3 gauges from Treffgarne River Station to Haverfordwest River Station. None of the 2 that can be compared with a typical high is above it. 2 storm overflows upstream are discharging now. Gauges in Pembrokeshire; levels are checked every 15 minutes.
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.
Streams and rivers with a gauge whose water joins the Western Cleddau above one of its gauges, from the source down. Named streams without a gauge that have a page here are listed at the end.
No gauged tributary joins the Western Cleddau above Haverfordwest River Station on the river map. Streams without a gauge are not counted here.
Named streams on the river map that flow into the Western Cleddau 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.
Afon Anghof (joins about 2.7 km above Treffgarne River Station)
Knock Brook (joins about 2.4 km above Prendergast Mill River Station)
Storm overflows upstream
9 storm overflows are traced upstream of Haverfordwest River Station, the Western Cleddau’s lowest gauge on the river map: on the Western Cleddau itself, on its gauged tributaries, and on smaller streams that join above there.
2 report discharging now
7 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 Haverfordwest River Station: 1,001 spills over 12,252 hours in total, across all 9.
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 Western Cleddau includes the smaller streams that join it there.
Above Treffgarne River Station, the Western Cleddau’s highest gauge6 overflows · 1 discharging now
Castle Morris WwTW Storm OverflowNot discharging Dwr Cymru Welsh Water · into Western Cleddau · 12.6 km by river above Treffgarne River Station · 2025: 11 spills, 6.3 h
Puncheston WwTW Storm OverflowDischarging now since Dwr Cymru Welsh Water · into Tributary Of Afon Anghof · 11.0 km by river above Treffgarne River Station · 2025: 116 spills, 1,813 h
Hayscastle Storm OverflowNot discharging Dwr Cymru Welsh Water · into Western Cleddau · 9.8 km by river above Treffgarne River Station · 2025: 108 spills, 2,068 h
Letterston West WwTW Storm OverflowNot discharging Dwr Cymru Welsh Water · into Western Cleddau · 7.4 km by river above Treffgarne River Station · 2025: 93 spills, 1,246 h
Wolfcastle WwTW Storm OverflowNot discharging Dwr Cymru Welsh Water · into Afon Anghof · 3.1 km by river above Treffgarne River Station · 2025: 225 spills, 1,987 h
Wolfscastle Storm OverflowNot discharging Dwr Cymru Welsh Water · into Afon Anghof · 2.8 km by river above Treffgarne River Station · 2025: 80 spills, 884 h
Between Treffgarne River Station and Prendergast Mill River Station2 overflows · 1 discharging now
Keeston WwTW Storm OverflowDischarging now since Dwr Cymru Welsh Water · into Knock Brook · 6.6 km by river above Prendergast Mill River Station · 2025: 125 spills, 1,834 h
Camrose WwTW OverflowNot discharging Dwr Cymru Welsh Water · into Camrose Brook · 5.2 km by river above Prendergast Mill River Station · 2025: 180 spills, 2,282 h
Between Prendergast Mill River Station and Haverfordwest River Station1 overflow
Perrots Road Island Storm OverflowNot discharging Dwr Cymru Welsh Water · into Western Cleddau · 130 m by river above Haverfordwest River Station · 2025: 63 spills, 133 h
Near these gauges, connection not known
Within 3 km of one of the Western Cleddau’s gauges in a straight line, but the river map cannot say whether their water reaches it.
Quay Street Haverfordwest Storm OverflowNot discharging Dwr Cymru Welsh Water · into Tidal Waters Of The Western Cleddau · 340 m from Haverfordwest River Station in a straight line · discharges to the sea, an estuary or tidal water · 2025: 56 spills, 93 h
Picton Place Storm OverflowNot discharging Dwr Cymru Welsh Water · into Tidal Waters Of The Western Cleddau · 660 m from Haverfordwest River Station in a straight line · discharges to the sea, an estuary or tidal water · 2025: 106 spills, 1,564 h
Union Hill Storm OverflowNot discharging Dwr Cymru Welsh Water · into Western Cleddau · 660 m from Haverfordwest River Station in a straight line · discharges into a tidal reach, where the water moves both ways · 2025: 84 spills, 126 h
Kensington Gardens Haverfordwest Storm OverflowNot discharging Dwr Cymru Welsh Water · into St Martins Brook · 800 m from Haverfordwest River Station in a straight line · its watercourse is not on the river map · 2025: 4 spills, 1.0 h
Portfield Storm OverflowNot discharging Dwr Cymru Welsh Water · into Western Cleddau · 800 m from Haverfordwest River Station in a straight line · its watercourse is not on the river map · 2025: 66 spills, 68 h
Crundale Storm OverflowNot discharging Dwr Cymru Welsh Water · into Cartlett Brook · 1.1 km from Prendergast Mill River Station in a straight line · not connected to this gauge on the river map · 2025: 63 spills, 650 h
Merlins Bridge WwTW Storm OverflowNot discharging Dwr Cymru Welsh Water · into Cleddau River · 1.5 km from Haverfordwest River Station in a straight line · its recorded watercourse is not the one mapped beside it · 2025: 72 spills, 512 h
Spittal WwTW Storm OverflowDischarging now since Dwr Cymru Welsh Water · into Tributary Of Rudbaxton Water · 2.2 km from Treffgarne River Station in a straight line · its watercourse is not on the river map · 2025: 108 spills, 1,437 h
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