powys SO0610011800 51°47′49″N 3°21′47″W / 51.796937°N 3.3630375°W / 51.796937; -3.3630375 (Pontsticill (Taf Fechan) Reservoir )
10,717,000 1921[ vi] 1927 55 Queen Elizabeth II England Surrey TQ1180067100 51°23′31″N 0°23′40″W / 51.391935°N 0.39453096°W / 51.391935; -0.39453096 (Queen Elizabeth II Reservoir )
16,809,000 1935 1967 33 Queen Mary England Surrey TQ0730069700 51°24′58″N 0°27′30″W / 51.416173°N 0.45839646°W / 51.416173; -0.45839646 (Queen Mary Reservoir )
30,363,000 1911[ vi] 1925 31 Queen Mother England Berkshire TQ0090076800 51°28′52″N 0°32′54″W / 51.481166°N 0.54837454°W / 51.481166; -0.54837454 (Queen Mother Reservoir )
31,492,000 1945[ vi] 1976 225 Ravensthorpe England West Northamptonshire SP6810070400 52°19′39″N 1°00′08″W / 52.327477°N 1.0021509°W / 52.327477; -1.0021509 (Ravensthorpe Reservoir )
1,884,000 1880 1890 200 Rhodeswood England Derbyshire SK0440098200 53°28′50″N 1°56′07″W / 53.480505°N 1.9351681°W / 53.480505; -1.9351681 (Rhodeswood Reservoir )
2,273,000 1848 1855 262 River Shin Scotland Highland NC5820005100 58°00′45″N 4°24′06″W / 58.012378°N 4.4016958°W / 58.012378; -4.4016958 (River Shin Reservoir )
316,000 1954[ vi] 1958[ iii] 161 River Till Controlled Washland England Nottinghamshire SK7030077500 53°17′23″N 0°56′49″W / 53.289812°N 0.94687140°W / 53.289812; -0.94687140 (River Till Controlled Washland )
3,200,000 1977 1990 106 River Witham Flood Washlands England Lincolnshire SK9520063800 53°09′46″N 0°34′39″W / 53.162822°N 0.57753531°W / 53.162822; -0.57753531 (River Witham Flood Washlands )
6,300,000 NA NA 100 Rivington Lower England Lancashire SD6300012400 53°36′25″N 2°33′38″W / 53.606843°N 2.5606621°W / 53.606843; -2.5606621 (Rivington Lower )
6,516,000 1850 1857 27 Roadford England Devon SX4200090000 50°41′17″N 4°14′17″W / 50.688140°N 4.2381365°W / 50.688140; -4.2381365 (Roadford Reservoir )
36,910,000 1976[ vi] 1989 188 Roundhill England North Yorkshire SE1500077200 54°11′25″N 1°46′18″W / 54.190351°N 1.7716197°W / 54.190351; -1.7716197 (Roundhill Reservoir )
2,503,000 NA 1910 170 Rudyard England Staffordshire SJ9450059600 53°08′01″N 2°05′01″W / 53.133529°N 2.0836602°W / 53.133529; -2.0836602 (Rudyard Reservoir )
2,949,700 NA 1796 10 Rutland Water England Rutland SK9440008000 52°39′41″N 0°36′20″W / 52.661511°N 0.60569370°W / 52.661511; -0.60569370 (Rutland Water )
124,000,000 1968[ vi] 1976 242 Scaling England North Yorkshire NZ7490012800 54°30′18″N 0°50′41″W / 54.504993°N 0.84482832°W / 54.504993; -0.84482832 (Scaling Reservoir )
1,682,000 1946 1958 91 Scammonden England West Yorkshire SE0530016700 53°38′48″N 1°55′17″W / 53.646781°N 1.9212997°W / 53.646781; -1.9212997 (Scammonden Reservoir )
7,873,000 1965 1969 77 Scar House England North Yorkshire SE0580076900 54°11′16″N 1°54′45″W / 54.187839°N 1.9126169°W / 54.187839; -1.9126169 (Scar House Reservoir )
10,069,000 1921 1936 171 Seathwaite Tarn England Cumbria SD2500098600 54°22′38″N 3°09′22″W / 54.377355°N 3.1561370°W / 54.377355; -3.1561370 (Seathwaite Tarn Reservoir )
2,945,000 1900 1907 59 Selset England County Durham NY9180021100 54°35′06″N 2°07′42″W / 54.585031°N 2.1283928°W / 54.585031; -2.1283928 (Selset Reservoir )
15,320,000 1955 1960 223 Shustoke Lower England Warwickshire SP2280091200 52°31′06″N 1°39′56″W / 52.518210°N 1.6654290°W / 52.518210; -1.6654290 (Shustoke Lower Reservoir )
1,921,000 1870[ iv] 1884 150 Siblyback England Cornwall SX2320070300 50°30′21″N 4°29′41″W / 50.505737°N 4.4946487°W / 50.505737; -4.4946487 (Siblyback Reservoir )
3,364,000 1965 1969 62 Silent Valley Northern Ireland County Down SB3865978967 54°08′24″N 6°00′10″W / 54.139876°N 6.0027439°W / 54.139876; -6.0027439 (Silent Valley Reservoir )
13,638,270 1910 1933 97 Staines North England Surrey TQ0500073600 51°27′06″N 0°29′25″W / 51.451658°N 0.49030334°W / 51.451658; -0.49030334 (Staines North Reservoir )
6,940,000 1898[ iv] 1902 94 Staines South England Surrey TQ0500072500 51°26′30″N 0°29′26″W / 51.441771°N 0.49062937°W / 51.441771; -0.49062937 (Staines South Reservoir )
7,469,000 1898[ iv] 1902 99 Staunton Harold England Derbyshire SK3767923473 52°48′27″N 1°26′33″W / 52.807498°N 1.4424902°W / 52.807498; -1.4424902 (Staunton Harold Reservoir )
6,655,000 1958[ vi] 1964 115 Stithians England Cornwall SW7190036400 50°11′01″N 5°11′47″W / 50.183607°N 5.1965073°W / 50.183607; -5.1965073 (Stithians Reservoir )
5,420,000 1955[ vi] 1967 68 Stocks England Lancashire SD7200054600 53°59′12″N 2°25′43″W / 53.986684°N 2.4284992°W / 53.986684; -2.4284992 (Stocks Reservoir )
11,800,000 1910 1932 203 Strines England South Yorkshire SK2320090500 53°24′39″N 1°39′09″W / 53.410806°N 1.6524541°W / 53.410806; -1.6524541 (Strines Reservoir )
2,239,000 1853[ iv] 1869 184 Sutton Bingham England Somerset ST5540011400 50°54′01″N 2°38′08″W / 50.900343°N 2.6356000°W / 50.900343; -2.6356000 (Sutton Bingham Reservoir )
2,600,000 1952 1955 138 Swinsty England North Yorkshire SE1960053400 53°58′35″N 1°42′10″W / 53.976296°N 1.7026564°W / 53.976296; -1.7026564 (Swinsty Reservoir )
3,936,000 1871 1877 204 Swithland England Leicestershire SK5570014800 52°43′41″N 1°10′36″W / 52.727983°N 1.1766534°W / 52.727983; -1.1766534 (Swithland Reservoir )
2,227,540 1890 1896 180 "Tadcaster, Hackenby, North Ings and Cock Beck" England North Yorkshire SE4950042000 53°52′19″N 1°14′55″W / 53.871853°N 1.2486563°W / 53.871853; -1.2486563 (Tadcaster, Hackenby, North Ings and Cock Beck Reservoir )
2,748,750 NA NA 66 Talla Scotland Scottish Borders NT1171721532 55°28′47″N 3°23′54″W / 55.479603°N 3.3983738°W / 55.479603; -3.3983738 (Talla Reservoir )
12,020,000 1897 1905 67 Talybont Wales Powys SO1060020500 51°52′33″N 3°18′00″W / 51.875877°N 3.3000529°W / 51.875877; -3.3000529 (Talybont Reservoir )
11,921,000 1930 1939 221 Tanygrisiau Wales Gwynedd SH6830044700 52°59′00″N 3°57′47″W / 52.983408°N 3.9631826°W / 52.983408; -3.9631826 (Tanygrisiau Reservoir )
1,970,000 1952[ vi] 1963 25 Thirlmere England Cumbria NY3100019000 54°33′41″N 3°04′07″W / 54.561506°N 3.0685524°W / 54.561506; -3.0685524 (Thirlmere Reservoir )
40,714,000 1879[ vi] 1894 92 Thruscross England North Yorkshire SE1520057800 54°00′58″N 1°46′10″W / 54.015989°N 1.7695224°W / 54.015989; -1.7695224 (Thruscross Reservoir )
7,800,000 1955[ vi] 1966 101 Tittesworth England Staffordshire SJ9930058700 53°07′32″N 2°00′43″W / 53.125468°N 2.0119145°W / 53.125468; -2.0119145 (Tittesworth Reservoir )
6,440,000 1858 1858 98 Torside England Derbyshire SK0560098300 53°28′53″N 1°55′02″W / 53.481393°N 1.9170845°W / 53.481393; -1.9170845 (Torside Reservoir )
6,700,000 1848 1864 192 Tunstall England County Durham NZ0650040800 54°45′44″N 1°54′02″W / 54.762095°N 1.9005097°W / 54.762095; -1.9005097 (Tunstall Reservoir )
2,360,000 1873 1879 169 Underbank England South Yorkshire SK2530099200 53°29′20″N 1°37′13″W / 53.488908°N 1.6201667°W / 53.488908; -1.6201667 (Underbank Reservoir )
2,955,000 1897 1904 71 Usk Wales Carmarthenshire / Powys SN8217428549 51°56′35″N 3°42′56″W / 51.942925°N 3.7155557°W / 51.942925; -3.7155557 (Usk Reservoir )
11,235,000 1950 1955 182 Vale House England Derbyshire SK0326097420 53°28′25″N 1°57′08″W / 53.473502°N 1.9523536°W / 53.473502; -1.9523536 (Vale House Reservoir )
2,688,000 1848 1870 15 Vyrnwy Wales Powys SJ0180019300 52°45′44″N 3°27′24″W / 52.762346°N 3.4567214°W / 52.762346; -3.4567214 (Vyrnwy Reservoir )
59,852,000 1879[ i] 1888 252 Walthamstow No.4 England Greater London TQ3540089100 51°35′04″N 0°02′50″W / 51.584498°N 0.047100199°W / 51.584498; -0.047100199 (Walthamstow No.4 Reservoir )
680,000 1853[ iv] 1866[ v] 253 Walthamstow No.5 England Greater London TQ3550088600 51°34′48″N 0°02′45″W / 51.579981°N 0.045850528°W / 51.579981; -0.045850528 (Walthamstow No.5 Reservoir )
680,000 1853[ iv] 1866[ v] 179 Walton - Bessborough England Surrey TQ1220068000 51°24′00″N 0°23′19″W / 51.399946°N 0.38850014°W / 51.399946; -0.38850014 (Walton - Bessborough Reservoir )
2,757,000 1898 1907 228 Walton - Knight England Surrey TQ1170068000 51°24′00″N 0°23′44″W / 51.400044°N 0.39568466°W / 51.400044; -0.39568466 (Walton - Knight Reservoir )
1,857,000 1898 1907 216 Waskerley England County Durham NZ0250044300 54°47′37″N 1°57′46″W / 54.793583°N 1.9626426°W / 54.793583; -1.9626426 (Waskerley Reservoir )
2,046,500 1877 1877 156 Watergrove England Greater Manchester SD9100017700 53°39′21″N 2°08′16″W / 53.655715°N 2.1376509°W / 53.655715; -2.1376509 (Watergrove Reservoir )
3,273,000 1930 1938 120 Wayoh England Lancashire SD7370016400 53°38′36″N 2°23′57″W / 53.643443°N 2.3992954°W / 53.643443; -2.3992954 (Wayoh Reservoir )
5,100,000 1865[ vi] 1876 112 Weirwood England East Sussex TQ4060035300 51°05′59″N 0°00′24″E / 51.099772°N 0.0066761370°E / 51.099772; 0.0066761370 (Weirwood Reservoir )
5,623,000 1950 1954 235 Wentwood Wales Newport ST4300092900 51°37′55″N 2°49′30″W / 51.632009°N 2.8249355°W / 51.632009; -2.8249355 (Wentwood Reservoir )
1,739,000 1896 1904 117 West Moor Reservoir England Somerset ST4160032600 51°05′23″N 2°50′07″W / 51.089725°N 2.8352377°W / 51.089725; -2.8352377 (West Moor Reservoir )
5,359,000 NA NA 255 West Warwick England Greater London TQ3460088300 51°34′39″N 0°03′32″W / 51.577501°N 0.058946209°W / 51.577501; -0.058946209 (West Warwick Reservoir )
639,000 1853[ iv] 1900[ v] 151 West Water Scotland Scottish Borders NT1173052377 55°45′24″N 3°24′29″W / 55.756672°N 3.4080668°W / 55.756672; -3.4080668 (West Water Reservoir )
3,364,000 1966 1969 199 Wet Sleddale England Cumbria NY5530011600 54°29′52″N 2°41′30″W / 54.497744°N 2.6916824°W / 54.497744; -2.6916824 (Wet Sleddale Reservoir )
2,282,000 1880[ vi] 1966 247 White Holme England West Yorkshire SD9710019900 53°40′32″N 2°02′43″W / 53.675560°N 2.0453756°W / 53.675560; -2.0453756 (White Holme Reservoir )
1,601,000 1807[ iv] 1816 133 Whiteadder Scotland East Lothian NT6540063500 55°51′48″N 2°33′16″W / 55.863430°N 2.5543847°W / 55.863430; -2.5543847 (Whiteadder Reservoir )
4,239,000 1959[ v] 1968 172 Widdop England West Yorkshire SD9300033000 53°47′36″N 2°06′28″W / 53.793263°N 2.1077415°W / 53.793263; -2.1077415 (Widdop Reservoir )
2,912,000 1872 1878 219 Willen Lake England Buckinghamshire SP8810040900 52°03′34″N 0°42′59″W / 52.059485°N 0.71640948°W / 52.059485; -0.71640948 (Willen Lake Reservoir )
2,004,000 1967 1972 56 William Girling England Greater London TQ3670094100 51°37′45″N 0°01′35″W / 51.629115°N 0.026400980°W / 51.629115; -0.026400980 (William Girling Reservoir )
16,500,000 1935[ v] 1951 46 Wimbleball England Somerset SS9670029300 51°03′13″N 3°28′31″W / 51.053723°N 3.4752172°W / 51.053723; -3.4752172 (Wimbleball Reservoir )
21,541,000 1968 1979 87 Winscar England South Yorkshire SE1530002600 53°31′11″N 1°46′15″W / 53.519852°N 1.7707125°W / 53.519852; -1.7707125 (Winscar Reservoir )
8,300,000 1970[ vi] 1975 131 Woodhead England Derbyshire SK0820099400 53°29′28″N 1°52′40″W / 53.491247°N 1.8778781°W / 53.491247; -1.8778781 (Woodhead Reservoir )
4,700,000 1848 1877 38 Wraysbury England Surrey TQ0250074500 51°27′37″N 0°31′34″W / 51.460205°N 0.52600813°W / 51.460205; -0.52600813 (Wraysbury Reservoir )
26,910,000 1945[ vi] 1970 158 Yarrow [ v] England Lancashire SD6240015500 53°38′05″N 2°34′12″W / 53.634662°N 2.5701051°W / 53.634662; -2.5701051 (Yarrow Reservoir )
3,252,000 1850 1877 155 Ystradfellte Wales Powys SN9460017500 51°50′46″N 3°31′53″W / 51.846116°N 3.5314738°W / 51.846116; -3.5314738 (Ystradfellte Reservoir )
3,277,000 1902[ vi] 1914 
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