River Cynon · Afon Cynon

All four gauges on the River Cynon are normal.

Read from 4 river-level gauges at 12:00 on 28 October 2026 GMT, and read again every fifteen minutes.

See the River Cynon on the live map →

Every gauge on the River Cynon, right now

Gauge km above
the mouth		 Level
now		 Against
its record		 Percentile Trend
Hirwaunnear Pen-y-waun 19 0.26 m Normal 54th ▬steady
Aberdarenear Aber-nant 12 0.29 m Normal 59th ▼falling
Mountain Ashnear Darranlas 6 0.87 m Normal 79th ▬steady
Abercynonnear Pontcynon 1 0.54 m Normal 80th ▬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 Cynon

normalHirwaun River StationAberdare River StationMountain Ash River StationAbercynon River StationHirwaunAberdareMountain AshAbercynonWhere it is in Wales
The course of the River Cynon, 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 Abercynon, the Afon Cynon runs 21 km. Its gauges hold between 9 and 37 years of readings, and that is what today's levels are compared with.

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.