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Nant-y-fendrod water levels

1 gauge, at Clarion Close River Station. It is not above its typical high. Gauges in Swansea; levels are checked every 15 minutes.

1gauge

0above normal

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Gauges

Monitoring stations, source to mouth

Station	Town	Level now	Status	Trend
Clarion Close River Station	—	0.65 m 33m ago	Within 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 Nant-y-fendrod above one of its gauges, from the source down. The river map knows where gauges are, not every stream, so a tributary without a gauge is not listed here.

No gauged tributary joins the Nant-y-fendrod above Clarion Close River Station on the river map. Streams without a gauge are not counted here.

Where the Nant-y-fendrod goes

Below Clarion Close River Station, its water next reaches Morfa River Station, a gauge on River Tawe, 3.6 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.

Storm overflows upstream

None of the storm overflows FloodRadar holds is traced upstream of Clarion Close River Station on the river map. That is not the same as none: the map leaves out many small streams and culverts, so an overflow it cannot place may still drain here, and not every company publishes every overflow.

Near these gauges, connection not known

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

Peniel Green Road Storm Overflow Not discharging
Dwr Cymru Welsh Water · into Tributary Of Nant-Bran · 930 m from Clarion Close River Station in a straight line · no mapped watercourse close enough to be sure · 2025: 33 spills, 123 h
Bethel Road Llansamlet Storm Overflow Not discharging
Dwr Cymru Welsh Water · into Tributary Of Nant-Bran · 1.0 km from Clarion Close River Station in a straight line · no mapped watercourse close enough to be sure · 2025: 5 spills, 4.5 h
Trallwn Community Centre Storm Overflow Not discharging
Dwr Cymru Welsh Water · into Nant Bran · 1.1 km from Clarion Close River Station in a straight line · its watercourse is not on the river map · 2025: 31 spills, 14 h
Walters Road Llansamlet Storm Overflow Not discharging
Dwr Cymru Welsh Water · into Nant Bran · 1.1 km from Clarion Close River Station in a straight line · its recorded watercourse is not the one mapped beside it · 2025: 58 spills, 399 h
Chemical Road Junction Of Sway Road Storm Overflow Not discharging
Dwr Cymru Welsh Water · into Unnamed Tributary Of Afon Taf · 1.3 km from Clarion Close River Station in a straight line · no mapped watercourse close enough to be sure · 2025: 1 spill, 0.3 h
Pentrepoeth Road Storm Overflow Not discharging
Dwr Cymru Welsh Water · into Cwmrhydyceirw Brook · 1.4 km from Clarion Close River Station in a straight line · no mapped watercourse close enough to be sure · 2025: 51 spills, 22 h
Cwm Bath Road Storm Overflow Not discharging
Dwr Cymru Welsh Water · into Nant Melyn · 1.5 km from Clarion Close River Station in a straight line · no mapped watercourse close enough to be sure · 2025: 2 spills, 0.5 h
Llanllienwen Road Clydach Storm Overflow Not discharging
Dwr Cymru Welsh Water · into Unnamed Tributary Of Afon Tawe · 1.7 km from Clarion Close River Station in a straight line · no mapped watercourse close enough to be sure · 2025: 81 spills, 861 h
Heol Dulais Birchgrove Storm Overflow Not discharging
Dwr Cymru Welsh Water · into Nant Bran · 1.7 km from Clarion Close River Station in a straight line · no mapped watercourse close enough to be sure · 2025: 11 spills, 21 h
Heol Las Storm Overflow Not discharging
Dwr Cymru Welsh Water · into Nant Y Fendrod · 2.0 km from Clarion Close River Station in a straight line · several watercourses close by, nothing to choose between them · 2025: 4 spills, 1.3 h
Birchgrove Road Storm Overflow Not discharging
Dwr Cymru Welsh Water · into Surface Water Culvert Leading To Nant Bran · 2.3 km from Clarion Close River Station in a straight line · several watercourses close by, nothing to choose between them · 2025: 9 spills, 4.5 h
Halfway Pentre-Dwr Storm Overflow Not discharging
Dwr Cymru Welsh Water · into Tributary Of Crymlyn Bog · 2.3 km from Clarion Close River Station in a straight line · no mapped watercourse close enough to be sure · 2025: 12 spills, 27 h
Drummau Road Storm Overflow Not discharging
Dwr Cymru Welsh Water · into Nant-Y-Fendrod · 2.4 km from Clarion Close River Station in a straight line · no mapped watercourse close enough to be sure · 2025: 14 spills, 27 h
Bonymaen Road No. 2 Storm Overflow Not discharging
Dwr Cymru Welsh Water · into River Tawe · 2.8 km from Clarion Close 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 · 2.8 km from Clarion Close River Station in a straight line · its watercourse is not on the river map · 2025: 52 spills, 64 h

8 other overflows within 3 km of these gauges are placed below the Nant-y-fendrod’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 → Swansea rivers → All UK rivers

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