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Home › Rivers › Rhondda

Rhondda water levels

1 gauge, at Trehafod River Station. It is not above its typical high. 6 storm overflows upstream are discharging now. Gauges in Rhondda Cynon Taf; levels are checked every 15 minutes.

1gauge
0above normal
6overflows upstream discharging

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Gauges

Monitoring stations, source to mouth

StationTownLevel nowStatusTrend
Trehafod River Station—0.72 m 31m 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 Rhondda above one of its gauges, from the source down. Named streams without a gauge that have a page here are listed at the end.

2 gauged tributaries, 3 gauges

Rhondda Fach

Joins the Rhondda above Trehafod River Station, its highest gauge, no more than 14.1 km by river above Trehafod River Station.

Maerdy River Station0.27 m 16m agoWithin its typical range

Its water passes every gauge on the Rhondda, from Trehafod River Station down.

Where the Rhondda goes

Below Trehafod River Station, its water next reaches Pontypridd River Station, a gauge on Taff, 3.3 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.

Streams without a gauge

Named streams on the river map that flow into the Rhondda 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

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

  • 6 report discharging now
  • 61 not discharging
  • 6 offline or silent: 6 monitor offline, 0 status unknown, 0 no live feed

Official figures for 2025, for the overflows traced upstream of Trehafod River Station: 3,298 spills over 15,312 hours in total, across the 72 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 Rhondda includes the smaller streams that join it there. Every overflow traced is listed here, each stretch in full. Back to the short lists →

Above Trehafod River Station, the Rhondda’s highest gauge49 overflows · 4 discharging now
Rhondda Fawr, above Tynewydd River Stationjoins the Rhondda above Trehafod River Station3 overflows
Rhondda Fawr, above Gelli River Stationjoins the Rhondda above Trehafod River Station21 overflows · 2 discharging now

18 other overflows within 3 km of these gauges are placed below the Rhondda’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 → Rhondda Cynon Taf rivers → All UK rivers