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Home › Rivers › River Ray

River Ray water levels

Live levels from 6 monitoring stations across Buckinghamshire, Oxfordshire, Swindon, Wiltshire, updated every 15 minutes.

6stations
0above typical high
2catchments
⚠️ Several distinct UK rivers share the name “River Ray” — sections below are grouped by catchment.

Gauges

River Ray — Cherwell Thame and Wye

3 stations in this catchment

StationTownLevel nowStatusTrend
Grendon UnderwoodstructureGrendon Underwood0.04 mASD 24m agoNormal—
11.1 km by river
Lower ArncottLower Arncott0.47 mASD 24m agoNormal—
11.8 km by river
Islipislip6.76 mASD 24m agoNormal—

River Ray — Vale of White Horse

3 stations in this catchment

StationTownLevel nowStatusTrend
Rushey PlattSwindon0.72 mASD 24m agoLow—
2.5 km by river
RodbourneHaydon Wick0.16 mASD 24m agoNormal—
10.8 km by river
Water EatonCricklade1.43 mASD 24m 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 Ray above one of its gauges, from the source down. Named streams without a gauge that have a page here are listed at the end.

River Ray — Cherwell Thame and Wye

2 gauged tributaries, 2 gauges

Langford Brook

Joins the Ray between Lower Arncott and Islip, no more than 14.7 km by river above Islip.

Langford Village0.28 mASD 24m agoNormal

Its water passes Islip and every gauge below it on the Ray. It does not pass Lower Arncott or the gauges above it.

Wendlebury Brook

Joins the Ray between Lower Arncott and Islip, no more than 10.7 km by river above Islip.

Wendlebury1.02 mASD 24m agoNormal

Its water passes Islip and every gauge below it on the Ray. It does not pass Lower Arncott or the gauges above it.

Where the Ray goes

Below Islip, its water next reaches Kings Mill, a gauge on River Cherwell, 10.1 km by river downstream.

River Ray — Vale of White Horse

No gauged tributary joins the Ray above Water Eaton on the river map. Streams without a gauge are not counted here.

Where the Ray goes

Below Water Eaton, its water next reaches Hannington Bridge, a gauge on River Thames, 9.0 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.

River Ray — Cherwell Thame and Wye

Streams without a gauge

Named streams on the river map that flow into the Ray 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.

River Ray — Vale of White Horse

Streams without a gauge

Storm overflows upstream

River Ray — Cherwell Thame and Wye

8 storm overflows are traced upstream of Islip, the Ray’s lowest gauge on the river map: on the Ray itself, on its gauged tributaries, and on smaller streams that join above there.

  • 0 report discharging now
  • 8 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 Islip: 267 spills over 3,745 hours in total, across all 8.

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 Ray includes the smaller streams that join it there.

Between Grendon Underwood and Lower Arncott2 overflows
  • Grendon Underwood WwTW Not discharging
    Thames Water · into Oxon Ray · 11.0 km by river above Lower Arncott · 2025: 31 spills, 306 h
  • Ludgershall WwTW Not discharging
    Thames Water · into Ludgershall Brook · 8.5 km by river above Lower Arncott · 2025: 52 spills, 617 h
Between Lower Arncott and Islip6 overflows

River Ray — Vale of White Horse

1 storm overflow is traced upstream of Water Eaton, the Ray’s lowest gauge on the river map: on the Ray itself, on its gauged tributaries, and on smaller streams that join above there.

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

Official figures for 2025, for the overflow traced upstream of Water Eaton: 23 spills over 288 hours.

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 Ray includes the smaller streams that join it there.

Between Rodbourne and Water Eaton1 overflow
  • Swindon WwTW Not discharging
    Thames Water · into River Ray · 10.7 km by river above Water Eaton · 2025: 23 spills, 288 h

Near these gauges, connection not known

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

  • Broome (Attenuation Tank) Not discharging
    Thames Water · into Ray/Ditch · 2.6 km from Rushey Platt in a straight line · no mapped watercourse close enough to be sure · 2025: 16 spills, 141 h

2 other overflows within 3 km of these gauges are placed below the Ray’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: © Thames 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.

River Ray — Cherwell Thame and Wye

16 sampling points on the River Ray and the streams that join it above Islip. 13 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 Grendon Underwood River Ray 1 point
Sampling pointWatercourse (map)Above the gaugeLast sampleLatest results (river water)
Mill HillRiver Ray1.1 km17 Dec 2024 · 22 months agoOxygen 87.6%Temp 7.6 °CpH 7.84Ammonia 0.13 mg/l
Above Langford Village Langford Brook 1 point, 0 with samples
Sampling pointWatercourse (map)Above the gaugeLast sampleLatest results (river water)
Audley Brook at Stratton AudleyAudley Brook4.6 kmLast sampled 15 Feb 2017, before the imported period
Above Lower Arncott River Ray 6 points
Sampling pointWatercourse (map)Above the gaugeLast sampleLatest results (river water)
Ray (Oxon) at gauging station, Grendon UnderwoodRiver Ray11 km3 Mar 2026 · 7 months agoOxygen 82.9%Temp 8.2 °CpH 7.87Ammonia 0.046 mg/l
Launton Brook above Cutters BrookLaunton Brook11 km3 Sep 2026 · 35 days agoOxygen 35.3%Temp 17.9 °CpH 6.08Ammonia 19 mg/l
Gubbinshole Ditch at Gubbin's Hole, Marsh GibbonGubbinshole Ditch10 km4 Aug 2026 · 2 months agoOxygen 76.1% Apr 2026Temp 10.6 °C Apr 2026pH 7.7 Apr 2026Ammonia below 0.03 mg/l Apr 2026
River Ray upstream of Tetchwick Brook tributaryRiver Ray8.0 km4 Sep 2026 · 34 days agoOxygen 74.8%Temp 17.1 °CpH 7.79Ammonia below 0.03 mg/l
Ludgershall Brook at A41, near LudgershallLudgershall Brook6.7 km4 Sep 2026 · 34 days agoOxygen 71.1% Jun 2026Temp 22.6 °C Jun 2026pH 7.84 Jun 2026Ammonia 0.037 mg/l Jun 2026
160 m downstream of A41Ludgershall Brook6.6 km4 Aug 2026 · 2 months agoOxygen 84.1%Temp 18.3 °CpH 7.98Ammonia below 0.03 mg/l
Above Islip River Ray 8 points, 7 with samples
Sampling pointWatercourse (map)Above the gaugeLast sampleLatest results (river water)
Langford Brook at A41, BicesterLangford Brook14 km3 Sep 2026 · 35 days agoOxygen 66.9%Temp 17.8 °CpH 7.62Ammonia below 0.03 mg/l
Ray (Oxon) at Arncott BridgeRiver Ray12 km27 Mar 2026 · 6 months agoOxygen 87.9%Temp 7.4 °CpH 8.33Ammonia 0.042 mg/l
Leys Farm Ditch at A4095 Roadbridge, Middleton Stoneyunnamed stream11 km27 May 2026 · 4 months agoOxygen 107.4% Apr 2026Temp 10.1 °C Apr 2026pH 8.13 Apr 2026Ammonia below 0.03 mg/l Apr 2026
Weston Park FarmOddington Brook6.4 km18 Aug 2026 · 51 days agoOxygen 29.7% Jun 2026Temp 18.7 °C Jun 2026pH 7.58 Jun 2026Ammonia 0.56 mg/l Jun 2026
Ray (Oxon) at Fencott Road BridgeRiver Ray6.1 km4 Aug 2026 · 2 months agoOxygen 55.7%Temp 19.1 °CpH 7.27Ammonia 0.097 mg/l
Gallos Brook downstream of Barndon FarmGallos Brook3.2 kmLast sampled 22 Mar 2022, before the imported period
Downstream of Islip RoadGallos Brook2.0 km2 Dec 2025 · 10 months agoOxygen 71.8%Temp 8.3 °CpH 7.62Ammonia below 0.03 mg/l
Ray (Oxon) at B4027, IslipRiver Ray0.5 km4 Sep 2026 · 34 days agoOxygen 39.5%Temp 17.5 °CpH 7.16Ammonia 0.044 mg/l

River Ray — Vale of White Horse

5 sampling points on the River Ray and the streams that join it above Water Eaton. 3 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.

Above Rodbourne River Ray 1 point
Sampling pointWatercourse (map)Above the gaugeLast sampleLatest results (river water)
Ray at Morris Street, SwindonRiver Ray1.5 km20 Aug 2026 · 49 days agoOxygen 78.7%Temp 16.3 °CpH 8.15Ammonia 0.042 mg/l
Above Water Eaton River Ray 4 points, 2 with samples
Sampling pointWatercourse (map)Above the gaugeLast sampleLatest results (river water)
Lydiard Brook below sewage treatment works, Lydiard MillicentLydiard Brook12 kmLast sampled 22 Mar 2017, before the imported period
Lydiard Brook above Ray (Wilts)Lydiard Brook9.6 km18 Aug 2026 · 51 days agoOxygen 48.5% Jun 2026Temp 16.7 °C Jun 2026pH 7.65 Jun 2026Ammonia 0.18 mg/l Jun 2026
Ray at Moredon Bridge, SwindonRiver Ray8.8 km29 Sep 2026 · 9 days agoOxygen 84.2%Temp 18.3 °CpH 7.86Ammonia 0.037 mg/l
Ray at Tadpole Bridge, PurtonRiver Ray4.7 kmLast sampled 13 Aug 2021, 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.

Wave tracker for this river → Buckinghamshire rivers → Oxfordshire rivers → Swindon rivers → Wiltshire rivers → All UK rivers