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 Medlock above one of its gauges, from the source down. The river map knows where gauges are, not every stream, so a tributary without a gauge is not listed here.
No gauged tributary joins the Medlock above London Road on the river map. Streams without a gauge are not counted here.
Where the Medlock goes
No gauge below London Road is known on the river map.
12 storm overflows are traced upstream of London Road, the Medlock’s lowest gauge on the river map: on the Medlock itself, on its gauged tributaries, and on smaller streams that join above there.
0 report discharging now
12 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 London Road: 86 spills over 168 hours in total, across all 12.
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 Medlock includes the smaller streams that join it there.
Above Gurney Street, the Medlock’s highest gauge2 overflows
Fairfield Street CSONot discharging United Utilities · into River Medlock · 1.3 km by river above Gurney Street · 2025: 26 spills, 40 h
Palmerston Street CSONot discharging United Utilities · into The River Medlock · 500 m by river above Gurney Street · 2025: 1 spill, 2.0 h
Between Gurney Street and London Road10 overflows
Chester Road/Great Jackson Road CSONot discharging United Utilities · into River Medlock · 2.1 km by river above London Road · 2025: 13 spills, 66 h
Great Bridgewater St CSO (281wi)Not discharging United Utilities · into River Medlock · 1.6 km by river above London Road · 2025: 0 spills, 0 h
Cambridge Street CSO 282d9Not discharging United Utilities · into River Medlock · 1.5 km by river above London Road · 2025: 0 spills, 0 h
Chester Street CSONot discharging United Utilities · into The River Medlock · 1.2 km by river above London Road · 2025: 1 spill, 11 h
Oxford Road/Grosvenor Street CSONot discharging United Utilities · into River Medlock Via Sws · 1.1 km by river above London Road · 2025: 13 spills, 9.3 h · reaches the river through a sewer, so where it enters is approximate
Mallard Street/Charles Street CSONot discharging United Utilities · into River Medlock · 1.0 km by river above London Road · 2025: 0 spills, 0 h
Princess St/Whitworth St CSO 282mnNot discharging United Utilities · into River Medlock Via Sws · 770 m by river above London Road · 2025: 12 spills, 14 h · reaches the river through a sewer, so where it enters is approximate
Charles St Princess St CSO 28116Not discharging United Utilities · into River Medlock · 760 m by river above London Road · 2025: 17 spills, 26 h
Charles Street CSONot discharging United Utilities · into River Medlock · 760 m by river above London Road · 2025: 1 spill, 0.2 h
Mount Street/Greek Street CSONot discharging United Utilities · into River Medlock · 400 m by river above London Road · 2025: 2 spills, 0.4 h
Near these gauges, connection not known
Within 3 km of one of the Medlock’s gauges in a straight line, but the river map cannot say whether their water reaches it.
Mancunian Way CSONot discharging United Utilities · into River Medlock Via Sws · 40 m from London Road in a straight line · too close to London Road to say which side · 2025: 5 spills, 5.8 h
Beswick St Ashton New Rd CSO 281d0Not discharging United Utilities · into River Medlock · 190 m from Gurney Street in a straight line · its water cannot be followed on the map · 2025: 0 spills, 0 h
Hillkirk Street CSO (282i9)Not discharging United Utilities · into River Medlock · 270 m from Gurney Street in a straight line · its water cannot be followed on the map · 2025: 0 spills, 0 h
Chorlton Street CSO 281j2Not discharging United Utilities · into Shooters Brook Trib Rvr Medloc · 490 m from London Road in a straight line · no mapped watercourse close enough to be sure · 2025: 1 spill, 0.1 h
Rolleston Avenue/Butler Street CSONot discharging United Utilities · into River Medlock · 750 m from Gurney Street in a straight line · no mapped watercourse close enough to be sure · 2025: 5 spills, 3.7 h
Lostock Close / Chale Close CSO (282d0)Not discharging United Utilities · into River Medlock · 820 m from Gurney Street in a straight line · its recorded watercourse is not the one mapped beside it · 2025: 0 spills, 0 h
Gorton Road (Lighting Tower)Not discharging United Utilities · into Black Brook · 1.2 km from London Road in a straight line · its watercourse is not on the river map · 2025: 7 spills, 27 h
Vaughan Street CSONot discharging United Utilities · into Clvrt Section Of Corn Brook · 1.5 km from Gurney Street in a straight line · its watercourse is not on the river map · 2025: 1 spill, 4.3 h
Vaughan Street CSONot discharging United Utilities · into Corn Brook In Culvert · 1.5 km from Gurney Street in a straight line · its watercourse is not on the river map · 2025: 0 spills, 0 h
Lord North Street/Clifton St CSONot discharging United Utilities · into Shooters Brook · 1.5 km from Gurney Street in a straight line · no mapped watercourse close enough to be sure · 2025: 4 spills, 1.2 h
Blackfriars Street CSO 283j1Not discharging United Utilities · into River Irwell · 1.6 km from London Road in a straight line · its water cannot be followed on the map · 2025: 20 spills, 3.3 h
Victoria Bridge Street CSO (282wl)Not discharging United Utilities · into River Blakewater · 1.6 km from London Road in a straight line · its recorded watercourse is not the one mapped beside it · 2025: 34 spills, 32 h
Long Millgate CSONot discharging United Utilities · into River Irk · 1.7 km from London Road in a straight line · its water cannot be followed on the map · 2025: 0 spills, 0 h
Miller Street/Corporation St CSONot discharging United Utilities · into River Irk · 1.7 km from London Road in a straight line · its water cannot be followed on the map · 2025: 14 spills, 5.3 h
Junction Of Ashton New Road CSONot discharging United Utilities · into Windle Brook · 1.8 km from Gurney Street in a straight line · its watercourse is not on the river map · 2025: 1 spill, 2.3 h
48 more near these gauges whose connection is not known.
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.
1 sampling point on the River Medlock and the streams that join it above London Road. 1 has a sample from the last 12 months; 1 has 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.
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