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Live levels from 2 monitoring stations across Wiltshire, updated every 15 minutes.
| Station | Level now | Status | ||
|---|---|---|---|---|
| Calne | 0.14 mASD 28m ago | Normal | ||
| 6.9 km by river | ||||
| Stanley | 0.40 mASD 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 Marden 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 Marden above Stanley on the river map. Streams without a gauge are not counted here.
Below Stanley, its water next reaches Bradford on Avon, a gauge on River Avon, 35.0 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.
10 storm overflows are traced upstream of Stanley, the Marden’s lowest gauge on the river map: on the Marden itself, on its gauged tributaries, and on smaller streams that join above there.
Official figures for 2025, for the overflows traced upstream of Stanley: 125 spills over 530 hours in total, across all 10.
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 Marden includes the smaller streams that join it there.
Within 3 km of one of the Marden’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 Marden’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.
17 sampling points on the River Marden and the streams that join it above Stanley. 4 have a sample from the last 12 months; 6 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 Marden Calstone Wellington | River Marden | 4.8 km | Last sampled 11 Dec 2006, before the imported period | |
| Marden Sprays Farm | River Marden | 4.3 km | 8 Sep 2026 · 30 days ago | Oxygen 95.7%Temp 12 °CpH 7.96Ammonia below 0.03 mg/l |
| Rivers Brook Cherhill | River's Brook | 4.2 km | 18 May 2026 · 5 months ago | Oxygen 100.7%Temp 10.8 °CpH 8.14Ammonia below 0.03 mg/l |
| Abberd Brook at Freeth Farm | Abberd Brook | 3.0 km | Last sampled 25 Jun 2004, before the imported period | |
| Marden Quemerford | River Marden | 1.9 km | Last sampled 23 Mar 2017, before the imported period | |
| Abberd Brook upstream of Bradley | Abberd Brook | 1.6 km | Last sampled 24 Jul 2003, before the imported period | |
| Rivers Brook Wessington | River's Brook | 1.6 km | 8 Jul 2026 · 3 months ago | pH 8.06 |
| Abberd Brook at Brook Way | Abberd Brook | 0.7 km | 19 Dec 2024 · 22 months ago | Oxygen 96.5%Temp 8 °CpH 8.1Ammonia 0.043 mg/l |
| Abberd Brook Doctors Pond | Abberd Brook | 0.3 km | Last sampled 10 Apr 2017, before the imported period | |
| Abberd Brook | Abberd Brook | 0.1 km | Last sampled 19 May 2017, before the imported period |
| Sampling point | Watercourse (map) | Above the gauge | Last sample | Latest results (river water) |
|---|---|---|---|---|
| Tributary of Cowage Brook above RAF Lyneham sewage treatment works | Cowage Brook | 13 km | Last sampled 28 Jul 2023, before the imported period | |
| Littlecott Stream Beaconhill | Cowage Brook | 11 km | Last sampled 9 Mar 2023, before the imported period | |
| Willow Brook Broads Green | unnamed stream | 8.4 km | Last sampled 23 Mar 2017, before the imported period | |
| Cowage Brook Low Bridge | Cowage Brook | 6.0 km | Last sampled 6 Mar 2023, before the imported period | |
| Marden Conigre | River Marden | 3.9 km | Last sampled 9 Feb 2022, before the imported period | |
| Cowage Brook at Swerves Farm, Ratford | Cowage Brook | 3.5 km | 8 Dec 2025 · 10 months ago | Oxygen 93.1%Temp 9.8 °CpH 7.94Ammonia below 0.03 mg/l |
| Marden Stanley M | River Marden | 0.2 km | 5 Mar 2024 · 2.6 years ago | Oxygen 100.1%Temp 7.9 °CpH 8.29Ammonia 0.096 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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