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Alun water levels

5 gauges from Rhyd Y Mwyn DL River Station to Rossett River Station. None of the 4 that can be compared with a typical high is above it. Gauges in Flintshire, Wrexham; levels are checked every 15 minutes.

5gauges
0above normal

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Gauges

Monitoring stations, source to mouth

StationTownLevel nowStatusTrend
Rhyd Y Mwyn DL River Stationtidal—0.20 m 32m agoWithin its typical range—
Mold Leadmill Bridge River Station 4.8 km by river—0.09 m 32m agoWithin its typical range—
Pont Blyddyn River Station 6.7 km by river—0.64 m 32m agoWithin its typical range—
Pont Y Capel River Station 12.8 km by river—0.31 m 32m agoWithin its typical range—
Rossett River Station 5.1 km by riverRossett0.25 m 17m 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 Alun 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 Alun above Rossett River Station on the river map. Streams without a gauge are not counted here.

Where the Alun goes

Below Rossett River Station, its water next reaches Ironbridge River Station, a gauge on Dee, 12.2 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 Alun 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

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

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

Official figures for 2025, for the overflows traced upstream of Rossett River Station: 385 spills over 1,533 hours in total, across the 28 that have a figure. 2 have 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 Alun includes the smaller streams that join it there.

Above Rhyd Y Mwyn DL River Station, the Alun’s highest gauge3 overflows
  • Off Church Terrace Llandegla Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into River Alyn · 20.0 km by river above Rhyd Y Mwyn DL River Station · 2025: 5 spills, 14 h
  • Llanarmon Yn Ial WwTW Overflow Not discharging
    Dwr Cymru Welsh Water · into River Alyn · 15.4 km by river above Rhyd Y Mwyn DL River Station · 2025: 59 spills, 178 h
  • Llanferres Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Tributary Of Afon Alun · 9.2 km by river above Rhyd Y Mwyn DL River Station · 2025: 6 spills, 59 h
Between Rhyd Y Mwyn DL River Station and Mold Leadmill Bridge River Station1 overflow
  • Maes Y Dre Mold Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into River Alyn · 360 m by river above Mold Leadmill Bridge River Station · 2025: 4 spills, 2.0 h
Between Mold Leadmill Bridge River Station and Pont Blyddyn River Station9 overflows
  • Bryn Awelon Mold Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Tributary Of Black Brook · 6.8 km by river above Pont Blyddyn River Station · 2025: 12 spills, 68 h
  • Milford Street And Bro Alun Mold Overflow Not discharging
    Dwr Cymru Welsh Water · into River Alyn · 6.8 km by river above Pont Blyddyn River Station · 2025: 18 spills, 14 h
  • Bryn Coch Lane Mold Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Unnamed Tributary Of Afon Alyn · 6.4 km by river above Pont Blyddyn River Station · 2025: 0 spills, 0 h
  • Victoria Terrace Mold Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into River Alyn · 6.3 km by river above Pont Blyddyn River Station · 2025: 4 spills, 3.3 h
  • Fford Argoed Fields Storm Overflow Monitor offline
    Dwr Cymru Welsh Water · into River Alyn · 6.0 km by river above Pont Blyddyn River Station · 2025: 3 spills, 0.8 h
  • Gas Lane Mold Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Unnamed Tributary Of Afon Alyn · 5.7 km by river above Pont Blyddyn River Station · 2025: 10 spills, 5.0 h
  • Bromfield Lane Mold Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Tributary Of Afon Alyn · 5.2 km by river above Pont Blyddyn River Station · 2025: 17 spills, 14 h
  • Mold WwTW Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Tributary Of Afon Alyn · 5.0 km by river above Pont Blyddyn River Station · 2025: 56 spills, 359 h
  • Pontblyddyn Dingle Road Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into River Alyn · 320 m by river above Pont Blyddyn River Station · 2025: 3 spills, 27 h
Between Pont Blyddyn River Station and Pont Y Capel River Station15 overflows
  • Pontybodkin Main Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Nant Byr · 14.2 km by river above Pont Y Capel River Station · 2025: 1 spill, 0.8 h
  • Buckley Ty Gwyn Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Black Brook · 14.1 km by river above Pont Y Capel River Station · 2025: 18 spills, 127 h
  • Pont Y Bodkin Lower Storm Overflow Monitor offline
    Dwr Cymru Welsh Water · into Byr Brook · 14.0 km by river above Pont Y Capel River Station · 2025: 17 spills, 272 h
  • Corwen Road Junction Pontblyddyn Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into River Alyn · 12.7 km by river above Pont Y Capel River Station · 2025: 12 spills, 36 h
  • Ffrith Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Afon Cegidog · 8.8 km by river above Pont Y Capel River Station · 2025: 0 spills, 0 h
  • Hope WwTW Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into River Alyn · 7.9 km by river above Pont Y Capel River Station · 2025: 0 spills, 0 h
  • Sarn Lane Hope Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into River Alyn · 7.8 km by river above Pont Y Capel River Station · 2025: 3 spills, 0.8 h
  • Hope Cymau Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Afon Cegidog · 7.6 km by river above Pont Y Capel River Station · 2025: 8 spills, 6.3 h
  • Hope Street Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into River Alyn · 7.1 km by river above Pont Y Capel River Station · 2025: 1 spill, 0.3 h
  • Rhyddyn Hill Caergwrle Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into River Alyn · 6.6 km by river above Pont Y Capel River Station · 2025: 13 spills, 36 h
  • East Of Railway Cefn Y Bedd Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into River Alyn · 5.7 km by river above Pont Y Capel River Station · 2025: 34 spills, 36 h
  • Cefn Y Bedd Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into River Alyn · 4.5 km by river above Pont Y Capel River Station · 2025: 2 spills, 1.8 h
  • Cherry Tree Road Bradley Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into River Alyn · 2.2 km by river above Pont Y Capel River Station · 2025: 21 spills, 39 h
  • Pandy Overflow Not discharging
    Dwr Cymru Welsh Water · into River Alun · 770 m by river above Pont Y Capel River Station · no official annual figure
  • Pandy Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into River Alyn · 770 m by river above Pont Y Capel River Station · no official annual figure
Between Pont Y Capel River Station and Rossett River Station2 overflows

Near these gauges, connection not known

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

  • Bronallt Leeswood Storm Oveerflow Not discharging
    Dwr Cymru Welsh Water · into Unnamed Tributary Of Afon Alyn · 620 m from Pont Blyddyn River Station in a straight line · its watercourse is not on the river map · 2025: 40 spills, 404 h
  • Leeswood Bethania Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Nant Brook · 810 m from Pont Blyddyn River Station in a straight line · no mapped watercourse close enough to be sure · 2025: 3 spills, 7.3 h
  • Gladstone Street Glanrafon Road Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Unnamed Tributary Of The River Alyn · 1.0 km from Mold Leadmill Bridge River Station in a straight line · several watercourses close by, nothing to choose between them · 2025: 24 spills, 22 h
  • Wrexham Acton Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Pond Adjacent · 1.1 km from Pont Y Capel River Station in a straight line · discharges to a loch, lake or reservoir · 2025: 3 spills, 1.3 h
  • A549 Mold Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Tributary Of The Afon Alyn · 1.2 km from Mold Leadmill Bridge River Station in a straight line · no mapped watercourse close enough to be sure · 2025: 39 spills, 128 h
  • Pen Y Llyn Gwersyllt Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Gwersyllt Fishpond · 1.3 km from Pont Y Capel River Station in a straight line · its watercourse is not on the river map · 2025: 14 spills, 32 h
  • Chambers Lane Mercia Drive Junction Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Tributary Of Afon Alun · 1.5 km from Mold Leadmill Bridge River Station in a straight line · its watercourse is not on the river map · 2025: 36 spills, 76 h
  • Llay Singrett Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Singret Brook · 1.7 km from Pont Y Capel River Station in a straight line · no mapped watercourse close enough to be sure · 2025: 47 spills, 127 h
  • Chambers Lane Mercia Drive Junction Storm Overflow No2 Not discharging
    Dwr Cymru Welsh Water · into Tributary Of Afon Alyn · 1.7 km from Mold Leadmill Bridge River Station in a straight line · its watercourse is not on the river map · 2025: 48 spills, 102 h
  • Wats Duke Avenue Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Tributary Of Afon Alyn · 1.9 km from Mold Leadmill Bridge River Station in a straight line · its watercourse is not on the river map · 2025: 23 spills, 119 h
  • Mercia Drive Mold Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Surface Water Sewer · 2.0 km from Mold Leadmill Bridge River Station in a straight line · its watercourse is not on the river map · 2025: 34 spills, 81 h
  • Llay Road Llay Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Tributary Of Afon Alyn · 2.2 km from Pont Y Capel River Station in a straight line · its watercourse is not on the river map · 2025: 15 spills, 43 h
  • Padeswood Road Buckley Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Foundry Drain · 2.3 km from Pont Blyddyn River Station in a straight line · its watercourse is not on the river map · 2025: 47 spills, 387 h
  • West View Penyffordd Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Black Brook · 2.4 km from Pont Blyddyn River Station in a straight line · its watercourse is not on the river map · 2025: 0 spills, 0 h
  • Rhosnesni Lane Wrexham Overflow Not discharging
    Dwr Cymru Welsh Water · into River Gwenfro · 2.7 km from Pont Y Capel River Station in a straight line · its watercourse is not on the river map · 2025: 7 spills, 2.0 h

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