River Vyrnwy · Afon Efyrnwy
All four gauges on the River Vyrnwy are normal.
Read from 4 river-level gauges at 12:00 on 28 October 2026 GMT, and read again every fifteen minutes.
See the River Vyrnwy on the live map →Every gauge on the River Vyrnwy, right now
| Gauge | km above the mouth |
Level now |
Against its record |
Percentile | Trend |
|---|---|---|---|---|---|
| Vyrnwy Weirnear Llanwddynregulated | 65 | 0.26 mASD | Normal | 66th | ▬steady |
| Pont Robertnear Pontrobert | 47 | 1.44 mASD | Normal | 85th | ▲rising |
| Meifodnear Newbridge | 40 | 1.41 m | Normal | 83rd | ▲rising |
| Llanymynechnear Four Crosses (Llandysilio) | 18 | 2.37 mASD | Normal | 91st | ▬steady |
The percentile is where a gauge's latest reading sits in its own record of readings, not how full the channel is. A river sits low most of the time, so a high percentile takes surprisingly little water: at Beddgelert on the Glaslyn, with thirty-six years of record, the ninety-fourth percentile is about 1.05 m - 1.38 m below the highest level ever recorded there.
The course of the River Vyrnwy
About this river
From its highest reach down to its mouth near Crew Green, the Afon Efyrnwy runs 65 km. The course above is drawn in two weights: the bright line is where Ordnance Survey Open Rivers calls the channel the Afon Efyrnwy, and the faint line, about 31 km of it, is the same water running under another name, past a lake or a weir pool. Its gauges hold between 17 and 53 years of readings, and that is what today's levels are compared with.
- Vyrnwy - a rain gauge near Llanwddyn, not a river level