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Live levels from 6 monitoring stations across Cornwall, Devon, updated every 15 minutes.
| Station | Level now | Status | ||
|---|---|---|---|---|
| Tamarstone Bridge | 0.16 m 27m ago | Normal | ||
| 4.8 km by river | ||||
| Bridge Rule | 0.30 m 27m ago | Normal | ||
| 6.3 km by river | ||||
| Crowford Bridge | 0.12 m 27m ago | Normal | ||
| 21.8 km by river | ||||
| Polson Bridge | 0.24 m 27m ago | Normal | ||
| 7.0 km by river | ||||
| Greystone Bridge | 0.15 m 27m ago | Normal | ||
| 19.1 km by river | ||||
| Gunnislake | 0.32 mASD 27m 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 Tamar 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 Tamar between Crowford Bridge and Polson Bridge, no more than 3.0 km by river above Polson Bridge.
| Truscott | 0.41 m 27m ago | Low |
| 4.0 km by river | ||
| Launceston | 0.11 m 27m ago | Low |
Its water passes Polson Bridge and every gauge below it on the Tamar. It does not pass Crowford Bridge or the gauges above it.
Joins the Tamar between Crowford Bridge and Polson Bridge, no more than 3.8 km by river above Polson Bridge.
| Trengune | 0.17 mASD 27m ago | Normal |
| 5.3 km by river | ||
| Canworthy Water Bridge | 0.16 m 27m ago | Normal |
| 17.4 km by river | ||
| Werrington | 0.10 m 27m ago | Low |
Its water passes Polson Bridge and every gauge below it on the Tamar. It does not pass Crowford Bridge or the gauges above it.
Joins the Tamar between Polson Bridge and Greystone Bridge, no more than 5.8 km by river above Greystone Bridge.
| Lifton Park | 0.48 mASD 27m ago | Normal |
Its water passes Greystone Bridge and every gauge below it on the Tamar. It does not pass Polson Bridge or the gauges above it.
Joins the Tamar between Greystone Bridge and Gunnislake, no more than 16.8 km by river above Gunnislake.
| Bealsmill | 0.35 m 27m ago | Normal |
Its water passes Gunnislake and every gauge below it on the Tamar. It does not pass Greystone Bridge or the gauges above it.
Below Gunnislake, its water next reaches Plymouth, 32.0 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.
38 storm overflows are traced upstream of Gunnislake, the Tamar’s lowest gauge on the river map: on the Tamar itself, on its gauged tributaries, and on smaller streams that join above there.
Official figures for 2025, for the overflows traced upstream of Gunnislake: 2,286 spills over 27,022 hours in total, across the 35 that have a figure. 2 had no usable monitor data that year; 1 has 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 Tamar 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 6 more: show all 9 overflows on this stretch → All above Polson Bridge, nearest first →
and 3 more: show all 6 overflows on the Lyd and the streams that join it → All above Lifton Park, nearest first →
and 8 more: show all 11 overflows on this stretch → All above Gunnislake, nearest first →
Within 3 km of one of the Tamar’s gauges in a straight line, but the river map cannot say whether their water reaches it.
3 more near these gauges whose connection is not known.
3 other overflows within 3 km of these gauges are placed below the Tamar’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.
147 sampling points on the River Tamar and the streams that join it above Gunnislake, and below it. 54 have a sample from the last 12 months; 82 have any sample banked.
Sampled most recently, anywhere on the Tamar and its streams:
| Where, from the source down | Sampling points | Newest sample |
|---|---|---|
| Above Tamarstone Bridge | 9 points2 sampled | 28 Sep 2026 |
| Above Tamarstone Bridge | 10 points2 sampled | 28 Sep 2026 |
| Above Bridge Rule | 5 points3 sampled | 29 Sep 2026 |
| Above Crowford Bridge | 1 point | 15 Sep 2026 |
| River Ottery and its streamsjoins the Tamar above Polson Bridge | 16 points8 sampled | 14 Sep 2026 |
| River Kensey and its streamsjoins the Tamar above Polson Bridge | 4 points1 sampled | 13 Aug 2026 |
| River Lyd and its streamsjoins the Tamar above Greystone Bridge | 28 points16 sampled | 23 Sep 2026 |
| Above Polson Bridge | 41 points28 sampled | 28 Sep 2026 |
| Above Greystone Bridge | 2 points1 sampled | 5 May 2026 |
| Above BealsmillRiver Inny · joins the Tamar above Gunnislake | 19 points10 sampled | 15 Sep 2026 |
| Above Gunnislake | 10 points8 sampled | 7 Sep 2026 |
| Below the lowest gauge | 2 points | 13 Aug 2026 |
England's samples only. Each count opens the list of those points, nearest first, with the date of each one’s latest sample (the gauge’s “Upstream of here” list).
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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