River Gelyn · Afon Gelyn
The only gauge on the River Gelyn 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 Gelyn on the live map →Every gauge on the River Gelyn, right now
| Gauge | km above the mouth |
Level now |
Against its record |
Percentile | Trend |
|---|---|---|---|---|---|
| Cynefailnear Llidiardau | 2 | 0.41 m | Normal | 85th | ▬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 Gelyn
About this river
From its highest reach down to its mouth near Llidiardau, the Afon Gelyn runs 6 km. Its gauge holds 42 years of readings, and that is what today's level is compared with.
- Cynefail - a rain gauge near Llidiardau, not a river level
This is not a flood-warning service. For flood warnings in Wales go to
Natural Resources Wales; in England, the
Environment Agency. In an emergency
call 999. The map cannot see the sea, surface water, drains, or any one address.