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 Great Stour 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, 6 gauges
East Stour River name from the river map
Joins the Great Stour between Chart Leacon and Wye, no more than 9.5 km by river above Wye.
Aylesford Stream: joins the East Stour River above ASHFORD CROSSING USGS (its lowest gauge is 1.4 km by river above it). Gauge, source first: Aylesford StreamNormal.
Whitewater Dyke: joins the East Stour River above ASHFORD CROSSING USGS (its lowest gauge is 2.9 km by river above it). Gauge, source first: White Water DykeLow.
Named streams on the river map that flow into the Great Stour 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.
Whitehall Dyke (joins about 1.6 km above West Gate Gardens)
Storm overflows upstream
24 storm overflows are traced upstream of GroveFerry, the Great Stour’s lowest gauge on the river map: on the Great Stour itself, on its gauged tributaries, and on smaller streams that join above there.
0 report discharging now
22 not discharging
2 offline or silent: 0 monitor offline, 2 status unknown, 0 no live feed
Official figures for 2025, for the overflows traced upstream of GroveFerry: 196 spills over 1,096 hours in total, across all 24.
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 Great Stour includes the smaller streams that join it there.
Between Brown Mill and Hothfield Upstream1 overflow
Brown Mill Little Chart Forstal CEONot discharging Southern Water · into The Great Stour · 3.1 km by river above Hothfield Upstream · 2025: 21 spills, 173 h
Between Chart Leacon and Wye12 overflows
Victoria Road Ashford CSOStatus unknown Southern Water · into Trib Of The Great Stour · 10.0 km by river above Wye · 2025: 0 spills, 0 h
Dover Place CSO, Ashford, KentNot discharging Southern Water · into The Great Stour · 9.2 km by river above Wye · 2025: 13 spills, 15 h
Martyrs Field CSONot discharging Southern Water · into The East Stour · 8.5 km by river above Wye · 2025: 4 spills, 5.6 h
Somerset Road Ashford CSONot discharging Southern Water · into River Great Stour · 8.4 km by river above Wye · 2025: 0 spills, 0 h
Bockhanger CEONot discharging Southern Water · into Bockhanger Dyke · 8.4 km by river above Wye · 2025: 0 spills, 0 h · placed on the river by its position alone
Queens Road CSO (R/O Hedleys)Not discharging Southern Water · into The Great Stour · 8.1 km by river above Wye · 2025: 0 spills, 0 h
Bybrook Pumping StationNot discharging Southern Water · into Freshwater River · 7.4 km by river above Wye · 2025: 0 spills, 0 h · placed on the river by its position alone
Ashford Wastewater Treatment WorksNot discharging Southern Water · into Great Stour · 7.0 km by river above Wye · 2025: 17 spills, 156 h
Blackwall RoadNot discharging Southern Water · into Great Stour River · 5.6 km by river above Wye · 2025: 1 spill, 2.7 h
Stonebridge Road WwpsNot discharging Southern Water · into Tributary Of The Great Stour · 4.8 km by river above Wye · 2025: 2 spills, 11 h
Ball Lane- Kennington CSONot discharging Southern Water · into Great Stour · 3.7 km by river above Wye · 2025: 11 spills, 101 h
Mill Lane Kennington CEONot discharging Southern Water · into Mill Stream · 3.3 km by river above Wye · 2025: 24 spills, 283 h · placed on the river by its position alone
East Stour River, above ASHFORD CROSSING USGSjoins the Great Stour above Wye3 overflows
Wotton Road CSONot discharging Southern Water · into Trib Of The East Stour · 990 m by river above ASHFORD CROSSING USGS · 2025: 18 spills, 65 h
Kingsnorth Road, Ashford CSONot discharging Southern Water · into Tributary Of East Stour · 760 m by river above ASHFORD CROSSING USGS · 2025: 23 spills, 84 h
Christchurch Road Asford CSONot discharging Southern Water · into Trib Of The Great Stour · 450 m by river above ASHFORD CROSSING USGS · 2025: 13 spills, 15 h
East Stour Trib Great Stour, above Aldington Upstreamjoins the East Stour River1 overflow
Sellindge WwTWNot discharging Southern Water · into The East Stour River · 2.2 km by river above Aldington Upstream · 2025: 17 spills, 114 h
Aylesford Stream, above Aylesford Streamjoins the East Stour River1 overflow
Breadlands Road Ashford CSONot discharging Southern Water · into Trib Of The East Stour River · 1.0 km by river above Aylesford Stream · 2025: 10 spills, 9.0 h
Between Wye and Horton weir1 overflow
Churchfield Way Wye CEONot discharging Southern Water · into The Great Stour · 13.9 km by river above Horton weir · 2025: 0 spills, 0 h
Between Horton weir and West Gate Gardens2 overflows
Hospital Farm Harbledown CEONot discharging Southern Water · into A Trib Of The Great Stour · 2.5 km by river above West Gate Gardens · 2025: 11 spills, 20 h
Wincheap Canterbury CSONot discharging Southern Water · into The Great Stour · 820 m by river above West Gate Gardens · 2025: 3 spills, 0.9 h
Between Vauxhall Bridge and Fordwich River Level1 overflow
Canterbury Wastewater Treatment WksNot discharging Southern Water · into River Great Stour · 1.7 km by river above Fordwich River Level · 2025: 7 spills, 42 h
Above Vauxhall Road Bridge1 overflow
Kingsmead Road Canterbury CSONot discharging Southern Water · into Great Stour River · 1.7 km by river above Vauxhall Road Bridge · 2025: 1 spill, 0 h
Above BROWN MILL USGS1 overflow
Lenham Wastewater Treatment WorksStatus unknown Southern Water · into Tributary Of The Great Stour · 12.0 km by river above BROWN MILL USGS · 2025: 0 spills, 0 h
Near these gauges, connection not known
Within 3 km of one of the Great Stour’s gauges in a straight line, but the river map cannot say whether their water reaches it.
Fordwich Road Sturry CEONot discharging Southern Water · into Great Stour River · 620 m from Fordwich River Level in a straight line · discharges into a tidal reach, where the water moves both ways · 2025: 5 spills, 16 h
Godinton Road Ashford CSONot discharging Southern Water · into Trib Of The Great Stour · 1.1 km from Chart Leacon in a straight line · no mapped watercourse close enough to be sure · 2025: 0 spills, 0 h
South Ashford P.s.Not discharging Southern Water · into Freshwater River · 2.1 km from Chart Leacon in a straight line · several watercourses close by, nothing to choose between them · 2025: 7 spills, 42 h
Westbere WwTWNot discharging Southern Water · into The Great Stour · 2.2 km from Fordwich River Level in a straight line · discharges into a tidal reach, where the water moves both ways · 2025: 7 spills, 45 h
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.
19 sampling points on the Great Stour and the streams that join it above GroveFerry. 9 have a sample from the last 12 months; 12 have any sample banked. Listed from the source down, grouped by the next gauge each one's water reaches.
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.
