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2 gauges. None is above its typical high. 1 storm overflow upstream is discharging now. Gauges in Carmarthenshire, Neath Port Talbot; levels are checked every 15 minutes.
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| Station | Level now | Status |
|---|---|---|
| Gurnos River Stationplace estimated | 0.68 m 17m ago | Within its typical range |
| Station | Level now | Status |
|---|---|---|
| Ddol Las River Stationplace estimated | 0.58 m 17m ago | Within its typical range |
Stations are listed from source to mouth as the water flows, traced on the river map (OS Open Rivers) and the Environment Agency’s own links between its gauges. A distance “by river” is along the river, and is shown only where the map traces the path.
Contains OS data © Crown copyright and database rights 2026.
Streams and rivers with a gauge whose water joins the Twrch above one of its gauges, from the source down. Named streams without a gauge that have a page here are listed at the end.
No gauged tributary joins the Twrch above Gurnos River Station on the river map. Streams without a gauge are not counted here.
Below Gurnos River Station, its water next reaches Ynystanglws River Station, a gauge on River Tawe, 15.4 km by river downstream.
No gauged tributary joins the Twrch above Ddol Las River Station on the river map. Streams without a gauge are not counted here.
Below Ddol Las River Station, its water next reaches Ty Castell River Station, a gauge on Tywi, 40.5 km by river downstream.
Tributaries and where they join are traced on the river map (OS Open Rivers, edition 2026-04) and the Environment Agency’s links between its gauges. The map holds distances between gauges, not the junctions themselves, so a junction is placed between two gauges, and no further up than the tributary’s own lowest gauge. Contains OS data © Crown copyright and database rights 2026.
8 storm overflows are traced upstream of Gurnos River Station, the Twrch’s lowest gauge on the river map: on the Twrch itself, on its gauged tributaries, and on smaller streams that join above there.
Official figures for 2025, for the overflows traced upstream of Gurnos River Station: 466 spills over 3,570 hours in total, across all 8.
Each overflow is listed in the stretch above the first gauge its water reaches, from the source down, as on the Gauges tab. A stretch of the Twrch includes the smaller streams that join it there.
Within 3 km of one of the Twrch’s gauges in a straight line, but the river map cannot say whether their water reaches it.
7 other overflows within 3 km of these gauges are placed below the Twrch’s lowest gauge or on another river, so not listed.
1 storm overflow is traced upstream of Ddol Las River Station, the Twrch’s lowest gauge on the river map: on the Twrch itself, on its gauged tributaries, and on smaller streams that join above there.
Official figures for 2024, for the overflow traced upstream of Ddol Las River Station: 80 spills over 989 hours.
Each overflow is listed in the stretch above the first gauge its water reaches, from the source down, as on the Gauges tab. A stretch of the Twrch includes the smaller streams that join it there.
A status is the water company’s own monitor: it says whether an overflow is discharging, never how much or why, and a spill does not by itself explain a change in a river level. A status older than two hours is shown as unknown. Annual figures are the official returns: 12/24-hour spills for England and Wales, overflow events for Scotland (Scottish Water counts differently, so the two cannot be compared). “No data” means the monitor produced no usable data that year, not zero. Overflows are placed on OS Open Rivers (edition 2026-04), which leaves out many small channels: an overflow the map cannot place may still drain here. Contains OS data © Crown copyright and database rights 2026. Sewage in Britain’s rivers →
Live status: © Dŵr Cymru Welsh Water, from its Storm Overflow Map. Annual figures for Wales: Dŵr Cymru Welsh Water’s return to Natural Resources Wales, as compiled by The Rivers Trust, Open Government Licence.
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