River Glaslyn · Afon Glaslyn
The only gauge on the River Glaslyn is normal and steady.
Read from one river-level gauge at 12:00 on 28 October 2026 GMT, and read again every fifteen minutes.
See the River Glaslyn on the live map →Every gauge on the River Glaslyn, right now
| Gauge | km above the mouth |
Level now |
Against its record |
Percentile | Trend |
|---|---|---|---|---|---|
| Beddgelertnear Nantmor | 16 | 0.95 m | 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 Glaslyn
About this river
From its highest reach down to its mouth near Borth-y-Gest, the Afon Glaslyn runs 31 km. The lowest 2 km are tidal, where a gauge reads the tide as much as the river. The course above is drawn in two weights: the bright line is where Ordnance Survey Open Rivers calls the channel the Afon Glaslyn, and the faint line, about 13 km of it, is the same water running under another name, past a lake or a weir pool. Its gauge holds 36 years of readings, and that is what today's level is compared with.