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1 gauge, at Pothouse Wharf River Station. 9 storm overflows upstream are discharging now. Gauges in Carmarthenshire; levels are checked every 15 minutes.
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| Station | Level now | Status |
|---|---|---|
| Pothouse Wharf River Stationtidal | 4.02 m 18m ago | Within its typical range |
Also on the Tywi by the river map, but filed under another river name: Ystradffin No2 River Station, Dolau Hirion River Station, Manorafon River Station, Ty Castell River Station and Capel Dewi River Station.
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 Tywi above one of its gauges, from the source down. Named streams without a gauge that have a page here are listed at the end.
Joins the Tywi above Pothouse Wharf River Station, its highest gauge, no more than 5.4 km by river above Pothouse Wharf River Station.
| Glan Gwili River Station | 1.32 m 18m ago | Within its typical range |
Its water passes every gauge on the Tywi, from Pothouse Wharf River Station down.
Joins the Tywi above Dolau Hirion River Station, no more than 15.8 km by river above Dolau Hirion River Station.
| Doethie Craig Clungwyn | 0.76 m 1h ago | Within its typical range |
Its water passes Dolau Hirion River Station.
Joins the Tywi above Manorafon River Station, no more than 20.7 km by river above Manorafon River Station.
| Llandovery River Station | 0.70 m 18m ago | Within its typical range |
Its water passes Manorafon River Station.
Joins the Tywi above Manorafon River Station, no more than 13.2 km by river above Manorafon River Station.
| Llanwrda River Station | 0.69 m 33m ago | Within its typical range |
Its water passes Manorafon River Station.
Joins the Tywi above Manorafon River Station, no more than 21.6 km by river above Manorafon River Station.
| Pont Velindre River Station | 0.85 m 18m ago | Within its typical range |
Its water passes Manorafon River Station.
Joins the Tywi above Manorafon River Station, no more than 11.1 km by river above Manorafon River Station.
| Felin Y Cwm River Station | 0.59 m 33m ago | Within its typical range |
Its water passes Manorafon River Station.
Joins the Tywi above Ty Castell River Station, no more than 4.3 km by river above Ty Castell River Station.
| Felin Mynachdy River Station | 1.45 m 18m ago | Within its typical range |
Its water passes Ty Castell River Station.
Joins the Tywi above Ty Castell River Station, no more than 40.5 km by river above Ty Castell River Station.
| Ddol Las River Station | 0.58 m 18m ago | Within its typical range |
Its water passes Ty Castell River Station.
No gauge below Pothouse Wharf River Station is known on the river map.
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.
35 storm overflows are traced upstream of Pothouse Wharf River Station, the Tywi’s lowest gauge on the river map: on the Tywi itself, on its gauged tributaries, and on smaller streams that join above there.
Official figures for 2025, for the overflows traced upstream of Pothouse Wharf River Station: 2,348 spills over 25,707 hours in total, across the 27 that have a figure. 8 have no 2025 figure.
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 Tywi includes the smaller streams that join it there. Where a stretch or a tributary has more than 4, the 3 discharging now or nearest its gauge are listed, the rest are counted, and every one is in that gauge’s “Upstream of here” list. Show every overflow in every stretch →
and 5 more: show all 8 overflows on this stretch → All above Glan Gwili River Station, nearest first →
and 13 more: show all 16 overflows on this stretch → All above Ty Castell River Station, nearest first →
and 2 more: show all 5 overflows on this stretch → All above Manorafon River Station, nearest first →
Within 3 km of one of the Tywi’s gauges in a straight line, but the river map cannot say whether their water reaches it.
8 more near these gauges whose connection is not known.
7 other overflows within 3 km of these gauges are placed below the Tywi’s lowest gauge or on another river, so not listed.
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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