The Clam name from the river map
Joins the Yealm above Puslinch, no more than 10 m by river above Puslinch.
| PUSLINCH | 0.27 m3/s 1h ago | — |
Its water passes Puslinch and every gauge below it on the Yealm.
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Live levels from 2 monitoring stations across Devon, updated every 15 minutes.
| Station | Level now | Status | ||
|---|---|---|---|---|
| Cornwood | 0.12 m 1h ago | Normal | ||
| 11.5 km by river | ||||
| Puslinch | 0.20 m 1h ago | Low | ||
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 Yealm 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 Yealm above Puslinch, no more than 10 m by river above Puslinch.
| PUSLINCH | 0.27 m3/s 1h ago | — |
Its water passes Puslinch and every gauge below it on the Yealm.
No gauge below Puslinch 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.
10 storm overflows are traced upstream of Puslinch, the Yealm’s lowest gauge on the river map: on the Yealm itself, on its gauged tributaries, and on smaller streams that join above there.
Official figures for 2025, for the overflows traced upstream of Puslinch: 454 spills over 4,122 hours in total, across all 10.
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 Yealm includes the smaller streams that join it there.
Within 3 km of one of the Yealm’s gauges in a straight line, but the river map cannot say whether their water reaches it.
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: © South West Water storm overflow activity data, licensed under CC BY 4.0. Annual figures for England: Environment Agency Event Duration Monitoring return, © Environment Agency copyright and/or database right, Open Government Licence v3.0.
Dated samples taken by the Environment Agency, not live readings. Results are published days to months after the sample is taken, and many points are sampled only a few times a year, or have not been sampled for years.
17 sampling points on the River Yealm and the streams that join it above Puslinch, and below it. 7 have a sample from the last 12 months; 9 have any sample banked. Listed from the source down, grouped by the next gauge each one's water reaches.
| Sampling point | Watercourse (map) | Above the gauge | Last sample | Latest results (river water) |
|---|---|---|---|---|
| River Yealm at Hele Cross | River Yealm | 1.8 km | 17 Sep 2026 · 21 days ago | Oxygen 100.8%Temp 14.7 °CpH 6.88Ammonia below 0.03 mg/l |
| Sampling point | Watercourse (map) | Above the gauge | Last sample | Latest results (river water) |
|---|---|---|---|---|
| River Piall at Quick Bridge | Piall River | 13 km | Last sampled 6 Sep 2005, before the imported period | |
| Piall at Piall Bridge | Piall River | 12 km | Last sampled 15 May 2009, before the imported period | |
| Piall at Almshouse Bridge | Piall River | 11 km | 21 May 2026 · 5 months ago | Oxygen 100%Temp 13.2 °CpH 6.85Ammonia below 0.03 mg/l |
| River Piall at Slade Bridge | Piall River | 10 km | 12 Mar 2024 · 2.6 years ago | Oxygen 99.1%Temp 10.3 °CpH 7.03Ammonia below 0.03 mg/l |
| River Yealm at Fardel Mill Farm Bridge | River Yealm | 8.5 km | 17 Sep 2026 · 21 days ago | Oxygen 96.9% May 2026Temp 15.3 °CpH 6.95 May 2026Ammonia below 0.03 mg/l |
| River Piall at Marks Bridge | Piall River | 8.4 km | 17 Sep 2026 · 21 days ago | Oxygen 99.2% May 2026Temp 14.8 °CpH 7.34 May 2026Ammonia below 0.03 mg/l |
| River Yealm downstream of Piall/Ridgecot Lake | River Yealm | 8.2 km | Last sampled 8 Dec 2006, before the imported period | |
| River Yealm at Lee Mill Bridge | River Yealm | 6.7 km | Last sampled 21 Feb 2018, before the imported period | |
| River Yealm downstream of Lee Mill Industrial Estate sewage treatment works | River Yealm | 6.1 km | 27 Jul 2026 · 2 months ago | pH 7.33 |
| Long Brook at Luson | Long Brook | 6.0 km | 14 Jan 2026 · 9 months ago | Oxygen 98.7%Temp 8.9 °CpH 7.71Ammonia below 0.03 mg/l |
| Brook Lake at Swainstone Cross - Brook Lake | Brook Lake | 5.3 km | 18 Dec 2024 · 22 months ago | Oxygen 97.7%Temp 11.5 °CpH 7.96Ammonia 0.011 mg/l |
| River Yealm at Popple's Bridge | River Yealm | 5.1 km | Last sampled 28 Aug 2018, before the imported period | |
| Long Brook at Yealm Bridge | Long Brook | 2.6 km | Last sampled 10 Mar 2020, before the imported period | |
| River Yealm at Yealm Bridge | River Yealm | 2.2 km | 9 Sep 2026 · 29 days ago | Oxygen 98.7%Temp 14.8 °CpH 7.4Ammonia below 0.03 mg/l |
| River Yealm downstream of Yealmpton sewage treatment works | The Clam | 0.3 km | Last sampled 12 Dec 2006, before the imported period |
| Sampling point | Watercourse (map) | Below the gauge | Last sample | Latest results (river water) |
|---|---|---|---|---|
| River Yealm at Puslinch Bridge | River Yealm | 0.4 km | Last sampled 2 Dec 2021, before the imported period |
Distances are along the river to the gauge named. England's samples only.
FloodRadar does not grade these results: there is no overall score, and official river classifications are a separate dataset. A sample taken downstream of an overflow does not by itself show where anything in it came from. River connections and distances are traced on OS Open Rivers (edition 2026-04), which leaves out many small channels.
Water samples: Environment Agency Water Quality Archive, © Environment Agency and/or database right 2026, Open Government Licence v3.0.
Contains OS data © Crown copyright and database rights 2026.
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