FloodRadar
Log inCreate free account

Explore FloodRadar

Explore the map
Weather
Why ?
Home › Rivers › River Red

River Red water levels

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

2stations
0above typical high
2catchments
⚠️ Several distinct UK rivers share the name “River Red” — sections below are grouped by catchment.

Gauges

River Red — Colne (Upper)

1 station in this catchment

StationTownLevel nowStatusTrend
Redbournstructureplace estimatedRedbourn-0.28 mASD 25m agoLow—

River Red — West Cornwall

1 station in this catchment

StationTownLevel nowStatusTrend
Gwithianplace estimatedGwithian0.58 m 40m agoLow—

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 Red 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 Red above Gwithian on the river map. Streams without a gauge are not counted here.

Where the Red goes

No gauge below Gwithian 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.

Streams without a gauge

Named streams on the river map that flow into the Red 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 Gwithian, the Red’s lowest gauge on the river map: on the Red 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 Gwithian: 106 spills over 528 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 Red includes the smaller streams that join it there.

Above Gwithian, the Red’s highest gauge3 overflows
  • #n/A Not discharging
    South West Water · into Red River · 9.2 km by river above Gwithian · 2025: 2 spills, 0.2 h
  • Mill Road Pscso/EO Not discharging
    South West Water · into Red River (S) · 6.5 km by river above Gwithian · 2025: 62 spills, 284 h
  • Reskadinnick Pumping Station Not discharging bathing water
    South West Water · into Red River (S) · 5.5 km by river above Gwithian · 2025: 42 spills, 244 h

Near these gauges, connection not known

Within 3 km of one of the Red’s gauges in a straight line, but the river map cannot say whether their water reaches it.

  • Hayle Sewage Treatment Works Not discharging bathing water
    South West Water · into Atlantic (C) · 2.7 km from Gwithian in a straight line · discharges to the sea, an estuary or tidal water · 2025: 49 spills, 475 h

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.

18 sampling points on the River Red and the streams that join it above Gwithian. 8 have a sample from the last 12 months; 14 have any sample banked. Listed from the source down, grouped by the next gauge each one's water reaches.

Above Gwithian River Red 18 points, 14 with samples
Sampling pointWatercourse (map)Above the gaugeLast sampleLatest results (river water)
Praze River at Prazeunnamed stream11 km29 Sep 2026 · 9 days agoOxygen 94.2%Temp 16.4 °CpH 7.4Ammonia below 0.03 mg/l
Red River above Brea Tin WorksRed River11 km20 Aug 2026 · 49 days agoOxygen 89.6%Temp 15.9 °CpH 6.73Conductivity 163 µS/cm
Red River downstream of Treskillard Stream confluenceRed River10 km8 Sep 2026 · 30 days agoOxygen 95.4%Temp 15.3 °CpH 6.85Ammonia below 0.03 mg/l Mar 2024
Red River upstream of South Crofty Plant/MillRed River8.9 km8 Sep 2026 · 30 days agoOxygen 100%Temp 15.5 °CpH 7.61Ammonia below 0.03 mg/l Mar 2024
Red River downstream of South Crofty PLANT/ MillRed River8.9 kmLast sampled 6 Dec 2006, before the imported period
Roseworthy Stream upstream of Trevoole Streamunnamed stream8.7 kmLast sampled 29 Jan 2015, before the imported period
Roseworthy Stream at Botetoe Bridgeunnamed stream8.5 km21 Mar 2024 · 2.5 years agopH 6.87
Reen Stream upstream of Roseworthyunnamed stream7.7 kmLast sampled 29 Jan 2015, before the imported period
Tehidy Stream at Old Merroseunnamed stream7.5 km21 Mar 2024 · 2.5 years agopH 7.1
Red River at Roscroggan BridgeRed River7.2 km8 Sep 2026 · 30 days agoOxygen 100%Temp 15.5 °CpH 7.72Ammonia below 0.03 mg/l Mar 2024
Red River at Rosewarne FarmRed River6.4 km8 Sep 2026 · 30 days agoOxygen 99.4%Temp 16.6 °CpH 7.43Ammonia below 0.03 mg/l Mar 2024
Reskadinnick tributary of Red Riverunnamed stream6.0 km21 Mar 2024 · 2.5 years agopH 7.7
Tehidy Stream at Coombeunnamed stream5.1 km21 Mar 2024 · 2.5 years agopH 7.7
Red River at Kieve BridgeRed River5.0 km8 Sep 2026 · 30 days agoOxygen 99.4%Temp 16.8 °CpH 7.52Ammonia below 0.03 mg/l Mar 2024
Red River at Menadarva BridgeRed River3.2 kmLast sampled 2 Jan 2003, before the imported period
Gwithian Stream at Green Laneunnamed stream1.0 km21 Mar 2024 · 2.5 years agopH 8.06
Tributary of Red River at GwithianRed River0.3 km21 Mar 2024 · 2.5 years agopH 7.6
Red River at Gwithian TowansRed River0.3 km8 Sep 2026 · 30 days agoOxygen 89.6%Oxygen 8.77 mg/l Jul 2026Temp 15.9 °CpH 7.54

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 → Cornwall rivers → Hertfordshire rivers → All UK rivers