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Live levels from 1 monitoring station across Wiltshire, updated every 15 minutes.
| Station | Level now | Status |
|---|---|---|
| Trowbridge | 0.19 mASD 42m 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 Biss 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 Biss above Trowbridge on the river map. Streams without a gauge are not counted here.
Below Trowbridge, its water next reaches Bradford on Avon, a gauge on River Avon, 8.3 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 Trowbridge, the Biss’s lowest gauge on the river map: on the Biss itself, on its gauged tributaries, and on smaller streams that join above there.
Official figures for 2025, for the overflows traced upstream of Trowbridge: 2 spills over 3.1 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 Biss includes the smaller streams that join it there.
Within 3 km of one of the Biss’s gauges in a straight line, but the river map cannot say whether their water reaches it.
6 other overflows within 3 km of these gauges are placed below the Biss’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.
14 sampling points on the River Biss and the streams that join it above Trowbridge, and below it. 3 have a sample from the last 12 months; 4 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) |
|---|---|---|---|---|
| Clivey WC downstream of Frome Market | unnamed stream | 12 km | Last sampled 24 Jun 2003, before the imported period | |
| Biss at Westbury Leigh | Biss Brook | 10.0 km | 5 May 2026 · 5 months ago | Oxygen 98%Temp 11.9 °CpH 8.17Ammonia below 0.03 mg/l |
| Heywood House | unnamed stream | 7.6 km | 5 May 2026 · 5 months ago | Oxygen 88.7%Temp 13.4 °CpH 8.09Ammonia 0.052 mg/l |
| Bitham Brook upstream of Westbury sewage treatment works | Bitham Brook | 7.3 km | Last sampled 9 Jun 2004, before the imported period | |
| Bitham Brook Blenches Farm | Bitham Brook | 7.3 km | 1 Dec 2023 · 2.9 years ago | Oxygen 93%Temp 8.2 °CpH 8.18Ammonia below 0.03 mg/l |
| Bitham Brook downstream of Westbury sewage treatment works | Bitham Brook | 7.3 km | Last sampled 9 Jun 2004, before the imported period | |
| Biss Brook House | Biss Brook | 7.0 km | Last sampled 20 Feb 2017, before the imported period | |
| Bitham Brook at Norleaze | Bitham Brook | 6.0 km | Last sampled 7 Mar 2023, before the imported period | |
| Bitham Brook Horse Bridge | Bitham Brook | 5.4 km | Last sampled 1 Sep 2004, before the imported period | |
| Biss Yarnbrook | River Biss | 4.1 km | Last sampled 11 Dec 2013, before the imported period | |
| Paxcroft Brook at Leap Gate | Paxcroft Brook | 1.9 km | Last sampled 29 Mar 2019, before the imported period |
| Sampling point | Watercourse (map) | Below the gauge | Last sample | Latest results (river water) |
|---|---|---|---|---|
| Biss at Trowbridge Ultrasonic | River Biss | 0.5 km | 21 May 2026 · 5 months ago | Oxygen 89.5%Temp 14 °CpH 8.12Ammonia 0.041 mg/l |
| Biss upstream of S/W | River Biss | 1.8 km | Last sampled 24 Jun 2004, before the imported period | |
| River Biss at K&A Canal Aqueduct | River Biss | 3.2 km | Last sampled 5 Oct 2022, 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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