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Home › Rivers › Ebbw

Ebbw water levels

3 gauges from Cwm Elm Street River Station to Rhiwderin River Station. None is above its typical high. 3 storm overflows upstream are discharging now. Gauges in Blaenau Gwent, Caerphilly, Newport; levels are checked every 15 minutes.

3gauges
0above normal
3overflows upstream discharging

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Gauges

Monitoring stations, source to mouth

StationTownLevel nowStatusTrend
Cwm Elm Street River Station—0.28 m 31m agoWithin its typical range—
Risca River Station 20.2 km by river—0.55 m 31m agoWithin its typical range▼
Rhiwderin River Station 3.1 km by river—0.67 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 Ebbw above one of its gauges, from the source down. Named streams without a gauge that have a page here are listed at the end.

1 gauged tributary, 2 gauges

Where the Ebbw goes

No gauge below Rhiwderin 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 Ebbw 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

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

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

Official figures for 2025, for the overflows traced upstream of Rhiwderin River Station: 3,102 spills over 15,449 hours in total, across the 100 that have a figure. 4 had no usable monitor data that year; 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 Ebbw includes the smaller streams that join it there. Every overflow traced is listed here, each stretch in full. Back to the short lists →

Above Cwm Elm Street River Station, the Ebbw’s highest gauge24 overflows
Between Cwm Elm Street River Station and Risca River Station44 overflows · 2 discharging now
Sirhowy, above Ynysddu River Stationjoins the Ebbw above Risca River Station32 overflows
Between Risca River Station and Rhiwderin River Station5 overflows · 1 discharging now

Near these gauges, connection not known

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

  • Thornhill Gardens Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Tributary Of Afon Ebbw Fawr · 60 m from Rhiwderin River Station in a straight line · too close to Rhiwderin River Station to say which side · 2025: 19 spills, 13 h
  • Tredegar Terrace Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Rhynys Brook · 250 m from Risca River Station in a straight line · its recorded watercourse is not the one mapped beside it · 2025: 35 spills, 376 h
  • South Of Aster Close Risca Overflow Not discharging
    Dwr Cymru Welsh Water · into River Ebbw · 730 m from Risca River Station in a straight line · its recorded watercourse is not the one mapped beside it · 2025: 3 spills, 5.0 h
  • Maple Avenue Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into River Ebbw · 950 m from Risca River Station in a straight line · several watercourses close by, nothing to choose between them · 2025: 149 spills, 341 h
  • River Road Cwm Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Ebbw Fach River · 1.4 km from Cwm Elm Street River Station in a straight line · no mapped watercourse close enough to be sure · 2025: 13 spills, 25 h

7 other overflows within 3 km of these gauges are placed below the Ebbw’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 → Blaenau Gwent rivers → Caerphilly rivers → Newport rivers → All UK rivers