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1 gauge, at Llanymynech River Station. It is not above its typical high. Gauges in Powys; levels are checked every 15 minutes.
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| Station | Level now | Status |
|---|---|---|
| Llanymynech River Station | 2.67 m 36m ago | Within its typical range |
Also on the Vyrnwy by the river map, but filed under another river name: Vyrnwy Weir River Station, Pont Robert River Station and Meifod River Station.
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.
Streams and rivers with a gauge whose water joins the Vyrnwy above one of its gauges, from the source down. Named streams without a gauge that have a page here are listed at the end.
Joins the Vyrnwy above Llanymynech River Station, its highest gauge, no more than 8.4 km by river above Llanymynech River Station.
| Llanfyllin Cain River Station | 0.42 m 21m ago | Within its typical range |
| 10.1 km by river | ||
| Llansantffraid River Station | 1.00 m 21m ago | Within its typical range |
Its water passes every gauge on the Vyrnwy, from Llanymynech River Station down.
Joins the Vyrnwy above Llanymynech River Station, its highest gauge, no more than 5.9 km by river above Llanymynech River Station.
| Llanyblodwel | 0.70 m 36m ago | Within its typical range |
Its water passes every gauge on the Vyrnwy, from Llanymynech River Station down.
Joins the Vyrnwy above Meifod River Station, no more than 23.1 km by river above Meifod River Station.
| Llanerfyl River Station | 1.41 m 36m ago | Within its typical range |
Its water passes Meifod River Station.
Below Llanymynech River Station, its water next reaches Crew Green, a gauge on River Severn, 18.5 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.
11 storm overflows are traced upstream of Llanymynech River Station, the Vyrnwy’s lowest gauge on the river map: on the Vyrnwy itself, on its gauged tributaries, and on smaller streams that join above there.
Official figures for 2025, for the overflows traced upstream of Llanymynech River Station: 247 spills over 2,537 hours in total, across all 11.
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 Vyrnwy includes the smaller streams that join it there.
1 other overflow within 3 km of these gauges is placed below the Vyrnwy’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: © Hafren Dyfrdwy storm overflow activity data, licensed under CC BY 4.0. Annual figures for Wales: Dŵr Cymru Welsh Water’s return to Natural Resources Wales, as compiled by The Rivers Trust, Open Government Licence.
Dated samples taken by the Environment Agency, not live readings. Results are published days to months after the sample is taken, and many points are sampled only a few times a year, or have not been sampled for years.
5 sampling points on the Vyrnwy and the streams that join it above Llanymynech River Station, and below it. 2 have a sample from the last 12 months; 4 have any sample banked. Listed from the source down, grouped by the next gauge each one's water reaches.
| Sampling point | Watercourse (map) | Above the gauge | Last sample | Latest results (river water) |
|---|---|---|---|---|
| Cynllaith at Rhydycroesau | Cynllaith | 16 km | 21 Dec 2023 · 2.9 years ago | Oxygen 102.6%Temp 9.2 °CpH 7.92Ammonia 0.039 mg/l |
| River Avon Tanat at Llanblodwel | Afon Tanat | 1.3 km | 10 Sep 2026 · 47 days ago | Oxygen 102.4%Temp 13.3 °CpH 8.01Ammonia below 0.03 mg/l |
| Nant Mawr Brook confluence | unnamed stream | 0.8 km | Last sampled 27 Apr 2017, before the imported period |
| Sampling point | Watercourse (map) | Below the gauge | Last sample | Latest results (river water) |
|---|---|---|---|---|
| Vyrnwy at Hendre | Afon Efyrnwy | 15 km | 10 Oct 2025 · 13 months ago | Oxygen 95.4%Temp 12.5 °CpH 7.93Ammonia below 0.03 mg/l |
| River Vyrnwy - Melverley Chur | Afon Efyrnwy | 17 km | 22 Sep 2026 · 35 days ago | Oxygen 98.4% Apr 2026Temp 10.2 °C Apr 2026pH 7.67 Apr 2026Ammonia below 0.03 mg/l Apr 2026 |
Distances are along the river to the gauge named. England's samples only.
FloodRadar does not grade these results: there is no overall score, and official river classifications are a separate dataset. A sample taken downstream of an overflow does not by itself show where anything in it came from. River connections and distances are traced on OS Open Rivers (edition 2026-04), which leaves out many small channels.
Water samples: Environment Agency Water Quality Archive, © Environment Agency and/or database right 2026, Open Government Licence v3.0.
Contains OS data © Crown copyright and database rights 2026.
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