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Home › Rivers › Llynfi

Llynfi water levels

4 gauges. None of the 3 that can be compared with a typical high is above it. 2 storm overflows upstream are discharging now. Gauges in Bridgend, Powys; levels are checked every 15 minutes.

4gauges
0above normal
2overflows upstream discharging
Several distinct UK rivers share the name “Llynfi” — sections below are grouped by catchment.

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Gauges

Llynfi — Mid-Glamorgan Group

3 stations in this catchment

StationTownLevel nowStatusTrend
Maesteg River StationMaesteg0.35 m 17m agoWithin its typical range—
Coytrahen River Station 8.3 km by riverCoytrahen0.59 m 32m agoWithin its typical range—
Aberkenfig River Stationtidal 1.6 km by river—0.84 m 32m agoWithin its typical range▼

Llynfi — Wye

1 station in this catchment

StationTownLevel nowStatusTrend
Three Cocks River Stationplace estimated—0.32 m 32m 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 Llynfi above one of its gauges, from the source down. Named streams without a gauge that have a page here are listed at the end.

Llynfi — Mid-Glamorgan Group

No gauged tributary joins the Llynfi above Aberkenfig River Station on the river map. Streams without a gauge are not counted here.

Where the Llynfi goes

Below Aberkenfig River Station, its water next reaches Bridgend River Station, a gauge on Ogmore, 5.9 km by river downstream.

Llynfi — Wye

No gauged tributary joins the Llynfi above Three Cocks River Station on the river map. Streams without a gauge are not counted here.

Where the Llynfi goes

Below Three Cocks River Station, its water next reaches Glasbury River Station, a gauge on River Wye, 3.0 km by river downstream.

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.

Llynfi — Mid-Glamorgan Group

Streams without a gauge

Named streams on the river map that flow into the Llynfi 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.

  • Nant y Twlc (joins about 7.7 km above Coytrahen River Station)

Llynfi — Wye

Streams without a gauge

  • Felindre Brook (joins about 2.9 km above Glasbury River Station)
  • River Ennig (joins about 3.9 km above Three Cocks River Station)

Storm overflows upstream

Llynfi — Mid-Glamorgan Group

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

  • 2 report discharging now
  • 19 not discharging
  • 0 offline or silent: 0 monitor offline, 0 status unknown, 0 no live feed

Official figures for 2025, for the overflows traced upstream of Aberkenfig River Station: 1,246 spills over 8,040 hours in total, across all 21.

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 Llynfi includes the smaller streams that join it there.

Above Maesteg River Station, the Llynfi’s highest gauge11 overflows · 1 discharging now
Between Maesteg River Station and Coytrahen River Station9 overflows · 1 discharging now
Between Coytrahen River Station and Aberkenfig River Station1 overflow
  • Riverside Coytrahen Overflow Not discharging
    Dwr Cymru Welsh Water · into River Llynfi · 1.5 km by river above Aberkenfig River Station · 2025: 10 spills, 6.0 h

4 other overflows within 3 km of these gauges are placed below the Llynfi’s lowest gauge or on another river, so not listed.

Llynfi — Wye

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

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

Official figures for 2025, for the overflows traced upstream of Three Cocks River Station: 69 spills over 377 hours in total, across all 5.

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 Llynfi includes the smaller streams that join it there.

Above Three Cocks River Station, the Llynfi’s highest gauge5 overflows
  • Llangors Overflow Not discharging
    Dwr Cymru Welsh Water · into River Llynfi · 12.2 km by river above Three Cocks River Station · 2025: 4 spills, 18 h
  • Trefecca Old Railway Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into River Llynfi · 7.0 km by river above Three Cocks River Station · 2025: 22 spills, 103 h
  • Bronllys Road South Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into River Ennig · 4.3 km by river above Three Cocks River Station · 2025: 6 spills, 6.8 h
  • Bronllys Road North Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into River Llynfi · 3.9 km by river above Three Cocks River Station · 2025: 6 spills, 4.3 h
  • Talgarth WwTW Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into River Llynfi · 3.7 km by river above Three Cocks River Station · 2025: 31 spills, 245 h

4 other overflows within 3 km of these gauges are placed below the Llynfi’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.

Wave tracker for this river → Bridgend rivers → Powys rivers → All UK rivers