FloodRadar
Log inCreate free account
Live levels from 2 monitoring stations across Somerset, updated every 15 minutes.
| Station | Level now | Status | ||
|---|---|---|---|---|
| Stoke Bottom Farm | 0.00 mASD 42m ago | Low | ||
| 12.7 km by river | ||||
| Vallis | 0.08 m 27m 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 Mells River 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.
Joins the Mells River between Stoke Bottom Farm and Vallis, no more than 6.4 km by river above Vallis.
| Holwell | 0.68 mASD 27m ago | Normal |
Its water passes Vallis and every gauge below it on the Mells River. It does not pass Stoke Bottom Farm or the gauges above it.
Below Vallis, its water next reaches Tellisford, a gauge on Somerset Frome, 12.6 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.
7 storm overflows are traced upstream of Vallis, the Mells River’s lowest gauge on the river map: on the Mells River itself, on its gauged tributaries, and on smaller streams that join above there.
Official figures for 2025, for the overflows traced upstream of Vallis: 124 spills over 1,613 hours in total, across the 6 that have a figure. 1 had no usable monitor data that year.
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 Mells River includes the smaller streams that join it there.
Within 3 km of one of the Mells River’s gauges in a straight line, but the river map cannot say whether their water reaches it.
10 other overflows within 3 km of these gauges are placed below the Mells River’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.
15 sampling points on the Mells River and the streams that join it above Vallis, and below it. 2 have a sample from the last 12 months; 2 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) |
|---|---|---|---|---|
| Mells River at Blacker's Wood | unnamed stream | 3.9 km | 30 Sep 2026 · 8 days ago | Oxygen 96.5% Aug 2026Temp 12.2 °C Aug 2026pH 8.44 Aug 2026Ammonia 0.006 mg/l Aug 2026 |
| Mells Stoke Bottom | Mells Stream | 0.4 km | Last sampled 17 Feb 2017, before the imported period |
| Sampling point | Watercourse (map) | Above the gauge | Last sample | Latest results (river water) |
|---|---|---|---|---|
| Nunney Brook Meadhouse | Nunney Brook | 4.7 km | Last sampled 22 May 2003, before the imported period | |
| Nunney Brook Cloford | Nunney Brook | 2.0 km | Last sampled 22 May 2003, before the imported period | |
| Nunney Brook at Cloford Manor | Nunney Brook | 1.2 km | Last sampled 11 Mar 2020, before the imported period | |
| Nunney Brook upstream of Ecc Holwell | Nunney Brook | 0.1 km | Last sampled 28 Apr 2017, before the imported period |
| Sampling point | Watercourse (map) | Above the gauge | Last sample | Latest results (river water) |
|---|---|---|---|---|
| Whatley Brook downstream of Tunnel | unnamed stream | 9.0 km | Last sampled 11 Feb 2015, before the imported period | |
| Mells Vobster | Mells Stream | 6.5 km | Last sampled 15 Feb 2017, before the imported period | |
| Nunney Brook Nunney | Nunney Brook | 5.3 km | 5 May 2026 · 5 months ago | Oxygen 108.7%Temp 13.4 °CpH 8.45Ammonia below 0.03 mg/l |
| Whatley Brook Railford Bridge | Fordbury Water | 4.7 km | Last sampled 11 Mar 2020, before the imported period | |
| Nunney Brook upstream of Footbridge, Donkey Lane | Nunney Brook | 4.6 km | Last sampled 7 Dec 2022, before the imported period | |
| Mells Great Elm | Mells Stream | 1.8 km | Last sampled 14 Jul 2004, before the imported period | |
| Nunney Brook Egford | Egford Brook | 0.9 km | Last sampled 19 Mar 2020, before the imported period | |
| Mells Hapsford Flume | Mells River | 0.2 km | Last sampled 17 Mar 2017, before the imported period |
| Sampling point | Watercourse (map) | Below the gauge | Last sample | Latest results (river water) |
|---|---|---|---|---|
| River Mells M | Mells River | 2.5 km | Last sampled 11 Jun 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.
FloodRadar helper · beta