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River Dwyryd

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690: 218:. Prior to construction of the dam in the 1920s for hydroelectric power, the river had wandered across a broad upland marsh here known as Cors Goch. It is the only inland water in the UK that has been used as a source of cooling water for a nuclear power station. The Afon Prysor resumes its course below the dam, to flow down to the Dwyryd through the steeply wooded valley of Ceunant Llennyrch which is at the core of a 1822: 22: 1810: 234:
At no point is the river deep enough to accommodate sea-going ships, but in the second half of the 18th century a number of quays were constructed west of Maentwrog from which small vessels took cargoes of timber and, increasingly, slate to be transferred to sea-going ships in deeper water southwest
82:. At Rhyd-y-Sarn, the Afon Goedol is joined by the Afon Teigl (originating from Manod Mawr). Thereafter, the river is called the Afon Dwyryd. Below Rhyd y Sarn by Pont Dolymoch, the river is joined by the Afon Cynfal which flows from the east down a deep wooded 182:. Much of the catchment has also been used for commercial forestry during the last hundred years. As a consequence, many of the tributaries are highly acidic as a result of atmospheric 155:. The Afon y Glyn which drains the southwest catchment from Llyn Tecwyn Uchaf and Llyn Tecwyn Isaf enters the southern side of the Glaslyn estuary at the south end of a large extent of 1744: 190:
in many tributaries. Some of these problems have been exacerbated by past industrial activities including metal mining, slate mining, animal skin processing and the use by the
540: 1769: 264:"View map: One-inch Revised New Series, England and Wales: Sheet 135 - Harlech (Outline) - Ordnance Survey One-Inch to the mile, England and Wales, Revised New Series" 1724: 78: 239:, transferring to Porthmadog itself when its harbour was opened in 1824. The river was and remains so shallow that viable cargoes could only be carried at 219: 206:
is the largest tributary of the Dwyryd, entering its left bank in the tidal section downstream of Maentwrog. It rises in the hills to the east of
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about one mile (1.6 km) further downstream. This tributary rises south of Gellilydan and just north of the reservoir of
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drains into Llyn Ystradau, the outflow of which forms the source of the Afon Goedol. This is joined by the River Bowydd at
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Nutrient status of the Glaslyn/Dwyryd, Mawddach and Dyfi estuaries : its context and ecological importance
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which also drain south into the river. These lakes include Llyn y Garnedd, Llyn Hafod y Llyn and
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Glaslyn/Dwyrd/Artro catchment management plan : Consultation report : May 1995
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in 1836 dealt a mortal blow to the Dwyryd traffic, which ended completely by 1860.
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close to Maentwrog; the flow then re-joins the Prysor just before the confluence.
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There are a number of small lakes and reservoirs in the woodlands north of
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of a gunnery range with large amounts of emplaced metal cartridge shells.
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McElvogue, D. M. (2003). "Cwch Talsarnau: a boat from the Afon Dwyryd".
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Survey of macroinvertebrate populations in the Glaslyn/Dwyryd estuary
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The whole of the river drains off igneous and ancient rocks of the
1479: 969: 679: 664: 110:, has much agriculture but is subject to routine winter flooding. 83: 20: 222:. Most of the flow from the reservoir is channelled through the 573: 321:
Sails on the Dwyryd, The River Transport of Ffestiniog Slate
94:. The main river then flows through a wide valley formed by 569: 186:. This has constrained the quality of the fishery and the 210:
and flows past the southern end of the village to enter
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The river on navigable OS maps with satellite overlays
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which includes the spectacular Rhaeadr Cynfal (Cynfal
1717: 1686: 1590: 1549: 1513: 697: 607: 121:but does not receive any water from the reservoir. 68:. At its most northern extent, water draining from 497:Welsh Region, National Rivers Authority (1995). 476:Two Snowdonia rivers : Glaslyn & Dwyryd 163:) on its south bank and opposite the village of 64:The Dwyryd rises in the hills to the north of 585: 143:, flowing under the road and railway line at 8: 449:Parr, W.; Wheeler, M.; Codling, I. (1999). 426:Sedimentary processes in the Dwyryd estuary 592: 578: 570: 474:Richards, Alun John; Napier, Jean (2008). 139:the Dwyryd becomes a long and sandy tidal 344:The Vale of Ffestiniog and its Hinterland 147:, before joining with the estuary of the 327:: Snowdonia National Park Study Centre. 255: 290: 302: 98:, with a broad flat base formed from 7: 1115:Llanfihangel-y-Pennant, Dolbenmaen 14: 434:University College of North Wales 384:University College of North Wales 374:Cook, W.; Rees, E. I. S. (1978). 214:, a large reservoir close to the 1820: 1808: 688: 113:The Afon Tafarn-helyg has its 1: 459:Countryside Council for Wales 1770:Registered parks and gardens 1725:Parliamentary constituencies 533:National Library of Scotland 224:hydro-electric power station 411:: Gwynedd Archives: 41–49. 277:Slate traffic on the Dwyryd 1869: 1440:Tal-y-bont (near Barmouth) 1803: 686: 507:National Rivers Authority 1435:Tal-y-bont (near Bangor) 1105:Llanfihangel Bachellaeth 424:Mahamod, Yusuff (1989). 342:Senior, Michael (2013). 104:riverine gravel deposits 482:: Gwasg Carreg Gwalch. 350:: Gwasg Carreg Gwalch. 220:national nature reserve 151:and then entering into 18:River in Gwynedd, Wales 1709:Saint Tudwal's Islands 1110:Llanfihangel-y-Pennant 319:Lewis, M.J.T. (1989). 41: 29: 608:Principal settlements 235:of what would become 159:known as Glastraeth ( 24: 1531:Coleg Meirion-Dwyfor 556:52.97562°N 3.94496°W 25:The River Dwyryd at 1853:Rivers of Snowdonia 552: /  698:Towns and villages 635:Blaenau Ffestiniog 561:52.97562; -3.94496 245:Ffestiniog Railway 108:Vale of Ffestiniog 106:. The valley, the 30: 1848:Rivers of Gwynedd 1835: 1834: 1754:Listed buildings 1557:Caernarfon Castle 1550:Castles and forts 1521:Bangor University 489:978-0-9512373-3-5 357:978-0-8452-7225-1 334:978-1-84527-206-7 44:), is a river in 1860: 1825: 1824: 1823: 1813: 1812: 1811: 1780:Lord Lieutenants 1704:Ynys Gwylan-fawr 1572:Dolbadarn Castle 1567:Criccieth Castle 1320:Penrhyndeudraeth 1240:Mynydd Llandygai 692: 594: 587: 580: 571: 567: 566: 564: 563: 562: 557: 553: 550: 549: 548: 545: 518: 493: 470: 445: 420: 395: 367:Further material 361: 338: 325:Plas Tan y Bwlch 306: 300: 294: 288: 282: 274: 268: 267: 260: 212:Llyn Trawsfynydd 126:Plas Tan y Bwlch 119:Llyn Trawsfynydd 100:glacial moraines 81: 1868: 1867: 1863: 1862: 1861: 1859: 1858: 1857: 1838: 1837: 1836: 1831: 1821: 1819: 1809: 1807: 1799: 1713: 1682: 1618:Afon Cwmnantcol 1586: 1545: 1509: 1415:Sarn Meyllteyrn 1325:Pentre Gwynfryn 1010:Llan Ffestiniog 693: 684: 603: 598: 560: 558: 554: 551: 546: 543: 541: 539: 538: 526: 521: 496: 490: 473: 448: 423: 398: 373: 369: 364: 358: 341: 335: 318: 314: 309: 301: 297: 289: 285: 275: 271: 262: 261: 257: 253: 232: 200: 77: 62: 19: 12: 11: 5: 1866: 1864: 1856: 1855: 1850: 1840: 1839: 1833: 1832: 1830: 1829: 1817: 1804: 1801: 1800: 1798: 1797: 1792: 1787: 1782: 1777: 1772: 1767: 1766: 1765: 1760: 1752: 1750:Country houses 1747: 1742: 1737: 1732: 1727: 1721: 1719: 1715: 1714: 1712: 1711: 1706: 1701: 1696: 1694:Bardsey Island 1690: 1688: 1684: 1683: 1681: 1680: 1675: 1670: 1668:Afon Rhythallt 1665: 1660: 1655: 1650: 1645: 1640: 1635: 1630: 1625: 1620: 1615: 1610: 1605: 1600: 1594: 1592: 1588: 1587: 1585: 1584: 1579: 1577:Harlech Castle 1574: 1569: 1564: 1562:Castell y Bere 1559: 1553: 1551: 1547: 1546: 1544: 1543: 1538: 1533: 1528: 1523: 1517: 1515: 1511: 1510: 1508: 1507: 1502: 1497: 1492: 1487: 1482: 1477: 1472: 1467: 1462: 1457: 1452: 1447: 1442: 1437: 1432: 1427: 1422: 1417: 1412: 1407: 1402: 1397: 1392: 1387: 1382: 1377: 1372: 1370:Rhos-y-gwaliau 1367: 1362: 1357: 1352: 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494: 488: 471: 446: 421: 401:Maritime Wales 396: 370: 368: 365: 363: 362: 356: 339: 333: 315: 313: 310: 308: 307: 295: 283: 269: 254: 252: 249: 231: 228: 199: 196: 178:which are all 153:Porthmadog Bay 74:grid reference 61: 58: 17: 13: 10: 9: 6: 4: 3: 2: 1865: 1854: 1851: 1849: 1846: 1845: 1843: 1828: 1818: 1816: 1806: 1805: 1802: 1796: 1793: 1791: 1788: 1786: 1785:High Sheriffs 1783: 1781: 1778: 1776: 1773: 1771: 1768: 1764: 1761: 1759: 1756: 1755: 1753: 1751: 1748: 1746: 1743: 1741: 1738: 1736: 1733: 1731: 1728: 1726: 1723: 1722: 1720: 1716: 1710: 1707: 1705: 1702: 1700: 1697: 1695: 1692: 1691: 1689: 1685: 1679: 1678:Afon Tryweryn 1676: 1674: 1671: 1669: 1666: 1664: 1661: 1659: 1658:Afon Mawddach 1656: 1654: 1651: 1649: 1646: 1644: 1641: 1639: 1636: 1634: 1631: 1629: 1626: 1624: 1621: 1619: 1616: 1614: 1611: 1609: 1606: 1604: 1601: 1599: 1596: 1595: 1593: 1589: 1583: 1580: 1578: 1575: 1573: 1570: 1568: 1565: 1563: 1560: 1558: 1555: 1554: 1552: 1548: 1542: 1539: 1537: 1534: 1532: 1529: 1527: 1526:Coleg Harlech 1524: 1522: 1519: 1518: 1516: 1512: 1506: 1503: 1501: 1498: 1496: 1493: 1491: 1488: 1486: 1483: 1481: 1478: 1476: 1473: 1471: 1468: 1466: 1463: 1461: 1458: 1456: 1453: 1451: 1448: 1446: 1443: 1441: 1438: 1436: 1433: 1431: 1428: 1426: 1423: 1421: 1418: 1416: 1413: 1411: 1408: 1406: 1403: 1401: 1398: 1396: 1393: 1391: 1388: 1386: 1383: 1381: 1378: 1376: 1373: 1371: 1368: 1366: 1363: 1361: 1358: 1356: 1353: 1351: 1348: 1346: 1345:Porthdinllaen 1343: 1341: 1338: 1336: 1333: 1331: 1328: 1326: 1323: 1321: 1318: 1316: 1313: 1311: 1308: 1306: 1303: 1301: 1298: 1296: 1293: 1291: 1290:Penisa'r Waun 1288: 1286: 1283: 1281: 1278: 1276: 1273: 1271: 1268: 1266: 1263: 1261: 1258: 1256: 1253: 1251: 1248: 1246: 1243: 1241: 1238: 1236: 1233: 1231: 1228: 1226: 1223: 1221: 1218: 1216: 1213: 1211: 1208: 1206: 1203: 1201: 1198: 1196: 1193: 1191: 1188: 1186: 1183: 1181: 1178: 1176: 1173: 1171: 1168: 1166: 1163: 1161: 1158: 1156: 1153: 1151: 1148: 1146: 1143: 1141: 1138: 1136: 1133: 1131: 1128: 1126: 1123: 1121: 1118: 1116: 1113: 1111: 1108: 1106: 1103: 1101: 1098: 1096: 1093: 1091: 1088: 1086: 1083: 1081: 1078: 1076: 1073: 1071: 1068: 1066: 1063: 1061: 1058: 1056: 1053: 1051: 1048: 1046: 1043: 1041: 1038: 1036: 1033: 1031: 1028: 1026: 1023: 1021: 1020:Llanaelhaearn 1018: 1016: 1013: 1011: 1008: 1006: 1003: 1001: 998: 996: 993: 991: 988: 986: 983: 981: 978: 976: 973: 971: 968: 966: 963: 961: 958: 956: 953: 951: 948: 946: 943: 941: 938: 936: 933: 931: 928: 926: 925:Dinas Mawddwy 923: 921: 918: 916: 913: 911: 908: 906: 903: 901: 898: 896: 893: 891: 888: 886: 883: 881: 878: 876: 873: 871: 868: 866: 863: 861: 858: 856: 853: 851: 848: 846: 843: 841: 838: 836: 833: 831: 828: 826: 823: 821: 818: 816: 813: 811: 808: 806: 803: 801: 798: 796: 793: 791: 788: 786: 783: 781: 778: 776: 773: 771: 768: 766: 763: 761: 758: 756: 753: 751: 748: 746: 743: 741: 738: 736: 733: 731: 728: 726: 723: 721: 718: 716: 713: 711: 708: 706: 703: 702: 700: 696: 691: 681: 678: 676: 673: 671: 668: 666: 663: 661: 658: 656: 653: 651: 648: 646: 643: 641: 638: 636: 633: 631: 628: 626: 623: 621: 618: 616: 613: 612: 610: 606: 602: 595: 590: 588: 583: 581: 576: 575: 572: 568: 565: 534: 531: 528: 527: 523: 516: 512: 508: 504: 500: 495: 491: 485: 481: 477: 472: 468: 464: 460: 456: 452: 447: 443: 439: 435: 431: 427: 422: 418: 414: 410: 406: 402: 397: 393: 389: 385: 381: 377: 372: 371: 366: 359: 353: 349: 345: 340: 336: 330: 326: 322: 317: 316: 311: 304: 299: 296: 293:, p. 26. 292: 287: 284: 281: 278: 273: 270: 265: 259: 256: 250: 248: 246: 242: 238: 230:River traffic 229: 227: 225: 221: 217: 213: 209: 205: 197: 195: 193: 189: 185: 184:acidification 181: 177: 173: 168: 166: 162: 158: 154: 150: 149:River Glaslyn 146: 142: 138: 133: 131: 127: 122: 120: 116: 111: 109: 105: 101: 97: 93: 89: 85: 80: 75: 71: 67: 59: 57: 55: 51: 47: 43: 39: 35: 28: 23: 16: 1699:Ynys Gifftan 1648:Afon Glaslyn 1638:Afon Dysynni 1632: 1245:Mynydd Nefyn 1230:Morfa Bychan 1190:Llanystumdwy 1185:Llanymawddwy 1175:Llanuwchllyn 1125:Llangelynnin 1090:Llanfaelrhys 1055:Llandegwning 940:Dolmelinllyn 920:Dinas Dinlle 890:Corris Uchaf 885:Clynnog Fawr 845:Bwlch-derwin 795:Betws Garmon 745:Aberllefenni 740:Abergynolwyn 537: 532: 498: 475: 450: 425: 404: 400: 375: 343: 320: 305:, p. 9. 298: 286: 279: 272: 258: 241:spring tides 233: 203: 201: 188:biodiversity 169: 160: 134: 123: 112: 70:Moelwyn Mawr 63: 50:Tremadog Bay 34:River Dwyryd 33: 31: 15: 1673:Afon Seiont 1653:Afon Llyfni 1643:Afon Fathew 1633:Afon Dwyryd 1628:Afon Dwyfor 1536:Coleg Menai 1490:Y Felinheli 1455:Trawsfynydd 1450:Tanygrisiau 1410:Rhydyclafdy 1380:Rhoshirwaun 1365:Rhiwddolion 1350:Portmeirion 1305:Penmaenpool 1280:Pen-y-meinl 1235:Morfa Nefyn 1155:Llanllechid 1135:Llangwnnadl 1120:Llanfrothen 955:Efailnewydd 945:Dwygyfylchi 880:Clwt-y-bont 855:Capel Celyn 755:Abertrinant 559: / 291:Senior 2013 208:Trawsfynydd 204:Afon Prysor 198:Afon Prysor 165:Portmeirion 161:green beach 145:Pont Briwet 90:) south of 52:, south of 42:Afon Dwyryd 1842:Categories 1795:Public art 1663:Afon Ogwen 1623:Afon Daron 1613:Afon Cegin 1608:Afon Artro 1603:River Adda 1582:Fort Belan 1475:Tudweiliog 1425:Tal-y-llyn 1405:Rhyd-uchaf 1390:Rhostryfan 1385:Rhoslefair 1375:Rhosgadfan 1205:Llwyngwril 1200:Llwyndyrys 1160:Llanllyfni 1145:Llaniestyn 1095:Llanfaglan 1080:Llanelltyd 1060:Llandudwen 1035:Llanbedrog 1000:Glasinfryn 995:Gellilydan 990:Garneddwen 965:Fairbourne 935:Dolbenmaen 835:Brynrefail 815:Bontnewydd 775:Beddgelert 715:Aberdesach 705:Aberangell 670:Porthmadog 655:Ffestiniog 640:Caernarfon 544:52°58′32″N 409:Caernarfon 303:Lewis 1989 251:References 237:Porthmadog 176:Ordovician 157:salt marsh 115:confluence 96:glaciation 92:Ffestiniog 66:Ffestiniog 54:Porthmadog 1815:Geography 1763:Grade II* 1598:Afon Aber 1514:Education 1430:Talsarnau 1330:Penygroes 1285:Penffridd 1275:Pant Glas 1225:Minffordd 1220:Mellteyrn 1210:Maentwrog 1195:Llithfaen 1150:Llanigian 1085:Llanengan 1075:Llanegryn 1070:Llandygai 1065:Llandwrog 1045:Llandanwg 1040:Llanberis 1025:Llanarmon 960:Eisingrug 910:Deiniolen 905:Cwm-y-glo 865:Carnguwch 830:Bryn-crug 825:Bryncroes 730:Abergeirw 710:Aberdaron 650:Dolgellau 645:Criccieth 547:3°56′42″W 417:0308-2334 180:base-poor 137:Maentwrog 130:Llyn Mair 88:waterfall 60:Geography 27:Maentwrog 1730:Churches 1485:Waunfawr 1470:Tremadog 1465:Tregarth 1445:Talysarn 1395:Rhyd Ddu 1295:Penllech 1265:Nasareth 1180:Llanwnda 1140:Llangybi 1130:Llangian 1100:Llanfair 1030:Llanbedr 1015:Llanaber 1005:Groeslon 980:Ganllwyd 975:Frongoch 930:Dinorwig 850:Caeathro 820:Botwnnog 800:Bodferin 790:Bethesda 780:Bethania 760:Afon Wen 750:Abersoch 725:Abererch 720:Aberdyfi 675:Pwllheli 630:Bethesda 625:Barmouth 515:35784878 480:Llanrwst 467:41159259 442:59073406 392:26878862 348:Llanrwst 280:Penmorfa 172:Cambrian 79:SH695438 1790:Museums 1775:History 1758:Grade I 1740:Schools 1687:Islands 1541:Schools 1355:Prenteg 1340:Pontrug 1335:Pistyll 1315:Penrhos 1300:Penllyn 1260:Nantmor 1250:Mynytho 1215:Mallwyd 1170:Llanrug 1165:Llannor 900:Croesor 875:Chwilog 810:Bontddu 660:Harlech 601:Gwynedd 503:Cardiff 312:Sources 141:estuary 46:Gwynedd 1735:Places 1718:Topics 1591:Rivers 1505:Y Rhiw 1500:Y Fron 1495:Y Ffor 1460:Trefor 1360:Rachub 1310:Pennal 895:Corris 870:Ceidio 860:Carmel 805:Boduan 785:Bethel 770:Arthog 765:Anelog 620:Bangor 513:  486:  465:  455:Bangor 440:  430:Bangor 415:  390:  380:Bangor 354:  331:  1827:Wales 1745:SSSIs 1480:Tywyn 970:Friog 950:Edern 915:Dinas 680:Tywyn 665:Nefyn 84:gorge 38:Welsh 1420:Soar 1400:Rhyd 1270:Nebo 840:Buan 615:Bala 511:OCLC 484:ISBN 463:OCLC 438:OCLC 413:ISSN 388:OCLC 352:ISBN 329:ISBN 216:A470 202:The 192:army 174:and 102:and 32:The 135:At 1844:: 509:. 505:: 501:. 478:. 461:. 457:: 453:. 436:. 432:: 428:. 407:. 405:24 403:. 386:. 382:: 378:. 346:. 323:. 167:. 132:. 76:: 56:. 40:: 593:e 586:t 579:v 517:. 492:. 469:. 444:. 419:. 394:. 360:. 337:. 266:. 36:(

Index


Maentwrog
Welsh
Gwynedd
Tremadog Bay
Porthmadog
Ffestiniog
Moelwyn Mawr
grid reference
SH695438
gorge
waterfall
Ffestiniog
glaciation
glacial moraines
riverine gravel deposits
Vale of Ffestiniog
confluence
Llyn Trawsfynydd
Plas Tan y Bwlch
Llyn Mair
Maentwrog
estuary
Pont Briwet
River Glaslyn
Porthmadog Bay
salt marsh
Portmeirion
Cambrian
Ordovician

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