River Alun · Afon Alun
All five gauges on the River Alun are normal.
Read from 5 river-level gauges at 12:00 on 28 October 2026 GMT, and read again every fifteen minutes.
See the River Alun on the live map →Every gauge on the River Alun, right now
| Gauge | km above the mouth |
Level now |
Against its record |
Percentile | Trend |
|---|---|---|---|---|---|
| Pont Y Capelnear Blue Bell Estate | 60 | 0.27 m | Normal | 35th | ▬steady |
| Rossettnear Marford | 55 | 0.23 m | Normal | 53rd | ▬steady |
| Rhyd Y Mwyn DLnear Rhyd-y-mwyn | - | 0.21 m | Normal | 57th | ▬steady |
| Pont Blyddynnear Pontblyddyn | - | 0.62 m | Normal | 50th | ▲rising |
| Mold Leadmill Bridgenear Ponterwyl | - | 0.08 m | Normal | 35th | ▬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. A hyphen in the first column means the reach that gauge stands on has no path to the sea in Ordnance Survey Open Rivers - a lake, a culverted stretch or the edge of the mapped area can interrupt a channel - so there is no distance down the river to measure.
The course of the River Alun
About this river
From its highest reach down to its mouth near Merthyr Mawr, the Afon Alun runs 70 km. The course above is drawn in two weights: the bright line is where Ordnance Survey Open Rivers calls the channel the Afon Alun, and the faint line, about 27 km of it, is the same water running under another name, past a lake or a weir pool. Its gauges hold between 1 and 49 years of readings, and that is what today's levels are compared with.
- Loggerheads - a rain gauge near Cadole, not a river level
- Mold - a rain gauge near Pentre, not a river level