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.
Streams and rivers with a gauge whose water joins the Cherwell above one of its gauges, from the source down. Named streams without a gauge that have a page here are listed at the end.
Named streams on the river map that flow into the Cherwell 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.
Ashby Brook (joins about 9.3 km above Cropredy Bridge)
River Swere (joins about 14 km above Heyford Bridge)
Storm overflows upstream
21 storm overflows are traced upstream of Oxford Botanical Gardens, the Cherwell’s lowest gauge on the river map: on the Cherwell itself, on its gauged tributaries, and on smaller streams that join above there.
0 report discharging now
21 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 Oxford Botanical Gardens: 537 spills over 6,006 hours in total, across all 21.
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 Cherwell includes the smaller streams that join it there.
Between Woodford Halse and Cropredy Bridge4 overflows
Moreton Pinkney WwTWNot discharging Thames Water · into Ashby Brook · 16.6 km by river above Cropredy Bridge · 2025: 26 spills, 106 h
Byfield Wastewater Treatment WorksNot discharging Thames Water · into Byfield Brook · 16.3 km by river above Cropredy Bridge · 2025: 36 spills, 355 h · placed on the river by its position alone
Woodford Halse SPSNot discharging Thames Water · into River Cherwell · 15.5 km by river above Cropredy Bridge · 2025: 15 spills, 142 h
Chipping Warden WwTWNot discharging Thames Water · into Tributary Of River Cherwell · 4.8 km by river above Cropredy Bridge · 2025: 11 spills, 28 h
Between Cropredy Bridge and Banbury2 overflows
Cropredy STWNot discharging Thames Water · into River Cherwell · 8.4 km by river above Banbury · 2025: 35 spills, 453 h
Chacombe Wastewater Treatment WorksNot discharging Thames Water · into Chacombe Brook · 6.6 km by river above Banbury · 2025: 21 spills, 61 h
Between Banbury and Heyford Bridge5 overflows
Fergusson Road, BanburyNot discharging Thames Water · into Cherwell · 25.5 km by river above Heyford Bridge · 2025: 0 spills, 0 h
Lower Cherwell St Wps, BanburyNot discharging Thames Water · into River Cherwell · 24.4 km by river above Heyford Bridge · 2025: 4 spills, 4.5 h
Bloxham Wastewater Treatment WorksNot discharging Thames Water · into Bloxham Brook · 22.9 km by river above Heyford Bridge · 2025: 28 spills, 349 h
Kings Sutton WwTWNot discharging Thames Water · into Kings Sutton Stream · 17.5 km by river above Heyford Bridge · 2025: 6 spills, 45 h · placed on the river by its position alone
Heyford Wastewater Treatment WorksNot discharging Thames Water · into Cherwell · 2.0 km by river above Heyford Bridge · 2025: 33 spills, 303 h
Sor Brook, above Bodicotejoins the Cherwell above Heyford Bridge2 overflows
Horley (Oxon) WwTWNot discharging Thames Water · into Sor Brook · 13.3 km by river above Bodicote · 2025: 23 spills, 162 h
Shutford Wastewater Treatment WorksNot discharging Thames Water · into Shutford Stream · 12.1 km by river above Bodicote · 2025: 32 spills, 255 h · placed on the river by its position alone
River Ray, above Lower Arncottjoins the Cherwell above Kings Mill2 overflows
Grendon Underwood WwTWNot discharging Thames Water · into Oxon Ray · 11.0 km by river above Lower Arncott · 2025: 31 spills, 306 h
Ludgershall WwTWNot discharging Thames Water · into Ludgershall Brook · 8.5 km by river above Lower Arncott · 2025: 52 spills, 617 h
River Ray, above Islipjoins the Cherwell above Kings Mill6 overflows
Middleton Stoney WwTWNot discharging Thames Water · into Gagle Brook · 18.1 km by river above Islip · 2025: 18 spills, 145 h
Bicester Wastewater Treatment WorksNot discharging Thames Water · into Langford Brook · 12.7 km by river above Islip · 2025: 34 spills, 450 h
Charlton-On-Otmoor WwTWNot discharging Thames Water · into Oxon Ray · 5.8 km by river above Islip · 2025: 54 spills, 814 h
Weston-On-The-Green WwTWNot discharging Thames Water · into Gallos Brook · 5.2 km by river above Islip · 2025: 42 spills, 696 h
Islip Wastewater Treatment WorksNot discharging Thames Water · into River Ray · 850 m by river above Islip · 2025: 34 spills, 697 h
Near these gauges, connection not known
Within 3 km of one of the Cherwell’s gauges in a straight line, but the river map cannot say whether their water reaches it.
Banbury Wastewater Treatment WorksNo live feed Thames Water · into River Cherwell · 1.8 km from Banbury in a straight line · its watercourse is not on the river map · 2025: 26 spills, 314 h
Tackley SPSNot discharging Thames Water · into Tributary Of The Rver Cherwell · 2.1 km from Enslow Weir A in a straight line · its watercourse is not on the river map · 2025: 4 spills, 47 h
Wardington Sewage Pumping StationNot discharging Thames Water · into Trib Of River Cherwell · 2.2 km from Cropredy Bridge in a straight line · no mapped watercourse close enough to be sure · 2025: 55 spills, 358 h
Eydon Wastewater Treatment WorksNot discharging Thames Water · into Tributary Of River Cherwell · 2.3 km from Woodford Halse in a straight line · its watercourse is not on the river map · 2025: 60 spills, 872 h
Bletchingdon WwTWNot discharging Thames Water · into Bletchingdon Brook · 2.7 km from Thrupp in a straight line · its watercourse is not on the river map · 2025: 32 spills, 302 h
1 other overflow within 3 km of these gauges is placed below the Cherwell’s lowest gauge or on another river, so not listed.
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.
47 sampling points on the River Cherwell and the streams that join it above Oxford Botanical Gardens. 31 have a sample from the last 12 months; 37 have any sample banked.
Sampled most recently, anywhere on the Cherwell and its streams:
Upstream of Broughton Castleunnamed stream · 7.5 km above BodicoteLast sampled 28 Sep 2026 · 11 days agoOxygen 92.8%Temp 12.1 °CpH 7.98Ammonia below 0.03 mg/l
Ludgershall Brook at A41, near LudgershallLudgershall Brook · 6.7 km above Lower ArncottLast sampled 4 Sep 2026 · 35 days agoOxygen 71.1% Jun 2026Temp 22.6 °C Jun 2026pH 7.84 Jun 2026Ammonia 0.037 mg/l Jun 2026
England's samples only. Each count opens the list of those points, nearest first, with the date of each one’s latest sample (the gauge’s “Upstream of here” list).
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.