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Home › Rivers › River Tawe

River Tawe water levels

5 gauges from Craig Y Nos River Station to Morfa River Station. None of the 4 that can be compared with a typical high is above it. 9 storm overflows upstream are discharging now. Gauges in Powys, Swansea; levels are checked every 15 minutes.

5gauges
0above normal
9overflows upstream discharging

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Gauges

Monitoring stations, source to mouth

StationTownLevel nowStatusTrend
Craig Y Nos River StationCraig-y-nos0.73 m 16m agoWithin its typical range▼
Teddybear Bridge River Station 10.4 km by river—1.10 m 31m agoWithin its typical range▼
Ystradgynlais River Station 1.2 km by riverYstradgynlais0.76 m 16m agoWithin its typical range▼
Ynystanglws River Station 16.6 km by river—1.38 m 16m agoWithin its typical range▼
Morfa River Stationtidal 5.7 km by river—3.81 m 16m agoWithin its typical range—

Stations are listed from source to mouth as the water flows, traced on the river map (OS Open Rivers) and the Environment Agency’s own links between its gauges. A distance “by river” is along the river, and is shown only where the map traces the path.

Contains OS data © Crown copyright and database rights 2026.

Gauged tributaries

Streams and rivers with a gauge whose water joins the Tawe above one of its gauges, from the source down. Named streams without a gauge that have a page here are listed at the end.

3 gauged tributaries, 3 gauges

Where the Tawe goes

No gauge below Morfa River Station is known on the river map.

Tributaries and where they join are traced on the river map (OS Open Rivers, edition 2026-04) and the Environment Agency’s links between its gauges. The map holds distances between gauges, not the junctions themselves, so a junction is placed between two gauges, and no further up than the tributary’s own lowest gauge. Contains OS data © Crown copyright and database rights 2026.

Streams without a gauge

Named streams on the river map that flow into the Tawe and have no gauge of their own. Each has a page with what is known about it: the next gauge downstream, and any storm overflows or water-sampling points placed on it.

Storm overflows upstream

46 storm overflows are traced upstream of Morfa River Station, the Tawe’s lowest gauge on the river map: on the Tawe itself, on its gauged tributaries, and on smaller streams that join above there.

  • 9 report discharging now
  • 33 not discharging
  • 4 offline or silent: 4 monitor offline, 0 status unknown, 0 no live feed

Official figures for 2025, for the overflows traced upstream of Morfa River Station: 2,571 spills over 17,908 hours in total, across the 45 that have a figure. 1 has no 2025 figure.

Each overflow is listed in the stretch above the first gauge its water reaches, from the source down, as on the Gauges tab. A stretch of the Tawe includes the smaller streams that join it there. Every overflow traced is listed here, each stretch in full. Back to the short lists →

Between Craig Y Nos River Station and Teddybear Bridge River Station7 overflows · 2 discharging now
Between Teddybear Bridge River Station and Ystradgynlais River Station3 overflows
Between Ystradgynlais River Station and Ynystanglws River Station18 overflows · 5 discharging now
  • Heol Glantawe Ystradgynlais No 2 Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into River Tawe · 16.7 km by river above Ynystanglws River Station · 2025: 74 spills, 252 h
  • Ystradgynlais WwTW Wetland Return Storm Overflow Discharging now since
    Dwr Cymru Welsh Water · into River Tawe · 14.9 km by river above Ynystanglws River Station · 2025: 48 spills, 724 h
  • Ystalyfera Glanyrafon Road Storm Overflow Monitor offline
    Dwr Cymru Welsh Water · into River Tawe · 13.9 km by river above Ynystanglws River Station · 2025: 45 spills, 116 h
  • River Tawe Godre'r Graig Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into River Tawe · 11.6 km by river above Ynystanglws River Station · 2025: 13 spills, 19 h
  • A4067 And Ynysmeudw Road Roundabout Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into River Tawe · 10.0 km by river above Ynystanglws River Station · 2025: 41 spills, 197 h
  • Lon Catwg Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Unnamed Tributary Of The Nant Gelli-Nedd · 9.1 km by river above Ynystanglws River Station · 2025: 40 spills, 88 h
  • Tawe Terrace Storm Overflow Monitor offline
    Dwr Cymru Welsh Water · into River Tawe · 7.4 km by river above Ynystanglws River Station · 2025: 14 spills, 53 h
  • Pontardawe Leisure Centre Storm Overflow Discharging now since
    Dwr Cymru Welsh Water · into River Tawe · 6.7 km by river above Ynystanglws River Station · 2025: 83 spills, 378 h
  • Trebanos The Grove Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into River Tawe · 5.7 km by river above Ynystanglws River Station · 2025: 101 spills, 900 h
  • Trebanos WwTW Storm Overflow Discharging now since bathing water
    Dwr Cymru Welsh Water · into River Tawe · 4.9 km by river above Ynystanglws River Station · 2025: 140 spills, 2,476 h
  • Ynys Y Mond Road Swansea Overflow Not discharging
    Dwr Cymru Welsh Water · into River Tawe · 3.2 km by river above Ynystanglws River Station · 2025: 28 spills, 39 h
  • Station Road Glais Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into River Tawe · 3.0 km by river above Ynystanglws River Station · 2025: 36 spills, 117 h
  • Heol Eithrym Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Lower Afon Clydach · 2.6 km by river above Ynystanglws River Station · 2025: 51 spills, 216 h
  • Heol-Y-Nant Sybil Street Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into River Tawe · 2.0 km by river above Ynystanglws River Station · 2025: 4 spills, 1.0 h
  • Clydach Bridge Street Storm Overflow Discharging now since
    Dwr Cymru Welsh Water · into River Tawe · 1.9 km by river above Ynystanglws River Station · 2025: 114 spills, 1,084 h
  • Hebron Road Storm Overflow Monitor offline
    Dwr Cymru Welsh Water · into Lower Afon Clydach · 1.9 km by river above Ynystanglws River Station · 2025: 69 spills, 225 h
  • Quarr Rd Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into River Tawe · 1.9 km by river above Ynystanglws River Station · 2025: 0 spills, 0 h
  • Clydach Road Side Street Storm Overflow Discharging now since
    Dwr Cymru Welsh Water · into River Tawe · 580 m by river above Ynystanglws River Station · 2025: 96 spills, 688 h
Twrch, above Gurnos River Stationjoins the Tawe above Ynystanglws River Station8 overflows · 1 discharging now
Upper Clydach River, above Pontardawejoins the Tawe above Ynystanglws River Station2 overflows
Between Ynystanglws River Station and Morfa River Station8 overflows · 1 discharging now
  • Heol Dyfan Swansea Overflow Not discharging
    Dwr Cymru Welsh Water · into River Tawe · 5.0 km by river above Morfa River Station · 2025: 61 spills, 81 h
  • Samlet Road Storm Overflow Discharging now since
    Dwr Cymru Welsh Water · into Nant-Y-Fendrod · 3.3 km by river above Morfa River Station · 2025: 56 spills, 354 h
  • Crown Street Morriston Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into The Nant Melyn · 2.9 km by river above Morfa River Station · 2025: 53 spills, 59 h · placed on the river by its position alone
  • Slate Street Junciton With Margam Avenue Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into The Nant Melyn · 2.9 km by river above Morfa River Station · 2025: 4 spills, 1.3 h · placed on the river by its position alone
  • Beacons View Road Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into River Tawe · 2.8 km by river above Morfa River Station · no official annual figure
  • Wychtree Street Beaufort Road Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into River Tawe · 2.0 km by river above Morfa River Station · 2025: 79 spills, 664 h
  • Heol Nant Gelli Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Cwm Gelli Stream, Tributary Of The Afon Tawe · 1.3 km by river above Morfa River Station · 2025: 0 spills, 0 h
  • Ffordd Cwm Tawe Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into River Tawe · 400 m by river above Morfa River Station · 2025: 92 spills, 315 h

Near these gauges, connection not known

Within 3 km of one of the Tawe’s gauges in a straight line, but the river map cannot say whether their water reaches it.

  • Heol Glantawe Ystradgynlais Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into River Afan · 90 m from Ystradgynlais River Station in a straight line · its recorded watercourse is not the one mapped beside it · 2025: 14 spills, 42 h
  • Bonymaen Road No. 2 Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into River Tawe · 830 m from Morfa River Station in a straight line · no mapped watercourse close enough to be sure · 2025: 49 spills, 57 h
  • Bonymaen Road No. 1 Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into River Tawe · 900 m from Morfa River Station in a straight line · its watercourse is not on the river map · 2025: 52 spills, 64 h
  • Junction Of Cwm Level Road Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Culvert Of The Cwm Gelli Stream · 990 m from Morfa River Station in a straight line · no mapped watercourse close enough to be sure · 2025: 16 spills, 6.5 h
  • Waurn Gyrlais Footpath Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Tributary Of Nant Gyrlais · 990 m from Teddybear Bridge River Station in a straight line · no mapped watercourse close enough to be sure · 2025: 39 spills, 131 h
  • Eaton Road Swansea Overflow Not discharging
    Dwr Cymru Welsh Water · into River Tawe · 1.0 km from Morfa River Station in a straight line · its watercourse is not on the river map · 2025: 1 spill, 0.3 h
  • Llanllienwen Road Clydach Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Unnamed Tributary Of Afon Tawe · 1.0 km from Ynystanglws River Station in a straight line · no mapped watercourse close enough to be sure · 2025: 81 spills, 861 h
  • Llangyfelach Road Car Park Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Cwm Gelli Stream · 1.0 km from Morfa River Station in a straight line · no mapped watercourse close enough to be sure · 2025: 54 spills, 75 h
  • Cwm Road Swansea Storm Overflow Not discharging bathing water
    Dwr Cymru Welsh Water · into Culvert Of The Burlais Brook · 1.4 km from Morfa River Station in a straight line · no mapped watercourse close enough to be sure · 2025: 56 spills, 52 h
  • Walters Road Llansamlet Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Nant Bran · 1.4 km from Ynystanglws River Station in a straight line · its recorded watercourse is not the one mapped beside it · 2025: 58 spills, 399 h
  • Swansea Penlan Fach Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Cwm Gelli Stream · 1.5 km from Morfa River Station in a straight line · its watercourse is not on the river map · 2025: 65 spills, 146 h
  • Swansea Between Camarthen Road & Gors Avenue Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Culvert Of The Burlais Brook · 1.6 km from Morfa River Station in a straight line · its watercourse is not on the river map · 2025: 4 spills, 1.0 h
  • Cwmbwrla Roundabout Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Culvert Of The Burlais Brook · 1.7 km from Morfa River Station in a straight line · its watercourse is not on the river map · 2025: 53 spills, 292 h
  • Drummau Road Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Nant-Y-Fendrod · 1.8 km from Ynystanglws River Station in a straight line · no mapped watercourse close enough to be sure · 2025: 14 spills, 27 h
  • Chemical Road Junction Of Sway Road Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Unnamed Tributary Of Afon Taf · 1.8 km from Ynystanglws River Station in a straight line · no mapped watercourse close enough to be sure · 2025: 1 spill, 0.3 h

17 more near these gauges whose connection is not known.

1 other overflow within 3 km of these gauges is placed below the Tawe’s lowest gauge or on another river, so not listed.

A status is the water company’s own monitor: it says whether an overflow is discharging, never how much or why, and a spill does not by itself explain a change in a river level. A status older than two hours is shown as unknown. Annual figures are the official returns: 12/24-hour spills for England and Wales, overflow events for Scotland (Scottish Water counts differently, so the two cannot be compared). “No data” means the monitor produced no usable data that year, not zero. Overflows are placed on OS Open Rivers (edition 2026-04), which leaves out many small channels: an overflow the map cannot place may still drain here. Contains OS data © Crown copyright and database rights 2026. Sewage in Britain’s rivers →

Live status: © Dŵr Cymru Welsh Water, from its Storm Overflow Map. Annual figures for Wales: Dŵr Cymru Welsh Water’s return to Natural Resources Wales, as compiled by The Rivers Trust, Open Government Licence.

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