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River Dwyryd

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701: 229:. 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 1833: 33: 1821: 245:
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
93:. 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 193:. 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 166:. 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 1755: 201:
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
551: 1780: 275:"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" 1735: 89: 250:, 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 230: 217:
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
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Sails on the Dwyryd, The River Transport of Ffestiniog Slate
105:. The main river then flows through a wide valley formed by 580: 197:. This has constrained the quality of the fishery and the 221:
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
1728: 1697: 1601: 1560: 1524: 708: 618: 132:but does not receive any water from the reservoir. 79:. At its most northern extent, water draining from 508:Welsh Region, National Rivers Authority (1995). 487:Two Snowdonia rivers : Glaslyn & Dwyryd 174:) on its south bank and opposite the village of 75:The Dwyryd rises in the hills to the north of 596: 154:, flowing under the road and railway line at 8: 460:Parr, W.; Wheeler, M.; Codling, I. (1999). 437:Sedimentary processes in the Dwyryd estuary 603: 589: 581: 485:Richards, Alun John; Napier, Jean (2008). 150:the Dwyryd becomes a long and sandy tidal 355:The Vale of Ffestiniog and its Hinterland 158:, before joining with the estuary of the 338:: Snowdonia National Park Study Centre. 266: 301: 313: 109:, with a broad flat base formed from 7: 1126:Llanfihangel-y-Pennant, Dolbenmaen 25: 445:University College of North Wales 395:University College of North Wales 385:Cook, W.; Rees, E. I. S. (1978). 225:, a large reservoir close to the 1831: 1819: 699: 124:The Afon Tafarn-helyg has its 1: 470:Countryside Council for Wales 1781:Registered parks and gardens 1736:Parliamentary constituencies 544:National Library of Scotland 235:hydro-electric power station 422:: Gwynedd Archives: 41–49. 288:Slate traffic on the Dwyryd 1880: 1451:Tal-y-bont (near Barmouth) 1814: 697: 518:National Rivers Authority 1446:Tal-y-bont (near Bangor) 1116:Llanfihangel Bachellaeth 435:Mahamod, Yusuff (1989). 353:Senior, Michael (2013). 115:riverine gravel deposits 493:: Gwasg Carreg Gwalch. 361:: Gwasg Carreg Gwalch. 231:national nature reserve 162:and then entering into 29:River in Gwynedd, Wales 1720:Saint Tudwal's Islands 1121:Llanfihangel-y-Pennant 330:Lewis, M.J.T. (1989). 52: 40: 619:Principal settlements 246:of what would become 170:known as Glastraeth ( 35: 1542:Coleg Meirion-Dwyfor 567:52.97562°N 3.94496°W 36:The River Dwyryd at 1864:Rivers of Snowdonia 563: /  709:Towns and villages 646:Blaenau Ffestiniog 572:52.97562; -3.94496 256:Ffestiniog Railway 119:Vale of Ffestiniog 117:. The valley, the 41: 1859:Rivers of Gwynedd 1846: 1845: 1765:Listed buildings 1568:Caernarfon Castle 1561:Castles and forts 1532:Bangor University 500:978-0-9512373-3-5 368:978-0-8452-7225-1 345:978-1-84527-206-7 55:), is a river in 18:Llyn Hafod y Llyn 16:(Redirected from 1871: 1836: 1835: 1834: 1824: 1823: 1822: 1791:Lord Lieutenants 1715:Ynys Gwylan-fawr 1583:Dolbadarn Castle 1578:Criccieth Castle 1331:Penrhyndeudraeth 1251:Mynydd Llandygai 703: 605: 598: 591: 582: 578: 577: 575: 574: 573: 568: 564: 561: 560: 559: 556: 529: 504: 481: 456: 431: 406: 378:Further material 372: 349: 336:Plas Tan y Bwlch 317: 311: 305: 299: 293: 285: 279: 278: 271: 223:Llyn Trawsfynydd 137:Plas Tan y Bwlch 130:Llyn Trawsfynydd 111:glacial moraines 92: 21: 1879: 1878: 1874: 1873: 1872: 1870: 1869: 1868: 1849: 1848: 1847: 1842: 1832: 1830: 1820: 1818: 1810: 1724: 1693: 1629:Afon Cwmnantcol 1597: 1556: 1520: 1426:Sarn Meyllteyrn 1336:Pentre Gwynfryn 1021:Llan Ffestiniog 704: 695: 614: 609: 571: 569: 565: 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1388: 1383: 1381:Rhos-y-gwaliau 1378: 1373: 1368: 1363: 1358: 1353: 1348: 1343: 1338: 1333: 1328: 1323: 1318: 1313: 1308: 1303: 1298: 1293: 1288: 1283: 1278: 1273: 1268: 1266:Nantlle Valley 1263: 1258: 1253: 1248: 1243: 1238: 1233: 1228: 1223: 1218: 1213: 1208: 1203: 1198: 1193: 1188: 1183: 1178: 1173: 1168: 1163: 1158: 1153: 1148: 1143: 1138: 1133: 1128: 1123: 1118: 1113: 1108: 1103: 1098: 1093: 1088: 1083: 1078: 1073: 1068: 1063: 1061:Llanddeiniolen 1058: 1053: 1048: 1043: 1038: 1033: 1028: 1023: 1018: 1013: 1008: 1003: 998: 996:Garndolbenmaen 993: 988: 983: 978: 973: 968: 963: 958: 953: 948: 943: 938: 933: 928: 923: 918: 913: 908: 903: 898: 893: 888: 883: 878: 873: 868: 863: 858: 853: 848: 843: 838: 833: 828: 823: 818: 813: 808: 803: 798: 793: 788: 783: 778: 773: 768: 763: 758: 753: 748: 746:Abergwyngregyn 743: 738: 733: 728: 723: 718: 712: 710: 706: 705: 698: 696: 694: 693: 688: 683: 678: 673: 668: 663: 658: 653: 648: 643: 638: 633: 628: 622: 620: 616: 615: 610: 608: 607: 600: 593: 585: 547: 546: 536: 535:External links 533: 531: 530: 505: 499: 482: 457: 432: 412:Maritime Wales 407: 381: 379: 376: 374: 373: 367: 350: 344: 326: 324: 321: 319: 318: 306: 294: 280: 265: 263: 260: 242: 239: 210: 207: 189:which are all 164:Porthmadog Bay 85:grid reference 72: 69: 28: 24: 14: 13: 10: 9: 6: 4: 3: 2: 1876: 1865: 1862: 1860: 1857: 1856: 1854: 1839: 1829: 1827: 1817: 1816: 1813: 1807: 1804: 1802: 1799: 1797: 1796:High Sheriffs 1794: 1792: 1789: 1787: 1784: 1782: 1779: 1775: 1772: 1770: 1767: 1766: 1764: 1762: 1759: 1757: 1754: 1752: 1749: 1747: 1744: 1742: 1739: 1737: 1734: 1733: 1731: 1727: 1721: 1718: 1716: 1713: 1711: 1708: 1706: 1703: 1702: 1700: 1696: 1690: 1689:Afon Tryweryn 1687: 1685: 1682: 1680: 1677: 1675: 1672: 1670: 1669:Afon Mawddach 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: 1606: 1604: 1600: 1594: 1591: 1589: 1586: 1584: 1581: 1579: 1576: 1574: 1571: 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1256:Mynydd Nefyn 1241:Morfa Bychan 1201:Llanystumdwy 1196:Llanymawddwy 1186:Llanuwchllyn 1136:Llangelynnin 1101:Llanfaelrhys 1066:Llandegwning 951:Dolmelinllyn 931:Dinas Dinlle 901:Corris Uchaf 896:Clynnog Fawr 856:Bwlch-derwin 806:Betws Garmon 756:Aberllefenni 751:Abergynolwyn 548: 543: 509: 486: 461: 436: 415: 411: 386: 354: 331: 316:, p. 9. 309: 297: 290: 283: 269: 252:spring tides 244: 214: 212: 199:biodiversity 180: 171: 145: 134: 123: 81:Moelwyn Mawr 74: 61:Tremadog Bay 45:River Dwyryd 44: 42: 26: 1684:Afon Seiont 1664:Afon Llyfni 1654:Afon Fathew 1644:Afon Dwyryd 1639:Afon Dwyfor 1547:Coleg Menai 1501:Y Felinheli 1466:Trawsfynydd 1461:Tanygrisiau 1421:Rhydyclafdy 1391:Rhoshirwaun 1376:Rhiwddolion 1361:Portmeirion 1316:Penmaenpool 1291:Pen-y-meinl 1246:Morfa Nefyn 1166:Llanllechid 1146:Llangwnnadl 1131:Llanfrothen 966:Efailnewydd 956:Dwygyfylchi 891:Clwt-y-bont 866:Capel Celyn 766:Abertrinant 570: / 302:Senior 2013 219:Trawsfynydd 215:Afon Prysor 209:Afon Prysor 176:Portmeirion 172:green beach 156:Pont Briwet 101:) south of 63:, south of 53:Afon Dwyryd 1853:Categories 1806:Public art 1674:Afon Ogwen 1634:Afon Daron 1624:Afon Cegin 1619:Afon Artro 1614:River Adda 1593:Fort Belan 1486:Tudweiliog 1436:Tal-y-llyn 1416:Rhyd-uchaf 1401:Rhostryfan 1396:Rhoslefair 1386:Rhosgadfan 1216:Llwyngwril 1211:Llwyndyrys 1171:Llanllyfni 1156:Llaniestyn 1106:Llanfaglan 1091:Llanelltyd 1071:Llandudwen 1046:Llanbedrog 1011:Glasinfryn 1006:Gellilydan 1001:Garneddwen 976:Fairbourne 946:Dolbenmaen 846:Brynrefail 826:Bontnewydd 786:Beddgelert 726:Aberdesach 716:Aberangell 681:Porthmadog 666:Ffestiniog 651:Caernarfon 555:52°58′32″N 420:Caernarfon 314:Lewis 1989 262:References 248:Porthmadog 187:Ordovician 168:salt marsh 126:confluence 107:glaciation 103:Ffestiniog 77:Ffestiniog 65:Porthmadog 1826:Geography 1774:Grade II* 1609:Afon Aber 1525:Education 1441:Talsarnau 1341:Penygroes 1296:Penffridd 1286:Pant Glas 1236:Minffordd 1231:Mellteyrn 1221:Maentwrog 1206:Llithfaen 1161:Llanigian 1096:Llanengan 1086:Llanegryn 1081:Llandygai 1076:Llandwrog 1056:Llandanwg 1051:Llanberis 1036:Llanarmon 971:Eisingrug 921:Deiniolen 916:Cwm-y-glo 876:Carnguwch 841:Bryn-crug 836:Bryncroes 741:Abergeirw 721:Aberdaron 661:Dolgellau 656:Criccieth 558:3°56′42″W 428:0308-2334 191:base-poor 148:Maentwrog 141:Llyn Mair 99:waterfall 71:Geography 38:Maentwrog 1741:Churches 1496:Waunfawr 1481:Tremadog 1476:Tregarth 1456:Talysarn 1406:Rhyd Ddu 1306:Penllech 1276:Nasareth 1191:Llanwnda 1151:Llangybi 1141:Llangian 1111:Llanfair 1041:Llanbedr 1026:Llanaber 1016:Groeslon 991:Ganllwyd 986:Frongoch 941:Dinorwig 861:Caeathro 831:Botwnnog 811:Bodferin 801:Bethesda 791:Bethania 771:Afon Wen 761:Abersoch 736:Abererch 731:Aberdyfi 686:Pwllheli 641:Bethesda 636:Barmouth 526:35784878 491:Llanrwst 478:41159259 453:59073406 403:26878862 359:Llanrwst 291:Penmorfa 183:Cambrian 90:SH695438 1801:Museums 1786:History 1769:Grade I 1751:Schools 1698:Islands 1552:Schools 1366:Prenteg 1351:Pontrug 1346:Pistyll 1326:Penrhos 1311:Penllyn 1271:Nantmor 1261:Mynytho 1226:Mallwyd 1181:Llanrug 1176:Llannor 911:Croesor 886:Chwilog 821:Bontddu 671:Harlech 612:Gwynedd 514:Cardiff 323:Sources 152:estuary 57:Gwynedd 1746:Places 1729:Topics 1602:Rivers 1516:Y Rhiw 1511:Y Fron 1506:Y Ffor 1471:Trefor 1371:Rachub 1321:Pennal 906:Corris 881:Ceidio 871:Carmel 816:Boduan 796:Bethel 781:Arthog 776:Anelog 631:Bangor 524:  497:  476:  466:Bangor 451:  441:Bangor 426:  401:  391:Bangor 365:  342:  1838:Wales 1756:SSSIs 1491:Tywyn 981:Friog 961:Edern 926:Dinas 691:Tywyn 676:Nefyn 95:gorge 49:Welsh 1431:Soar 1411:Rhyd 1281:Nebo 851:Buan 626:Bala 522:OCLC 495:ISBN 474:OCLC 449:OCLC 424:ISSN 399:OCLC 363:ISBN 340:ISBN 227:A470 213:The 203:army 185:and 113:and 43:The 146:At 1855:: 520:. 516:: 512:. 489:. 472:. 468:: 464:. 447:. 443:: 439:. 418:. 416:24 414:. 397:. 393:: 389:. 357:. 334:. 178:. 143:. 87:: 67:. 51:: 604:e 597:t 590:v 528:. 503:. 480:. 455:. 430:. 405:. 371:. 348:. 277:. 47:( 20:)

Index

Llyn Hafod y Llyn

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

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