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Home › Rivers › River Stort

River Stort water levels

Live levels from 5 monitoring stations across Essex, Hertfordshire, updated every 15 minutes.

5stations
0above typical high

Gauges

Monitoring stations, source to mouth

StationTownLevel nowStatusTrend
ClaveringClavering0.02 mASD 27m agoLow—
13.2 km by river
Bishops Stortford, Grange PaddocksBishop's Stortford-0.26 mASD 27m agoLow—
9.2 km by river
SawbridgeworthSawbridgeworth1.08 mASD 27m agoNormal—
3.3 km by river
Harlow MillHarlow0.93 mASD 27m agoNormal▽
10.7 km by river
Roydon, Glen FabaRoydon1.45 mASD 42m 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 Stort above one of its gauges, from the source down. Named streams without a gauge that have a page here are listed at the end.

3 gauged tributaries, 3 gauges

Pincey Brook

Joins the Stort between Sawbridgeworth and Harlow Mill, no more than 3.1 km by river above Harlow Mill.

Sheering Hallstructure0.08 mASD 27m agoNormal

Its water passes Harlow Mill and every gauge below it on the Stort. It does not pass Sawbridgeworth or the gauges above it.

Where the Stort goes

No gauge below Roydon, Glen Faba 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 Stort 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

6 storm overflows are traced upstream of Roydon, Glen Faba, the Stort’s lowest gauge on the river map: on the Stort itself, on its gauged tributaries, and on smaller streams that join above there.

  • 0 report discharging now
  • 6 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 Roydon, Glen Faba: 96 spills over 953 hours in total, across all 6.

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 Stort includes the smaller streams that join it there.

Between Clavering and Bishops Stortford, Grange Paddocks1 overflow
  • Stansted Mountfitchet WwTW Not discharging
    Thames Water · into The River Stort · 3.4 km by river above Bishops Stortford, Grange Paddocks · 2025: 28 spills, 313 h
Between Bishops Stortford, Grange Paddocks and Sawbridgeworth3 overflows
  • Birchanger - Duck End Not discharging
    Thames Water · into Great Hallingbury Brook · 9.7 km by river above Sawbridgeworth · 2025: 0 spills, 0 h
  • Bishop's Stortford Main SPS Not discharging
    Thames Water · into Stort Navigation · 6.7 km by river above Sawbridgeworth · 2025: 1 spill, 1.4 h
  • Little Hallingbury WwTW Not discharging
    Thames Water · into Little Hallingbury Brook · 3.6 km by river above Sawbridgeworth · 2025: 26 spills, 209 h
Pincey Brook, above Sheering Halljoins the Stort above Harlow Mill2 overflows
  • Stansted Airport Not discharging
    Thames Water · into Pincey Brook · 15.3 km by river above Sheering Hall · 2025: 1 spill, 3.9 h
  • Takeley Not discharging
    Thames Water · into Pincey Brook · 14.4 km by river above Sheering Hall · 2025: 40 spills, 425 h

Near these gauges, connection not known

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

  • Rye Meads WwTW Not discharging
    Thames Water · into Toll House Stream · 1.2 km from Roydon, Glen Faba in a straight line · no mapped watercourse close enough to be sure · 2025: 5 spills, 38 h
  • Bakers Farm, High Wych Not discharging
    Thames Water · into High Wych Ditch · 1.7 km from Harlow Mill in a straight line · its watercourse is not on the river map · 2025: 1 spill, 0.5 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: © 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.

21 sampling points on the River Stort and the streams that join it above Roydon, Glen Faba. 13 have a sample from the last 12 months; 16 have any sample banked. Listed from the source down, grouped by the next gauge each one's water reaches.

Above Bishops Stortford, Grange Paddocks River Stort 8 points, 7 with samples
Sampling pointWatercourse (map)Above the gaugeLast sampleLatest results (river water)
River Stort at Manuden Road- StortRiver Stort9.6 km21 Sep 2026 · 17 days agoOxygen 104.4% Apr 2026Temp 8.5 °C Apr 2026pH 8.51 Apr 2026Ammonia below 0.03 mg/l Apr 2026
Stort at PinchpoolsRiver Stort7.7 km1 Sep 2026 · 37 days agoOxygen 95.3% Mar 2026Temp 8 °C Mar 2026pH 8.29 Mar 2026Conductivity 705 µS/cm Mar 2026
Bourne Brook Savenend FarmBourne Brook4.1 km11 Dec 2023 · 2.8 years agoOxygen 78.5% Nov 2023Temp 8.3 °C Nov 2023pH 8.2 Nov 2023Ammonia 0.0031 mg/l Nov 2023
Stansted Brook at Gypsy LaneStansted Brook3.0 km1 Sep 2026 · 37 days agoOxygen 89.1%Temp 15.4 °CpH 8.01Ammonia below 0.03 mg/l
Stort at Gypsy LaneRiver Stort2.8 km1 Sep 2026 · 37 days agoOxygen 66.1%Temp 13 °CpH 7.34Ammonia 0.038 mg/l
Stort at Gipsy LaneRiver Stort2.8 km2 Dec 2025 · 10 months agoOxygen 60.2%Temp 10 °CpH 7.6Ammonia 0.051 mg/l
River Stort upstream of Cannons Mill Lane BridgeRiver Stort0.8 kmLast sampled 2 Dec 2022, before the imported period
Stort at Cannons MillRiver Stort0.6 km11 Aug 2026 · 58 days agoOxygen 76.2%Temp 16.1 °CpH 7.75Ammonia below 0.03 mg/l
Above Sawbridgeworth River Stort 7 points, 5 with samples
Sampling pointWatercourse (map)Above the gaugeLast sampleLatest results (river water)
Stort at Bishops Stortford CastleRiver Stort8.4 km15 Jan 2026 · 9 months agoOxygen 90.2%Temp 6.8 °CpH 7.91Conductivity 769 µS/cm
Great Hallingbury Brook above Bishop Stortford sewage treatment worksGreat Hallingbury Brook6.3 kmLast sampled 29 Oct 2015, before the imported period
Great Hallingbury Brook above StortGreat Hallingbury Brook5.7 km21 Sep 2026 · 17 days agoOxygen 94.9%Temp 19 °CpH 7.96Ammonia below 0.03 mg/l
Stort above Twyford Mill LockRiver Stort5.5 km17 Aug 2026 · 52 days agoOxygen 82.3%Temp 19.6 °CpH 7.76Ammonia 0.06 mg/l
Stort at Spellbrook WeirRiver Stort3.6 km4 Sep 2026 · 34 days agoOxygen 80.1%Temp 19.1 °CpH 7.78Ammonia 0.044 mg/l
Stort Nav downstream of Tednambury FarmRiver Stort2.1 kmLast sampled 28 Nov 2022, before the imported period
Stort at SawbridgeworthRiver Stort0.3 km21 Sep 2026 · 17 days agoOxygen 78.2%Temp 16.7 °CpH 7.88Ammonia 0.037 mg/l
Above Sheering Hall Pincey Brook 3 points, 2 with samples
Sampling pointWatercourse (map)Above the gaugeLast sampleLatest results (river water)
Pincey Brook at the MarshPincey Brook10 km13 Dec 2024 · 22 months agoOxygen 24.8%Temp 6.3 °CpH 7.46Ammonia 0.098 mg/l
Pincey Brook below Church LanePincey Brook2.5 km1 Dec 2023 · 2.9 years agoOxygen 91.1%Temp 3.6 °CpH 8.13Ammonia below 0.03 mg/l
Pincey Brook upstream M11Pincey Brook0.9 kmLast sampled 15 Dec 2022, before the imported period
Above Harlow Mill River Stort 1 point, 0 with samples
Sampling pointWatercourse (map)Above the gaugeLast sampleLatest results (river water)
Pincey Brook at Ealing BridgePincey Brook2.4 kmLast sampled 22 Sep 2016, before the imported period
Above Roydon, Glen Faba River Stort 2 points
Sampling pointWatercourse (map)Above the gaugeLast sampleLatest results (river water)
Stort at Burnt MillRiver Stort7.3 km21 Sep 2026 · 17 days agoOxygen 128.4%Temp 16.9 °CpH 8.34Ammonia below 0.03 mg/l
Stort at RoydonRiver Stort2.3 km5 Aug 2026 · 2 months agoOxygen 91.4%Temp 21.2 °CpH 8.13Ammonia below 0.03 mg/l

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.

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