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Live levels from 4 monitoring stations across Lancashire, updated every 15 minutes.
| Station | Level now | Status | ||
|---|---|---|---|---|
| Pincock Brow | 0.07 m 1h ago | Low | ||
| 4.2 km by river | ||||
| Croston Dam | 0.51 m 1h ago | Normal | ||
| 3.0 km by river | ||||
| Croston | 0.28 m 1h ago | Normal | ||
| 1.6 km by river | ||||
| Castle Bridge Crostontidal | 0.56 m 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 Yarrow 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 Yarrow above Pincock Brow, its highest gauge, no more than 12.6 km by river above Pincock Brow.
| Chorley Haworth Road | 0.18 m 1h ago | Normal |
Its water passes every gauge on the Yarrow, from Pincock Brow down.
Joins the Yarrow between Croston Dam and Croston, no more than 4.5 km by river above Croston.
| Eccleston Heskin Bridge | 0.56 m 3h ago | Normal |
Its water passes Croston and every gauge below it on the Yarrow. It does not pass Croston Dam or the gauges above it.
No gauge below Castle Bridge Croston is known on the river map.
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.
26 storm overflows are traced upstream of Castle Bridge Croston, the Yarrow’s lowest gauge on the river map: on the Yarrow itself, on its gauged tributaries, and on smaller streams that join above there.
Official figures for 2025, for the overflows traced upstream of Castle Bridge Croston: 764 spills over 4,432 hours in total, across all 26.
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 Yarrow includes the smaller streams that join it there.
Within 3 km of one of the Yarrow’s gauges in a straight line, but the river map cannot say whether their water reaches it.
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: © United Utilities 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 River Yarrow and the streams that join it above Castle Bridge Croston. 2 have a sample from the last 12 months; 3 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) |
|---|---|---|---|---|
| Black Brook upstream of T Witter | Black Brook | 1.6 km | Last sampled 16 Mar 2018, before the imported period |
| Sampling point | Watercourse (map) | Above the gauge | Last sample | Latest results (river water) |
|---|---|---|---|---|
| River Yarrow downstream of Rivington Reservoir | River Yarrow | 16 km | Last sampled 1 Sep 2015, before the imported period | |
| River Yarrow at Flag Lane | River Yarrow | 13 km | Last sampled 2 Dec 2022, before the imported period | |
| River Yarrow above confluence with Black Brook | River Yarrow | 11 km | Last sampled 4 Apr 2017, before the imported period | |
| Black Brook above confluence with Yarrow | Black Brook | 11 km | Last sampled 8 Dec 2006, before the imported period | |
| Eller Brook (Yarrow) at A5106 | Eller Brook | 8.7 km | Last sampled 8 Dec 2006, before the imported period | |
| River Yarrow at Birkacre | River Yarrow | 5.7 km | 12 May 2026 · 5 months ago | Oxygen 98.4%Temp 9.4 °CpH 8.1Ammonia below 0.03 mg/l |
| Clancutt Brook at B5251 | Clancutt Brook | 5.5 km | Last sampled 20 Jun 2007, before the imported period | |
| River Chor at A581 Road Bridge | River Chor | 3.9 km | Last sampled 8 Dec 2006, before the imported period | |
| River Chor above the confluence with Yarrow | River Chor | 3.0 km | Last sampled 3 May 2019, before the imported period | |
| River Chor downstream of No. 2 Lodge | River Chor | 2.7 km | Last sampled 5 May 2000, before the imported period | |
| River Yarrow Up Stream of Chorley Etw | River Yarrow | 1.7 km | Last sampled 11 Sep 2014, before the imported period | |
| River Yarrow at A49 Bridge Pincock | River Yarrow | 0.1 km | 15 Mar 2024 · 2.6 years ago | Oxygen 100.5%Temp 10.3 °CpH 7.84Ammonia 0.21 mg/l |
| Sampling point | Watercourse (map) | Above the gauge | Last sample | Latest results (river water) |
|---|---|---|---|---|
| Culbeck Brook at A581 | Culbeck Brook | 1.5 km | Last sampled 3 Apr 2017, before the imported period |
| Sampling point | Watercourse (map) | Above the gauge | Last sample | Latest results (river water) |
|---|---|---|---|---|
| Syd Brook above the confluence with River Yarrow | Syd Brook | 0.6 km | 12 May 2026 · 5 months ago | Oxygen 104.6%Temp 9.5 °CpH 8.35Ammonia below 0.03 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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