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1 gauge, at Beddgelert River Station. It is not above its typical high. No storm overflow upstream is discharging now. Gauges in Gwynedd; levels are checked every 15 minutes.
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| Station | Level now | Status |
|---|---|---|
| Beddgelert River Station | 1.07 m 32m 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 Glaslyn above one of its gauges, from the source down. The river map knows where gauges are, not every stream, so a tributary without a gauge is not listed here.
Joins the Glaslyn above Beddgelert River Station, its highest gauge, no more than 3.7 km by river above Beddgelert River Station.
| Afon Colwyn River Station | 0.22 m 17m ago | Within its typical range |
Its water passes every gauge on the Glaslyn, from Beddgelert River Station down.
No gauge below Beddgelert 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.
1 storm overflow is traced upstream of Beddgelert River Station, the Glaslyn’s lowest gauge on the river map: on the Glaslyn itself, on its gauged tributaries, and on smaller streams that join above there.
Official figures for 2025, for the overflow traced upstream of Beddgelert River Station: 59 spills over 439 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 Glaslyn includes the smaller streams that join it there.
1 other overflow within 3 km of these gauges is placed below the Glaslyn’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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