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Live levels from 3 monitoring stations across Cornwall, updated every 15 minutes.
| Station | Level now | Status | ||
|---|---|---|---|---|
| Trengune | 0.17 mASD 28m ago | Normal | ||
| 5.3 km by river | ||||
| Canworthy Water Bridge | 0.16 m 43m ago | Normal | ||
| 17.4 km by river | ||||
| Werrington | 0.10 m 43m 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 Ottery 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 Ottery above Werrington on the river map. Streams without a gauge are not counted here.
Below Werrington, its water next reaches Polson Bridge, a gauge on River Tamar, 3.8 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.
2 storm overflows are traced upstream of Werrington, the Ottery’s lowest gauge on the river map: on the Ottery itself, on its gauged tributaries, and on smaller streams that join above there.
Official figures for 2025, for the overflows traced upstream of Werrington: 170 spills over 1,656 hours in total, across all 2.
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 Ottery includes the smaller streams that join it there.
Within 3 km of one of the Ottery’s gauges in a straight line, but the river map cannot say whether their water reaches it.
5 other overflows within 3 km of these gauges are placed below the Ottery’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: © 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 Ottery and the streams that join it above Werrington, and below it. 3 have a sample from the last 12 months; 8 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 Ottery at Trengune Bridge | River Ottery | 5.3 km | Last sampled 6 Dec 2006, before the imported period |
| Sampling point | Watercourse (map) | Above the gauge | Last sample | Latest results (river water) |
|---|---|---|---|---|
| Caudworthy Water at Greenamoor Bridge | Caudworthy Water | 20 km | 5 Mar 2024 · 2.6 years ago | Oxygen 96.1%Temp 6.9 °CpH 7.15Ammonia 0.065 mg/l |
| Can Water upstream of River Ottery | unnamed stream | 18 km | Last sampled 28 Apr 2017, before the imported period | |
| River Ottery at Canworthy Water Bridge | River Ottery | 17 km | Last sampled 22 Jul 2015, before the imported period | |
| Tributary of Caudworthy Water at Middle Wheatly | unnamed stream | 17 km | 5 Mar 2024 · 2.6 years ago | Oxygen 96.1%Temp 8.4 °CpH 6.8Ammonia below 0.03 mg/l |
| Caudworthy Water at Caudworthy Bridge | Caudworthy Water | 16 km | 5 Mar 2024 · 2.6 years ago | Oxygen 96.6%Temp 7.3 °CpH 7.07Ammonia 0.045 mg/l |
| Caudworthy Water at Billacott | Caudworthy Water | 13 km | 5 Mar 2024 · 2.6 years ago | Oxygen 95.1%Temp 7.2 °CpH 6.96Ammonia 0.042 mg/l |
| River Ottery at Higher Penrose | River Ottery | 12 km | Last sampled 21 Sep 2015, before the imported period | |
| Bodgate Stream at Payntersmoor Plantations | unnamed stream | 12 km | 18 Dec 2025 · 10 months ago | Oxygen 94.9%Temp 9.9 °CpH 7.01Ammonia 0.0027 mg/l Nov 2025 |
| Caudworthy Water upstream of River Ottery | Caudworthy Water | 9.9 km | 14 Sep 2026 · 24 days ago | Oxygen 77.7%Temp 16.5 °CpH 7.4Ammonia 0.043 mg/l |
| Bolesbridge Water upstream of Otter Sanctuary | Bolesbridge Water | 8.1 km | 1 May 2026 · 5 months ago | Oxygen 94.7%Temp 14.1 °CpH 7.52Ammonia below 0.03 mg/l |
| Tamar Ottery Sanctuary Island Pond O/F | Bolesbridge Water | 8.0 km | Last sampled 8 Dec 2016, before the imported period | |
| Tamar Otter Sanctuary Marsh Pond Overflow | Bolesbridge Water | 7.9 km | Last sampled 8 Dec 2016, before the imported period | |
| Bolesbridge Water 200 m downstream of Navarino Bridge | Bolesbridge Water | 7.8 km | Last sampled 31 May 2019, before the imported period | |
| River Ottery at Hellescott Bridge | River Ottery | 7.0 km | 5 Mar 2024 · 2.6 years ago | Oxygen 95.1%Temp 7.2 °CpH 7.15Ammonia 0.097 mg/l |
| River Ottery at Yeolmbridge | River Ottery | 2.5 km | Last sampled 18 Mar 2019, before the imported period |
| Sampling point | Watercourse (map) | Below the gauge | Last sample | Latest results (river water) |
|---|---|---|---|---|
| River Ottery at Ham Mill Bridge | River Ottery | 1.0 km | Last sampled 4 Jul 2019, 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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