River Sirhowy · Afon Sirhywi
Both gauges on the River Sirhowy are normal.
Read from 2 river-level gauges at 12:00 on 28 October 2026 GMT, and read again every fifteen minutes.
See the River Sirhowy on the live map →Every gauge on the River Sirhowy, right now
| Gauge | km above the mouth |
Level now |
Against its record |
Percentile | Trend |
|---|---|---|---|---|---|
| Nant Y Bwchnear Tynewydd | 29 | 0.30 m | Normal | 81st | ▬steady |
| Ynysddunear Ynys-ddu | 6 | 0.46 m | Normal | 69th | ▼falling |
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 Sirhowy
About this river
From its highest reach down to its mouth near Glenside, the Afon Sirhywi runs 29 km. The course above is drawn in two weights: the bright line is where Ordnance Survey Open Rivers calls the channel the Afon Sirhywi, and the faint line, about 1 km of it, is the same water running under another name, past a lake or a weir pool. Its gauges hold between 17 and 21 years of readings, and that is what today's levels are compared with.