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Home › Rivers › River Coly

River Coly water levels

Live levels from 2 monitoring stations across Devon, updated every 15 minutes.

2stations
0above typical high

Gauges

Monitoring stations, source to mouth

StationTownLevel nowStatusTrend
BonehayneColyton0.15 m 28m agoLow—
3.7 km by river
Colyton Station Road—0.55 mASD 28m agoNormal—

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.

Gauged tributaries

Streams and rivers with a gauge whose water joins the Coly above one of its gauges, from the source down. Named streams without a gauge that have a page here are listed at the end.

1 gauged tributary, 1 gauge

Where the Coly goes

Below Colyton Station Road, its water next reaches Seaton, a gauge on River Axe, 5.3 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.

Streams without a gauge

Named streams on the river map that flow into the Coly and have no gauge of their own. Each has a page with what is known about it: the next gauge downstream, and any storm overflows or water-sampling points placed on it.

Storm overflows upstream

3 storm overflows are traced upstream of Colyton Station Road, the Coly’s lowest gauge on the river map: on the Coly itself, on its gauged tributaries, and on smaller streams that join above there.

  • 0 report discharging now
  • 3 not discharging
  • 0 offline or silent: 0 monitor offline, 0 status unknown, 0 no live feed

Official figures for 2025, for the overflows traced upstream of Colyton Station Road: 118 spills over 1,550 hours in total, across all 3.

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 Coly includes the smaller streams that join it there.

Above Bonehayne, the Coly’s highest gauge1 overflow
Between Bonehayne and Colyton Station Road2 overflows
  • Wilmington STW Not discharging
    South West Water · into (S) Umborne Brook · 8.7 km by river above Colyton Station Road · 2025: 34 spills, 419 h
  • Colyton Chantry CSO Not discharging
    South West Water · into River Coly · 310 m by river above Colyton Station Road · 2025: 13 spills, 6.1 h

6 other overflows within 3 km of these gauges are placed below the Coly’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: © South West 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.

Water samples

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.

12 sampling points on the River Coly and the streams that join it above Colyton Station Road, and below it. 5 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.

Above Bonehayne River Coly 5 points, 3 with samples
Sampling pointWatercourse (map)Above the gaugeLast sampleLatest results (river water)
Offwell Brook upstream confluenceOffwell Brook5.9 km5 Dec 2025 · 10 months agoOxygen 94.3%Temp 7.2 °CpH 7.05Ammonia 0.0052 mg/l
Offwell Brook at West ColwellOffwell Brook5.6 kmLast sampled 2 Feb 2017, before the imported period
River Coly at WoodbridgeRiver Coly3.6 km14 Sep 2026 · 24 days agoOxygen 88%Temp 17.4 °CpH 7.69Ammonia below 0.03 mg/l
Offwell Brook at Roadpitt FarmOffwell Brook0.7 km8 Sep 2026 · 30 days agoOxygen 95.4%Temp 14.5 °CpH 7.67Ammonia below 0.03 mg/l
River Coly at Brinkley BridgeRiver Coly0.6 kmLast sampled 2 Mar 2023, before the imported period
Above Colyton Station Road River Coly 6 points, 2 with samples
Sampling pointWatercourse (map)Above the gaugeLast sampleLatest results (river water)
Umborne Brook downstream of Wilmington F FarmUmborne Brook9.1 kmLast sampled 12 May 2011, before the imported period
Umborne Brook upstream of Wilmington sewage treatment worksUmborne Brook8.5 kmLast sampled 5 Mar 2002, before the imported period
Umborne Brook downstream of Wilmington sewage treatment worksUmborne Brook8.4 kmLast sampled 5 Mar 2002, before the imported period
Umborne Brook at Triffords FarmUmborne Brook7.5 kmLast sampled 20 Nov 2006, before the imported period
Nannies Water at Road Bridgeunnamed stream2.5 km15 Mar 2024 · 2.6 years agoOxygen 99%Temp 9.9 °CpH 7.7Ammonia 0.11 mg/l
River Coly at Heathayne FarmRiver Coly1.5 km23 Sep 2026 · 15 days agoE. coli 1400 per 100 ml
Below Colyton Station Road 1 point
Sampling pointWatercourse (map)Below the gaugeLast sampleLatest results (river water)
River Coly at ColyfordRiver Coly1.9 km23 Sep 2026 · 15 days agoOxygen 99.1% Sep 2026Temp 16 °C Sep 2026pH 8.22 Sep 2026Ammonia below 0.03 mg/l Sep 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.

Wave tracker for this river → Devon rivers → All UK rivers