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Live levels from 3 monitoring stations across Somerset, updated every 15 minutes.
| Station | Level now | Status | ||
|---|---|---|---|---|
| Donyatt | 0.23 mASD 1h ago | Normal | ||
| 8.1 km by river | ||||
| Ashford Mill | 0.10 mASD 1h ago | Normal | ||
| 11.3 km by river | ||||
| Midelney | 1.41 mASD 1h 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 Isle 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 Isle above Midelney on the river map. Streams without a gauge are not counted here.
Below Midelney, its water next reaches Westover Pumping Station, a gauge on River Parrett, 4.5 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.
13 storm overflows are traced upstream of Midelney, the Isle’s lowest gauge on the river map: on the Isle itself, on its gauged tributaries, and on smaller streams that join above there.
Official figures for 2025, for the overflows traced upstream of Midelney: 453 spills over 4,689 hours in total, across all 13.
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 Isle includes the smaller streams that join it there.
Within 3 km of one of the Isle’s gauges in a straight line, but the river map cannot say whether their water reaches it.
1 other overflow within 3 km of these gauges is placed below the Isle’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: © Wessex 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.
20 sampling points on the River Isle and the streams that join it above Midelney. 13 have a sample from the last 12 months; 13 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) |
|---|---|---|---|---|
| Upstream of Combe St Nicholas sewage treatment works | River Isle | 6.2 km | 28 Sep 2026 · 10 days ago | Oxygen 92.9%Temp 11.6 °CpH 8.18Ammonia below 0.03 mg/l |
| River Isle at Hornsbury Mill | River Isle | 4.4 km | No sample published 1 Oct 2023 – 7 Oct 2026 | |
| River Isle upstream of Chard sewage treatment works | River Isle | 3.4 km | 11 Aug 2026 · 58 days ago | Oxygen 81.2%Temp 20.6 °CpH 7.79Ammonia 0.045 mg/l |
| River Isle Bere Mills Farm | River Isle | 2.2 km | 11 Sep 2026 · 27 days ago | Oxygen 94.8%Temp 14.3 °CpH 8.25Ammonia below 0.03 mg/l |
| Dowlish Brook Dunpole Farm | Dowlish Brook | 1.4 km | 11 Sep 2026 · 27 days ago | Oxygen 82.6%Temp 14.5 °CpH 8.08Ammonia 0.045 mg/l |
| River Isle Watery Lane 1 | River Isle | 1.3 km | No sample published 1 Oct 2023 – 7 Oct 2026 |
| Sampling point | Watercourse (map) | Above the gauge | Last sample | Latest results (river water) |
|---|---|---|---|---|
| River Isle Hort Bridge | River Isle | 6.5 km | 18 Sep 2026 · 20 days ago | Oxygen 98.5%Temp 14.7 °CpH 8.09Ammonia below 0.03 mg/l |
| River Ding near Yetfd Dy H | River Ding | 6.0 km | 13 May 2026 · 5 months ago | Oxygen 100.1%Temp 11.3 °CpH 8.16Ammonia below 0.03 mg/l |
| River Isle Cocks Bridge A3168 | River Isle | 3.6 km | 16 Sep 2026 · 22 days ago | Oxygen 87.9%Temp 15.5 °CpH 8.18Ammonia below 0.03 mg/l |
| River Isle Ilford Brdges | River Isle | 2.1 km | 11 Sep 2026 · 27 days ago | Oxygen 94.8%Temp 15.7 °CpH 8.04Ammonia below 0.03 mg/l |
| Sampling point | Watercourse (map) | Above the gauge | Last sample | Latest results (river water) |
|---|---|---|---|---|
| At Whitty | unnamed stream | 20 km | 15 Dec 2025 · 10 months ago | Oxygen 99.3%Temp 10.1 °CpH 8.25Ammonia below 0.03 mg/l |
| Fivehead River at Hatch Green | unnamed stream | 16 km | 18 Sep 2026 · 20 days ago | Oxygen 72.3%Temp 14.8 °CpH 7.64Ammonia below 0.03 mg/l |
| Fivehead River at Elm Bridge | unnamed stream | 14 km | No sample published 1 Oct 2023 – 7 Oct 2026 | |
| Fivehead tributary at Keysey Farm | Venner's Water | 13 km | No sample published 1 Oct 2023 – 7 Oct 2026 | |
| River Isle Bradon Bridge | River Isle | 10 km | 11 Sep 2026 · 27 days ago | Oxygen 82.6%Temp 15.8 °CpH 7.82Ammonia below 0.03 mg/l |
| River Isle at Southey Farm | River Isle | 9.1 km | 5 Aug 2026 · 2 months ago | Oxygen 73.2%Temp 19.1 °CpH 7.86Ammonia below 0.03 mg/l Jul 2026 |
| Fivehead River Fivehd Road | Fivehead River | 7.7 km | No sample published 1 Oct 2023 – 7 Oct 2026 | |
| River Isle Hambridge | River Isle | 2.7 km | No sample published 1 Oct 2023 – 7 Oct 2026 | |
| River Isle Midelney | River Isle | 1.1 km | 11 Sep 2026 · 27 days ago | Oxygen 50.4%Temp 16.3 °CpH 7.47Ammonia below 0.03 mg/l |
| River Isle Midelney P.S. | River Isle | 0.1 km | No sample published 1 Oct 2023 – 7 Oct 2026 |
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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