River Irfon

Both gauges on the River Irfon are normal and steady.

Read from 2 river-level gauges at 12:00 on 28 October 2026 GMT, and read again every fifteen minutes.

Every gauge on the River Irfon, right now

Gauge	km above the mouth	Level now	Against its record	Percentile	Trend
Abernantnear Llanwrtyd Wells (Llanwrtyd)	21	0.71 m	Normal	83rd	▬steady
Cilmerynear Cilmeri	6	0.85 m	Normal	83rd	▬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 Irfon

Where it is in Wales

The course of the River Irfon, drawn from Ordnance Survey Open Rivers. Each gauge is coloured by where its level sits today. A grey dot is a gauge we do not rank, and a hollow ring is one that is not reporting. North is up.

About this river

From its highest reach down to its mouth near Builth Wells (Llanfair-ym-Muallt), the Irfon runs 39 km. Its gauges hold between 21 and 31 years of readings, and that is what today's levels are compared with.

Abernant - a rain gauge near Llanwrtyd Wells (Llanwrtyd), 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.