344:
362:
city of
Worcester, the Bristol Waterworks Company, the Central Electricity Generating Board, the Cheltenham and Gloucester Joint Water Board, the East Shropshire Water Board, the East Worcestershire Waterworks Company, the Montgomeryshire Water Board, the South Staffordshire Waterworks Company, the county council of the administrative county of Montgomery and the Severn River Board, to empower the Clywedog Reservoir Joint Authority to acquire lands, to construct works and to regulate the flow of water in the river Severn; to confer powers upon the constituent authorities of the said Authority; and for other purposes.
415:(c. xxxi), ordering its creation to help prevent flooding of the River Severn in winter and to maintain its water levels in the summer. Local opposition was strong against the construction of the reservoir as it would result in the flooding of much of the Clywedog valley and the drowning of 615 acres (2.5 km) of agricultural land. On top of several disruptions and protests, during construction in 1966 a bomb was detonated within the construction site, setting work back by almost two months. The political extremist group
47:
312:
31:
280:
953:
2496:
54:
2484:
361:
An Act to constitute the
Clywedog Reservoir Joint Authority consisting of representatives of the lord mayors, aldermen and citizens of the cities of Birmingham and Coventry, the mayors, aldermen and burgesses of the boroughs of Shrewsbury and Wolverhampton, the mayor, aldermen and citizens of the
287:
It regulates the flow of water in the River Severn by releasing water into the river channel during low flow periods and re-filling during the wetter winter months. This enables major water abstractions to be made from the River Severn to supply the West
Midlands with 50 million litres
451:
nest platform near the reservoir. The nest has been in use by breeding ospreys since 2014; by the end of 2022, 22 osprey chicks had been raised on the site. A web camera was installed in 2020 enabling video of the nest to be viewed online. A trout fishery operates on the reservoir.
427:
The reservoir was opened in 1967 and has been in continuous usage since then, generally filling with water over the winter months and gradually releasing it during the summer months. The reservoir is currently owned and operated by
288:(11,000,000 imp gal) of drinking water. Capacity is held in the reservoir throughout the winter so that it retains capacity to mitigate downstream flooding by absorbing excess flow from the head-waters of the
642:
372:
251:"At certain times the flow of water in the river is inadequate ... unless that flow were regulated so as to ensure that at those times water in addition to the natural flow will flow down the river."
436:. Clywedog Sailing Club operates on the lake, and Powys County Council's Staylittle Outdoor Centre delivers a range of adventure education both on the water and in the surrounding area.
2418:
443:
turbine. The area around
Clywedog dam is now a popular leisure destination offering scenic walks and wildlife watching. At the base of the dam lies the ruins of the
2448:
2398:
304:
dam in the UK, with a height of 72 metres (236 ft) and a length of 230 metres (750 ft). When at capacity the reservoir contains approximately 50,000
249:. The construction of the reservoir was enabled by an act of Parliament, the Clywedog Reservoir Joint Authority Act 1963 (c. xxxi), which asserted that
260:
Its primary purpose was to regulate the flow in the River Severn to mitigate flooding and provide support for drinking water abstractions for the
101:
663:
367:
725:
46:
769:
2441:
2546:
1107:
2436:
1838:
2428:
2403:
1863:
348:
834:
747:
2551:
2521:
2423:
2468:
1407:
469:
2463:
2268:
1833:
292:, a tributary of the River Severn. The reservoir was formed by damming both the Afon Clywedog and a much smaller
2453:
2413:
2008:
1327:
1242:
982:
494:
Highfield, Jonathon; Hughes, Noel (2 August 2016). "Llyn
Clywedog reservoir – '50 years of reliable service".
2408:
1998:
1387:
1322:
433:
2536:
2531:
2526:
2367:
1938:
1247:
1172:
416:
261:
2458:
1943:
1077:
992:
395:
356:
157:
1858:
1197:
1082:
678:
503:
2316:
2158:
1928:
1232:
887:
827:
700:
311:
30:
2382:
2153:
1958:
1312:
444:
145:
2118:
2357:
2352:
2321:
1758:
1598:
1392:
1207:
1177:
1047:
912:
882:
583:
404:
279:
2541:
2488:
2306:
2276:
2103:
2098:
2093:
511:
432:(the successors to the Clywedog Reservoir Joint Authority) with oversight and regulation by
2336:
2296:
2253:
2213:
2033:
1823:
1738:
1638:
1593:
1487:
1452:
1422:
1347:
1162:
1007:
902:
877:
952:
507:
2372:
2281:
2133:
2003:
1993:
1883:
1728:
1648:
1497:
917:
820:
701:"Clwyd-Powys Archaeological Trust - Projects - Historic Landscapes - Clywedog Valley -"
440:
293:
226:
169:
2515:
2311:
2301:
2286:
1893:
1818:
1783:
1643:
1558:
1512:
1382:
1167:
942:
674:
668:
403:
Construction of the dam started in 1963 and finished in 1967 after the passing of an
289:
133:
2500:
2331:
2258:
2113:
2018:
1898:
1873:
1828:
1768:
1743:
1718:
1713:
1693:
1663:
1533:
1507:
1187:
1157:
1052:
967:
862:
429:
385:
297:
246:
2377:
2326:
2218:
2183:
2178:
2173:
2163:
2108:
2043:
1933:
1918:
1888:
1748:
1608:
1528:
1417:
1362:
1267:
1262:
1252:
1237:
1217:
1152:
1132:
1072:
1067:
907:
867:
794:
608:
557:
2291:
2233:
2193:
2168:
2123:
2088:
2053:
2028:
1978:
1963:
1953:
1948:
1923:
1913:
1868:
1853:
1763:
1673:
1578:
1573:
1568:
1538:
1467:
1457:
1442:
1432:
1412:
1402:
1342:
1307:
1297:
1292:
1282:
1272:
1257:
1222:
1212:
1182:
1147:
1137:
1117:
1102:
1042:
977:
922:
897:
892:
872:
800:
305:
296:
located at Bwlch-y-gle to prevent overflow into the next valley. Its concrete
269:
265:
238:
83:
75:
116:
103:
2228:
2203:
2188:
2083:
2073:
2038:
2013:
1988:
1983:
1973:
1908:
1843:
1788:
1703:
1683:
1653:
1623:
1603:
1583:
1548:
1492:
1337:
1332:
1302:
1287:
1227:
1202:
1142:
1112:
937:
234:
212:
138:
515:
2238:
2208:
2198:
2143:
2138:
2128:
2023:
1968:
1903:
1878:
1848:
1773:
1753:
1708:
1668:
1658:
1628:
1588:
1553:
1543:
1477:
1462:
1447:
1437:
1427:
1317:
1277:
1192:
1122:
1027:
1017:
997:
932:
927:
806:
634:
301:
2243:
2223:
2148:
2058:
2048:
1803:
1798:
1793:
1778:
1723:
1688:
1633:
1618:
1613:
1563:
1482:
1472:
1397:
1372:
1367:
1352:
1127:
1057:
1032:
1002:
972:
532:
146:
158:
2248:
2078:
2068:
2063:
1813:
1808:
1377:
1357:
1097:
1092:
1087:
1022:
1012:
857:
448:
1733:
1698:
1678:
1502:
1062:
1037:
987:
843:
439:
The dam operating plant runs self-sufficiently from a 500 kW
310:
278:
273:
242:
87:
79:
816:
609:"Lake Vyrnwy and Llyn Clywedog flooding fears sparks review"
770:"Angler breaks season record with huge Llyn Clywedog trout"
558:"UK heatwave: How much water does Wales pump to England?"
812:
419:(MAC) was widely suspected of carrying out the bombing.
748:"Osprey webcam set up in Hafren Forest near Llanidloes"
726:"Ospreys Dylan and Seren return to mid Wales forest"
264:. It was completed in 1967 and is situated near the
2391:
2345:
2267:
1521:
960:
850:
394:
384:
379:
366:
355:
329:
207:
199:
191:
183:
179:
168:
156:
144:
132:
93:
71:
23:
94:
447:. In 2005 Natural Resources Wales installed an
828:
8:
527:
525:
471:Clywedog Reservoir Joint Authority Act 1963
411:Clywedog Reservoir Joint Authority Act 1963
331:Clywedog Reservoir Joint Authority Act 1963
835:
821:
813:
664:"Our history – Clywedog Dam, Wales − 1967"
326:
53:
20:
533:"Llyn Clywedog - Llanidloes mid Wales UK"
461:
809:- Llyn Clywedog Trout Fishery website
584:"South Staff Water - Our Supply Area"
396:Text of statute as originally enacted
7:
635:"Clywedog Dam, Llanidloes (305772)"
1108:Forden with Leighton and Trelystan
772:. Powys County Times. 7 April 2021
750:. Powys County Times. 2 April 2020
195:2.5 km (0.97 sq mi)
14:
1864:Heartsease (Llanddewi Ystradenni)
1839:Four Crosses, Llanfair Caereinion
801:Welcome to Lyn Clywedog Reservoir
474:. 1963 c. xxxi, preamble para (6)
2494:
2482:
951:
349:Parliament of the United Kingdom
342:
52:
45:
29:
206:
198:
190:
182:
16:Reservoir in the United Kingdom
728:. Cambrian News. 29 March 2023
1:
1834:Four Crosses, Montgomeryshire
70:
2449:Registered parks and gardens
2399:Parliamentary constituencies
588:www.south-staffs-water.co.uk
315:Below Clywedog Reservoir dam
807:Llyn Clywedog Trout Fishery
2568:
1408:Newtown and Llanllwchaiarn
324:United Kingdom legislation
245:on the head-waters of the
2547:River regulation in Powys
2477:
949:
341:
336:
187:9.5 km (5.9 mi)
40:
28:
2009:Llansanffraid-ym-Mechain
983:Abermule with Llandyssil
1999:Llanrhaeadr-ym-Mochnant
1388:Mochdre with Penstrowed
1323:Llanrhaeadr-ym-Mochnant
803:– BirminghamUK archives
537:Llanidloes Town Council
434:Natural Resources Wales
203:66 m (217 ft)
2368:Elan Valley Reservoirs
1939:Llanfihangel Nant Bran
1248:Llanfihangel Rhydithon
677:. 2011. Archived from
516:10.1680/jdare.16.00035
417:Mudiad Amddiffyn Cymru
316:
284:
230:
2552:Severn drainage basin
1944:Llanfihangel Talyllyn
1859:Heartsease (Knighton)
993:Bausley with Criggion
851:Principal settlements
314:
282:
215:(41,000 acre⋅ft)
2346:Reservoirs and lakes
1198:Llanddewi Ystradenny
1083:Disserth and Trecoed
797:– Llanidloes website
117:52.48611°N 3.62500°W
2522:Reservoirs in Powys
2424:Scheduled Monuments
1929:Llanfair Caereinion
1233:Llanfair Caereinion
888:Llanfair Caereinion
681:on 30 December 2011
508:2016DamRe..26...63H
496:Dams and Reservoirs
113: /
2383:Talybont Reservoir
2363:Clywedog Reservoir
1959:Llangammarch Wells
1522:Towns and villages
1313:Llanidloes Without
1078:Cwmdu and District
445:Bryntail lead mine
317:
285:
223:Clywedog Reservoir
122:52.48611; -3.62500
60:Clywedog Reservoir
35:Clywedog Reservoir
24:Clywedog Reservoir
2509:
2508:
2433:Listed buildings
2358:Cantref Reservoir
2353:Beacons Reservoir
2322:Montgomery Castle
1208:Llandrindod Wells
1178:Llanbadarn Fynydd
1048:Castle Caereinion
883:Llandrindod Wells
675:Halcrow Group Ltd
405:act of Parliament
401:
400:
337:Act of Parliament
219:
218:
2559:
2499:
2498:
2497:
2487:
2486:
2485:
2454:Lord Lieutenants
2307:Dolforwyn Castle
2277:Aberysgir Castle
2104:Old Church Stoke
2094:Newbridge-on-Wye
955:
837:
830:
823:
814:
782:
781:
779:
777:
766:
760:
759:
757:
755:
744:
738:
737:
735:
733:
722:
716:
715:
713:
711:
697:
691:
690:
688:
686:
660:
654:
653:
651:
649:
631:
625:
624:
622:
620:
605:
599:
598:
596:
594:
580:
574:
573:
571:
569:
554:
548:
547:
545:
543:
529:
520:
519:
491:
485:
483:
481:
479:
466:
413:
412:
346:
345:
332:
327:
283:The lake at dusk
160:
159:Primary outflows
148:
128:
127:
125:
124:
123:
118:
114:
111:
110:
109:
106:
96:
56:
55:
49:
33:
21:
2567:
2566:
2562:
2561:
2560:
2558:
2557:
2556:
2512:
2511:
2510:
2505:
2495:
2493:
2483:
2481:
2473:
2404:Electoral wards
2387:
2341:
2337:Tretower Castle
2297:Cefnllys Castle
2263:
2254:Van, Llanidloes
2214:Talybont-on-Usk
2034:Llanwrtyd Wells
1639:Bettws Cedewain
1517:
1488:Vale of Grwyney
1453:Talybont-on-Usk
1423:Pen-y-bont-fawr
1348:Llanwrtyd Wells
1173:Llanbadarn Fawr
956:
947:
903:Llanwrtyd Wells
846:
841:
791:
786:
785:
775:
773:
768:
767:
763:
753:
751:
746:
745:
741:
731:
729:
724:
723:
719:
709:
707:
705:www.cpat.org.uk
699:
698:
694:
684:
682:
662:
661:
657:
647:
645:
633:
632:
628:
618:
616:
615:. 12 March 2014
607:
606:
602:
592:
590:
582:
581:
577:
567:
565:
556:
555:
551:
541:
539:
531:
530:
523:
493:
492:
488:
477:
475:
468:
467:
463:
458:
425:
410:
409:
351:
343:
330:
325:
322:
300:is the tallest
258:
172: countries
147:Primary inflows
121:
119:
115:
112:
107:
104:
102:
100:
99:
82:
67:
66:
65:
64:
63:
62:
61:
57:
36:
17:
12:
11:
5:
2565:
2563:
2555:
2554:
2549:
2544:
2539:
2534:
2529:
2524:
2514:
2513:
2507:
2506:
2504:
2503:
2491:
2478:
2475:
2474:
2472:
2471:
2466:
2461:
2456:
2451:
2446:
2445:
2444:
2439:
2431:
2429:Country houses
2426:
2421:
2416:
2411:
2406:
2401:
2395:
2393:
2389:
2388:
2386:
2385:
2380:
2375:
2373:Llangorse Lake
2370:
2365:
2360:
2355:
2349:
2347:
2343:
2342:
2340:
2339:
2334:
2329:
2324:
2319:
2314:
2309:
2304:
2299:
2294:
2289:
2284:
2282:Aberedw Castle
2279:
2273:
2271:
2265:
2264:
2262:
2261:
2256:
2251:
2246:
2241:
2236:
2231:
2226:
2221:
2216:
2211:
2206:
2201:
2196:
2191:
2186:
2181:
2176:
2171:
2166:
2161:
2156:
2151:
2146:
2141:
2136:
2131:
2126:
2121:
2116:
2111:
2106:
2101:
2096:
2091:
2086:
2081:
2076:
2071:
2066:
2061:
2056:
2051:
2046:
2041:
2036:
2031:
2026:
2021:
2016:
2011:
2006:
2004:Llansantffraed
2001:
1996:
1994:Llanllwchaiarn
1991:
1986:
1981:
1976:
1971:
1966:
1961:
1956:
1951:
1946:
1941:
1936:
1931:
1926:
1921:
1916:
1911:
1906:
1901:
1896:
1891:
1886:
1881:
1876:
1871:
1866:
1861:
1856:
1851:
1846:
1841:
1836:
1831:
1826:
1821:
1816:
1811:
1806:
1801:
1796:
1791:
1786:
1781:
1776:
1771:
1766:
1761:
1756:
1751:
1746:
1741:
1736:
1731:
1726:
1721:
1716:
1711:
1706:
1701:
1696:
1691:
1686:
1681:
1676:
1671:
1666:
1661:
1656:
1651:
1649:Bont Dolgadfan
1646:
1641:
1636:
1631:
1626:
1621:
1616:
1611:
1606:
1601:
1596:
1591:
1586:
1581:
1576:
1571:
1566:
1561:
1556:
1551:
1546:
1541:
1536:
1531:
1525:
1523:
1519:
1518:
1516:
1515:
1510:
1505:
1500:
1495:
1490:
1485:
1480:
1475:
1470:
1465:
1460:
1455:
1450:
1445:
1440:
1435:
1430:
1425:
1420:
1415:
1410:
1405:
1400:
1395:
1390:
1385:
1380:
1375:
1370:
1365:
1360:
1355:
1350:
1345:
1340:
1335:
1330:
1328:Llansantffraid
1325:
1320:
1315:
1310:
1305:
1300:
1295:
1290:
1285:
1280:
1275:
1270:
1265:
1260:
1255:
1250:
1245:
1240:
1235:
1230:
1225:
1220:
1215:
1210:
1205:
1200:
1195:
1190:
1185:
1180:
1175:
1170:
1165:
1160:
1155:
1150:
1145:
1140:
1135:
1130:
1125:
1120:
1115:
1110:
1105:
1100:
1095:
1090:
1085:
1080:
1075:
1070:
1065:
1060:
1055:
1050:
1045:
1040:
1035:
1030:
1025:
1020:
1015:
1010:
1005:
1000:
995:
990:
985:
980:
975:
970:
964:
962:
958:
957:
950:
948:
946:
945:
940:
935:
930:
925:
920:
915:
910:
905:
900:
895:
890:
885:
880:
875:
870:
865:
860:
854:
852:
848:
847:
842:
840:
839:
832:
825:
817:
811:
810:
804:
798:
790:
789:External links
787:
784:
783:
761:
739:
717:
692:
655:
626:
600:
575:
564:. 28 July 2018
549:
521:
486:
460:
459:
457:
454:
441:hydro-electric
424:
421:
399:
398:
392:
391:
388:
382:
381:
377:
376:
370:
364:
363:
359:
353:
352:
347:
339:
338:
334:
333:
323:
321:
318:
294:embankment dam
257:
254:
217:
216:
209:
205:
204:
201:
197:
196:
193:
189:
188:
185:
181:
180:
177:
176:
173:
166:
165:
162:
154:
153:
150:
142:
141:
136:
130:
129:
97:
91:
90:
73:
69:
68:
59:
58:
51:
50:
44:
43:
42:
41:
38:
37:
34:
26:
25:
15:
13:
10:
9:
6:
4:
3:
2:
2564:
2553:
2550:
2548:
2545:
2543:
2540:
2538:
2537:Buttress dams
2535:
2533:
2532:Dams in Powys
2530:
2528:
2527:Dams in Wales
2525:
2523:
2520:
2519:
2517:
2502:
2492:
2490:
2480:
2479:
2476:
2470:
2467:
2465:
2462:
2460:
2459:High Sheriffs
2457:
2455:
2452:
2450:
2447:
2443:
2440:
2438:
2435:
2434:
2432:
2430:
2427:
2425:
2422:
2420:
2417:
2415:
2412:
2410:
2407:
2405:
2402:
2400:
2397:
2396:
2394:
2390:
2384:
2381:
2379:
2376:
2374:
2371:
2369:
2366:
2364:
2361:
2359:
2356:
2354:
2351:
2350:
2348:
2344:
2338:
2335:
2333:
2330:
2328:
2325:
2323:
2320:
2318:
2315:
2313:
2312:Llangoed Hall
2310:
2308:
2305:
2303:
2302:Colwyn Castle
2300:
2298:
2295:
2293:
2290:
2288:
2287:Castell Dinas
2285:
2283:
2280:
2278:
2275:
2274:
2272:
2270:
2266:
2260:
2257:
2255:
2252:
2250:
2247:
2245:
2242:
2240:
2237:
2235:
2232:
2230:
2227:
2225:
2222:
2220:
2217:
2215:
2212:
2210:
2207:
2205:
2202:
2200:
2197:
2195:
2192:
2190:
2187:
2185:
2182:
2180:
2177:
2175:
2172:
2170:
2167:
2165:
2162:
2160:
2159:Pont Crugnant
2157:
2155:
2152:
2150:
2147:
2145:
2142:
2140:
2137:
2135:
2132:
2130:
2127:
2125:
2122:
2120:
2117:
2115:
2112:
2110:
2107:
2105:
2102:
2100:
2097:
2095:
2092:
2090:
2087:
2085:
2082:
2080:
2077:
2075:
2072:
2070:
2067:
2065:
2062:
2060:
2057:
2055:
2052:
2050:
2047:
2045:
2042:
2040:
2037:
2035:
2032:
2030:
2027:
2025:
2022:
2020:
2017:
2015:
2012:
2010:
2007:
2005:
2002:
2000:
1997:
1995:
1992:
1990:
1987:
1985:
1982:
1980:
1977:
1975:
1972:
1970:
1967:
1965:
1962:
1960:
1957:
1955:
1952:
1950:
1947:
1945:
1942:
1940:
1937:
1935:
1932:
1930:
1927:
1925:
1922:
1920:
1917:
1915:
1912:
1910:
1907:
1905:
1902:
1900:
1897:
1895:
1894:Llanafan Fawr
1892:
1890:
1887:
1885:
1882:
1880:
1877:
1875:
1872:
1870:
1867:
1865:
1862:
1860:
1857:
1855:
1852:
1850:
1847:
1845:
1842:
1840:
1837:
1835:
1832:
1830:
1827:
1825:
1822:
1820:
1819:Esgairgeiliog
1817:
1815:
1812:
1810:
1807:
1805:
1802:
1800:
1797:
1795:
1792:
1790:
1787:
1785:
1784:Cwrt-y-Gollen
1782:
1780:
1777:
1775:
1772:
1770:
1767:
1765:
1762:
1760:
1757:
1755:
1752:
1750:
1747:
1745:
1742:
1740:
1737:
1735:
1732:
1730:
1727:
1725:
1722:
1720:
1717:
1715:
1712:
1710:
1707:
1705:
1702:
1700:
1697:
1695:
1692:
1690:
1687:
1685:
1682:
1680:
1677:
1675:
1672:
1670:
1667:
1665:
1662:
1660:
1657:
1655:
1652:
1650:
1647:
1645:
1642:
1640:
1637:
1635:
1632:
1630:
1627:
1625:
1622:
1620:
1617:
1615:
1612:
1610:
1607:
1605:
1602:
1600:
1597:
1595:
1592:
1590:
1587:
1585:
1582:
1580:
1577:
1575:
1572:
1570:
1567:
1565:
1562:
1560:
1559:Abercynllaith
1557:
1555:
1552:
1550:
1547:
1545:
1542:
1540:
1537:
1535:
1532:
1530:
1527:
1526:
1524:
1520:
1514:
1513:Ystradgynlais
1511:
1509:
1506:
1504:
1501:
1499:
1496:
1494:
1491:
1489:
1486:
1484:
1481:
1479:
1476:
1474:
1471:
1469:
1466:
1464:
1461:
1459:
1456:
1454:
1451:
1449:
1446:
1444:
1441:
1439:
1436:
1434:
1431:
1429:
1426:
1424:
1421:
1419:
1416:
1414:
1411:
1409:
1406:
1404:
1401:
1399:
1396:
1394:
1391:
1389:
1386:
1384:
1383:Merthyr Cynog
1381:
1379:
1376:
1374:
1371:
1369:
1366:
1364:
1361:
1359:
1356:
1354:
1351:
1349:
1346:
1344:
1341:
1339:
1336:
1334:
1331:
1329:
1326:
1324:
1321:
1319:
1316:
1314:
1311:
1309:
1306:
1304:
1301:
1299:
1296:
1294:
1291:
1289:
1286:
1284:
1281:
1279:
1276:
1274:
1271:
1269:
1266:
1264:
1261:
1259:
1256:
1254:
1251:
1249:
1246:
1244:
1241:
1239:
1236:
1234:
1231:
1229:
1226:
1224:
1221:
1219:
1216:
1214:
1211:
1209:
1206:
1204:
1201:
1199:
1196:
1194:
1191:
1189:
1186:
1184:
1181:
1179:
1176:
1174:
1171:
1169:
1168:Llanafan Fawr
1166:
1164:
1161:
1159:
1156:
1154:
1151:
1149:
1146:
1144:
1141:
1139:
1136:
1134:
1131:
1129:
1126:
1124:
1121:
1119:
1116:
1114:
1111:
1109:
1106:
1104:
1101:
1099:
1096:
1094:
1091:
1089:
1086:
1084:
1081:
1079:
1076:
1074:
1071:
1069:
1066:
1064:
1061:
1059:
1056:
1054:
1051:
1049:
1046:
1044:
1041:
1039:
1036:
1034:
1031:
1029:
1026:
1024:
1021:
1019:
1016:
1014:
1011:
1009:
1006:
1004:
1001:
999:
996:
994:
991:
989:
986:
984:
981:
979:
976:
974:
971:
969:
966:
965:
963:
959:
954:
944:
943:Ystradgynlais
941:
939:
936:
934:
931:
929:
926:
924:
921:
919:
916:
914:
911:
909:
906:
904:
901:
899:
896:
894:
891:
889:
886:
884:
881:
879:
876:
874:
871:
869:
866:
864:
861:
859:
856:
855:
853:
849:
845:
838:
833:
831:
826:
824:
819:
818:
815:
808:
805:
802:
799:
796:
795:Llyn Clywedog
793:
792:
788:
771:
765:
762:
749:
743:
740:
727:
721:
718:
706:
702:
696:
693:
680:
676:
672:
670:
669:Halcrow Group
665:
659:
656:
644:
640:
636:
630:
627:
614:
610:
604:
601:
589:
585:
579:
576:
563:
559:
553:
550:
538:
534:
528:
526:
522:
517:
513:
509:
505:
501:
497:
490:
487:
473:
472:
465:
462:
455:
453:
450:
446:
442:
437:
435:
431:
422:
420:
418:
414:
406:
397:
393:
389:
387:
383:
378:
374:
371:
369:
365:
360:
358:
354:
350:
340:
335:
328:
319:
313:
309:
307:
303:
299:
295:
291:
290:Afon Clywedog
281:
277:
275:
271:
267:
263:
262:West Midlands
255:
253:
252:
248:
244:
240:
236:
232:
231:Llyn Clywedog
228:
224:
214:
210:
202:
194:
186:
178:
174:
171:
167:
164:Afon Clywedog
163:
161:
155:
152:Afon Clywedog
151:
149:
143:
140:
137:
135:
131:
126:
98:
92:
89:
85:
81:
77:
74:
48:
39:
32:
27:
22:
19:
2362:
2332:Powis Castle
2259:Ystradfellte
2019:Llanwchaiarn
1899:Llanbrynmair
1744:Commins Coch
1719:Church Stoke
1714:Cemmaes Road
1694:Capel-y-ffin
1664:Builth Wells
1534:Aber Clydach
1508:Ystradfellte
1243:Llanfihangel
1188:Llanbrynmair
968:Abbey Cwmhir
863:Builth Wells
774:. Retrieved
764:
752:. Retrieved
742:
730:. Retrieved
720:
708:. Retrieved
704:
695:
683:. Retrieved
679:the original
667:
658:
646:. Retrieved
638:
629:
617:. Retrieved
612:
603:
591:. Retrieved
587:
578:
566:. Retrieved
561:
552:
540:. Retrieved
536:
502:(2): 63–64.
499:
495:
489:
476:. Retrieved
470:
464:
438:
430:Severn Trent
426:
408:
402:
390:31 July 1963
386:Royal assent
320:Construction
298:buttress dam
286:
259:
250:
247:River Severn
222:
220:
208:Water volume
192:Surface area
18:
2378:Lake Vyrnwy
2327:Painscastle
2219:Three Cocks
2179:Sennybridge
2164:Pontdolgoch
2154:Plas Esgair
2109:Painscastle
2044:Llanymynech
1934:Llanfechain
1919:Llandysilio
1749:Crickhowell
1529:Abbeycwmhir
1418:Painscastle
1363:Machynlleth
1268:Llangattock
1263:Llangamarch
1253:Llanfrynach
1238:Llanfechain
1218:Llandysilio
1153:Honddu Isaf
1133:Glyn Tarell
1073:Crickhowell
1053:Churchstoke
961:Communities
908:Machynlleth
868:Crickhowell
732:17 February
184:Max. length
120: /
95:Coordinates
2516:Categories
2469:Public art
2317:Mediomanum
2292:Castell Du
2234:Trefeglwys
2194:Staylittle
2169:Pontrobert
2124:Partrishow
2119:Pant-y-Dwr
2089:New Radnor
2054:Llawryglyn
2029:Llanwrthwl
1979:Llangynidr
1964:Llangedwyn
1954:Llangadfan
1949:Llanfyllin
1924:Llanelwedd
1914:Llandrinio
1869:Heol Senni
1854:Hay-on-Wye
1764:Cwmdauddwr
1759:Crossgates
1674:Buttington
1599:Abertridwr
1579:Aberhafesp
1574:Abergwydol
1569:Abergwesyn
1539:Aberbechan
1468:Trefeglwys
1458:Tawe-Uchaf
1433:Presteigne
1413:Old Radnor
1403:New Radnor
1393:Montgomery
1343:Llanwrthwl
1308:Llanidloes
1298:Llangyniew
1293:Llangynidr
1283:Llangunllo
1273:Llangedwyn
1258:Llanfyllin
1223:Llanelwedd
1213:Llandrinio
1183:Llanbister
1138:Guilsfield
1118:Glantwymyn
1103:Felin-fach
1043:Carreghofa
978:Aberhafesp
923:Presteigne
913:Montgomery
898:Llanidloes
893:Llanfyllin
873:Hay-on-Wye
542:1 December
456:References
357:Long title
308:of water.
306:megalitres
270:Llanidloes
266:B4518 road
239:Llanidloes
213:megalitres
200:Max. depth
105:52°29′10″N
84:Trefeglwys
76:Llanidloes
2489:Geography
2442:Grade II*
2229:Trecastle
2204:Talerddig
2189:St Harmon
2099:Newchurch
2084:Nant Glas
2074:Milebrook
2039:Llanwrtyd
2014:Llansilin
1989:Llangynyw
1984:Llangynog
1974:Llangurig
1909:Llandinam
1844:Gladestry
1789:Derwenlas
1704:Cathedine
1684:Caehopkin
1654:Boughrood
1624:Bacheldre
1604:Aberyscir
1584:Aberhosan
1549:Abercegir
1493:Welshpool
1443:St Harmon
1338:Llanwddyn
1333:Llansilin
1303:Llangynog
1288:Llangurig
1228:Llanerfyl
1203:Llandinam
1143:Gwernyfed
1113:Gladestry
938:Welshpool
776:31 August
685:8 January
423:Operation
268:north of
235:reservoir
139:reservoir
108:3°37′30″W
2239:Tregynon
2209:Talgarth
2199:Sycharth
2144:Penybont
2139:Penwyllt
2129:Penegoes
2024:Llanwrin
1969:Llangors
1904:Llanddew
1879:Knucklas
1849:Glasbury
1824:Felindre
1774:Cwmtwrch
1754:Criggion
1739:Coelbren
1709:Cefnllys
1669:Burgedin
1659:Bronllys
1629:Beguildy
1594:Abernant
1589:Abermule
1554:Abercraf
1544:Aberbran
1478:Tregynon
1463:Trallong
1448:Talgarth
1438:Rhayader
1428:Penybont
1318:Llanigon
1278:Llangors
1193:Llanddew
1163:Knighton
1123:Glasbury
1028:Cadfarch
1018:Bronllys
998:Beguildy
933:Talgarth
928:Rhayader
878:Knighton
710:9 August
648:17 March
368:Citation
302:concrete
72:Location
2542:Elenydd
2464:Museums
2437:Grade I
2414:Schools
2269:Castles
2244:Trewern
2224:Tirabad
2149:Pilleth
2134:Pennant
2059:Llyswen
2049:Llanyre
1884:Libanus
1804:Dolyhir
1799:Dolfach
1794:Dolanog
1779:Cwmwysg
1729:Clatter
1724:Cilmery
1689:Caersws
1634:Berriew
1619:Arddlin
1614:Aithnen
1564:Aberedw
1498:Whitton
1483:Trewern
1473:Treflys
1398:Nantmel
1373:Manafon
1368:Maescar
1353:Llanyre
1128:Glascwm
1058:Cilmery
1033:Caersws
1003:Berriew
973:Aberedw
918:Newtown
754:12 June
671:website
639:Coflein
619:11 June
593:11 June
568:11 June
504:Bibcode
478:11 June
375:c. xxxi
256:Purpose
233:) is a
211:50,000
2409:Places
2392:Topics
2249:Tylwch
2079:Morben
2069:Meifod
2064:Llywel
1814:Erwood
1809:Dylife
1644:Beulah
1378:Meifod
1358:Llywel
1098:Erwood
1093:Dwyriw
1088:Duhonw
1023:Builth
1013:Brecon
1008:Bettws
858:Brecon
643:RCAHMW
449:osprey
407:, the
2501:Wales
2419:SSSIs
2114:Pandy
1874:Kerry
1829:Forge
1769:Cwmdu
1734:Clyro
1699:Carno
1679:Bwlch
1503:Yscir
1158:Kerry
1063:Clyro
1038:Carno
988:Banwy
844:Powys
380:Dates
274:Powys
243:Wales
237:near
227:Welsh
175:Wales
170:Basin
88:Powys
80:Powys
2184:Soar
2174:Sarn
1889:Llan
1609:Adfa
1068:Cray
778:2022
756:2020
734:2024
712:2021
687:2012
650:2018
621:2022
595:2022
570:2022
544:2020
480:2022
373:1963
221:The
134:Type
1148:Hay
613:BBC
562:BBC
512:doi
2518::
703:.
673:.
666:.
641:.
637:.
611:.
586:.
560:.
535:.
524:^
510:.
500:26
498:.
276:.
272:,
241:,
229::
86:,
78:,
836:e
829:t
822:v
780:.
758:.
736:.
714:.
689:.
652:.
623:.
597:.
572:.
546:.
518:.
514::
506::
484:.
482:.
225:(
Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
