Live levels from 4 monitoring stations across Cornwall, updated every 15 minutes.
| Station | Level now | Status | ||
|---|---|---|---|---|
| Trenear | 0.36 m 43m ago | Normal | ||
| 330 m by river | ||||
| Boscadjack | 0.28 m 43m ago | Normal | ||
| 4.7 km by river | ||||
| Helston County Bridge | 0.18 m 43m ago | Low | ||
| 2.0 km by river | ||||
| Loe Pool | 3.55 m 43m ago | Normal | ||
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 Cober 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.
No gauged tributary joins the Cober above Loe Pool on the river map. Streams without a gauge are not counted here.
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.
5 storm overflows are traced upstream of Loe Pool, the Cober’s lowest gauge on the river map: on the Cober itself, on its gauged tributaries, and on smaller streams that join above there.
Official figures for 2025, for the overflows traced upstream of Loe Pool: 98 spills over 409 hours in total, across all 5.
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 Cober includes the smaller streams that join it there.
Within 3 km of one of the Cober’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.
24 sampling points on the River Cober and the streams that join it above Loe Pool. 16 have a sample from the last 12 months; 16 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) |
|---|---|---|---|---|
| Cober Waterbody Background Site 2 | River Cober | 5.6 km | Last sampled 13 Jan 2011, before the imported period | |
| River Cober at Burras Bridge | River Cober | 5.5 km | 15 Dec 2025 · 10 months ago | Oxygen 99.2%Temp 10.6 °CpH 6.39Ammonia 0.23 mg/l |
| Halwin Stream at confluence with Medlyn Stream | unnamed stream | 4.4 km | 22 Sep 2026 · 16 days ago | Oxygen 92.9%Temp 16.9 °CpH 7.1Conductivity 128 µS/cm |
| Medlyn Stream at Gweal-An-Deebles | unnamed stream | 4.1 km | 22 Sep 2026 · 16 days ago | Oxygen 94.3%Temp 16.6 °CpH 7.2Conductivity 130 µS/cm |
| River Cober at Porkellis | River Cober | 3.6 km | 22 Sep 2026 · 16 days ago | Oxygen 95.7%Temp 15.2 °CpH 6.61Conductivity 156 µS/cm |
| Medlyn Stream at Chy Bridge | unnamed stream | 2.7 km | 22 Sep 2026 · 16 days ago | Oxygen 92.6%Temp 16.2 °CpH 7Conductivity 130 µS/cm |
| Tributary of Bodilly Stream downstream of Releath Farm | unnamed stream | 2.4 km | Last sampled 16 Mar 2016, before the imported period | |
| Bodilly Stream at Bodilly Mill | unnamed stream | 1.2 km | Last sampled 10 Sep 2013, before the imported period | |
| River Cober at Trenear Bridge | River Cober | 0.7 km | 22 Sep 2026 · 16 days ago | Oxygen 94.4%Temp 15.6 °CpH 7Conductivity 140 µS/cm |
| Bodilly Stream upstream of Cober confluence | River Cober | 0.2 km | Last sampled 16 Mar 2016, before the imported period | |
| River Cober at Wendron | River Cober | 0.2 km | 20 Jul 2026 · 3 months ago | Oxygen 100.2%Temp 18.3 °CpH 7.47Ammonia 4 mg/l |
| Sampling point | Watercourse (map) | Above the gauge | Last sample | Latest results (river water) |
|---|---|---|---|---|
| Mellangoose Stream at Trevarno Estate | unnamed stream | 4.2 km | 7 Jul 2026 · 3 months ago | Oxygen 97.3%Temp 14.4 °CpH 6.9Conductivity 238 µS/cm |
| River Cober at Coverack Bridge | River Cober | 3.8 km | Last sampled 16 Mar 2016, before the imported period | |
| Mellangoose Stream upstream of Truthall Wood tributary | unnamed stream | 2.9 km | 7 Jul 2026 · 3 months ago | Oxygen 96.9%Temp 16.5 °CpH 7.2Conductivity 239 µS/cm |
| River Cober at Lowertown Bridge | River Cober | 2.1 km | 15 Sep 2026 · 23 days ago | Oxygen 102% Jul 2026Oxygen 10.7 mg/l May 2026Temp 16.4 °CpH 7.1 Jul 2026 |
| Mellangoose Stream Prior to Cober | unnamed stream | 1.9 km | 7 Jul 2026 · 3 months ago | Oxygen 98.8%Temp 16.1 °CpH 7.1Conductivity 236 µS/cm |
| River Cober at St Johns Bridge | River Cober | 0.3 km | 29 Sep 2026 · 9 days ago | Oxygen 98.1%Temp 15.8 °CpH 7.32Ammonia below 0.03 mg/l |
| Sampling point | Watercourse (map) | Above the gauge | Last sample | Latest results (river water) |
|---|---|---|---|---|
| River Cober at Helston Park G Station | River Cober | 1.8 km | 7 Jul 2026 · 3 months ago | Oxygen 96.5% Jul 2024Temp 15.9 °CpH 7.1Ammonia 0.032 mg/l |
| River Cober upstream of Helston sewage treatment works | River Cober | 1.5 km | 29 Sep 2026 · 9 days ago | Oxygen 97.2%Temp 15.9 °CpH 7.37Ammonia below 0.03 mg/l |
| River Cober upstream of sewage treatment works Discharge, downstream of Pond | River Cober | 1.4 km | Last sampled 26 Nov 2015, before the imported period | |
| River Cober downstream of Helston sewage treatment works | River Cober | 1.3 km | Last sampled 13 Mar 2020, before the imported period | |
| Tributary of Cober from Penventon Farm | River Cober | 1.3 km | Last sampled 16 Mar 2016, before the imported period | |
| River Cober 200 m downstream of Helston sewage treatment works | River Cober | 1.2 km | 7 Jul 2026 · 3 months ago | pH 7.15 |
| River Cober at Inflow to Loe Pool | River Cober | 0.7 km | 10 Aug 2026 · 59 days ago | Oxygen 93.6%Temp 17.8 °CpH 7.54Ammonia 0.037 mg/l |
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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