FloodRadar
Log inCreate free account

Explore FloodRadar

Explore the map
Weather
Why ?
Home › Rivers › River Loddon

River Loddon water levels

Live levels from 7 monitoring stations across Hampshire, Wokingham, updated every 15 minutes.

7stations
0above typical high

Gauges

Monitoring stations, source to mouth

StationTownLevel nowStatusTrend
Pyotts BridgeOld Basing0.93 mASD 4h agoLow
7.8 km by river
Longbridge MillSherfield On Loddon0.23 mASD 34m agoNormal—
11.5 km by river
SheepbridgeSwallowfield0.17 mASD 49m agoNormal—
downstream, distance by river not measured
Sheepbridge Weir Mill StreamstructureSwallowfield0.17 mASD 34m agoNormal—
4.1 km by river
Arborfield BridgeShinfield0.24 mASD 34m agoLow—
3.8 km by river
Sindlesham MillstructureSindlesham0.13 mASD 34m agoLow—
8.7 km by river
TwyfordCharvil1.00 m 49m 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 Loddon 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, 17 gauges

Petty's Brook

Joins the Loddon between Pyotts Bridge and Longbridge Mill, no more than 8.6 km by river above Longbridge Mill.

Chineham0.24 mASD 34m agoLow

Its water passes Longbridge Mill and every gauge below it on the Loddon. It does not pass Pyotts Bridge or the gauges above it.

River Blackwater

Joins the Loddon between Sheepbridge Weir Mill Stream and Arborfield Bridge, no more than 4.3 km by river above Arborfield Bridge.

Tongham0.70 mASD 34m agoNormal
8.0 km by river
Farnborough0.67 mASD 49m agoNormal
5.1 km by river
Blackwater Bridge1.38 mASD 34m agoNormal
10.6 km by river
Eversley0.60 mASD 34m agoLow
6.1 km by river
Swallowfield0.25 mASD 34m agoNormal
downstream, distance by river not measured
Swallowfield Side Channelstructure0.26 mASD 34m agoNormal

Its water passes Arborfield Bridge and every gauge below it on the Loddon. It does not pass Sheepbridge Weir Mill Stream or the gauges above it.

Gauged streams joining the Blackwater

Emm Brook

Joins the Loddon between Sindlesham Mill and Twyford, no more than 12.7 km by river above Twyford.

Wokingham0.50 mASD 34m agoNormal

Its water passes Twyford and every gauge below it on the Loddon. It does not pass Sindlesham Mill or the gauges above it.

Where the Loddon goes

Below Twyford, its water next reaches Marsh Lock, a gauge on River Thames, 6.4 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.

Streams without a gauge

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

  • Barkham Brook (joins about 9.8 km above Twyford)
  • Bow Brook (joins about 10 km above Sheepbridge Weir Mill Stream)
  • Lyde River (joins about 1.3 km above Longbridge Mill)

Storm overflows upstream

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

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

Official figures for 2025, for the overflows traced upstream of Twyford: 323 spills over 3,600 hours in total, across all 18.

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 Loddon includes the smaller streams that join it there.

Between Pyotts Bridge and Longbridge Mill2 overflows
  • Water End Not discharging
    Thames Water · into Lyde River · 6.8 km by river above Longbridge Mill · 2025: 0 spills, 0 h
  • Basingstoke WwTW Not discharging
    Thames Water · into River Loddon · 6.1 km by river above Longbridge Mill · 2025: 40 spills, 397 h
Between Sheepbridge and Sheepbridge Weir Mill Stream2 overflows
  • Opposite St Stephen's Hall Not discharging
    Thames Water · into Bow Brook · 18.8 km by river above Sheepbridge Weir Mill Stream · 2025: 21 spills, 18 h
  • Sherfield-On-Loddon WwTW Not discharging
    Thames Water · into Bow Brook · 10.6 km by river above Sheepbridge Weir Mill Stream · 2025: 26 spills, 405 h
River Blackwater, above Farnboroughjoins the Loddon above Arborfield Bridge3 overflows
  • Aldershot Town WwTW Not discharging
    Thames Water · into Blackwater River · 6.8 km by river above Farnborough · 2025: 9 spills, 38 h
  • N/A Not discharging
    Thames Water · into N/A · 6.8 km by river above Farnborough · 2025: 2 spills, 8.3 h · placed on the river by its position alone
  • Ash Vale Not discharging
    Thames Water · into Blackwater · 2.5 km by river above Farnborough · 2025: 9 spills, 103 h
River Blackwater, above Blackwater Bridgejoins the Loddon above Arborfield Bridge1 overflow
  • Camberley Not discharging
    Thames Water · into Blackwater · 960 m by river above Blackwater Bridge · 2025: 7 spills, 69 h
River Blackwater, above Eversleyjoins the Loddon above Arborfield Bridge1 overflow
  • Sandhurst Not discharging
    Thames Water · into Blackwater · 8.1 km by river above Eversley · 2025: 10 spills, 115 h
River Blackwater, above Swallowfieldjoins the Loddon above Arborfield Bridge1 overflow
  • Eversley (Lower Common) WwTW Not discharging
    Thames Water · into Tributary Of River Blackwater · 4.4 km by river above Swallowfield · 2025: 27 spills, 325 h
River Hart, above Crookham Villagejoins the Blackwater1 overflow
River Hart, above Bramshilljoins the Blackwater3 overflows
  • Avondale Road Monitor offline
    Thames Water · into Fleet Brook · 10.7 km by river above Bramshill · 2025: 0 spills, 0 h
  • Fleet STW Not discharging
    Thames Water · into Fleet Brook · 7.6 km by river above Bramshill · 2025: 39 spills, 525 h
  • Hartley Wintney WwTW Not discharging
    Thames Water · into Tributary Of The River Hart · 2.2 km by river above Bramshill · 2025: 21 spills, 300 h
River Whitewater, above River Whitewater at Holdshot Farmjoins the Blackwater2 overflows
  • Crooked Billet SPS Not discharging
    Thames Water · into River Whitewater · 7.8 km by river above River Whitewater at Holdshot Farm · 2025: 7 spills, 13 h
  • Rotherwick Not discharging
    Thames Water · into Rotherwick Brook · 5.1 km by river above River Whitewater at Holdshot Farm · 2025: 8 spills, 74 h · placed on the river by its position alone
Between Sindlesham Mill and Twyford2 overflows
  • Arborfield WwTW Not discharging
    Thames Water · into Barkham Brook · 13.4 km by river above Twyford · 2025: 28 spills, 251 h
  • Wokingham (Ash Ridge) Not discharging
    Thames Water · into Ashridge Stream · 10.3 km by river above Twyford · 2025: 11 spills, 136 h · placed on the river by its position alone

1 other overflow within 3 km of these gauges is placed below the Loddon’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.

39 sampling points on the River Loddon and the streams that join it above Twyford, and below it. 33 have a sample from the last 12 months; 35 have any sample banked. Listed from the source down, grouped by the next gauge each one's water reaches.

Above Tongham River Blackwater 1 point, 0 with samples
Sampling pointWatercourse (map)Above the gaugeLast sampleLatest results (river water)
Blackwater at Whitchurch CLBlackwater River1.2 kmLast sampled 11 Mar 2022, before the imported period
Above Cove Hazel Avenue Cove Brook 1 point, 0 with samples
Sampling pointWatercourse (map)Above the gaugeLast sampleLatest results (river water)
Cove Brook below R.A.E. InterceptorCove Brook0.7 kmLast sampled 3 Jan 2006, before the imported period
Above Farnborough River Blackwater 5 points
Sampling pointWatercourse (map)Above the gaugeLast sampleLatest results (river water)
Blackwater above Aldershot Town South sewage treatment worksBlackwater River7.4 km7 Jul 2026 · 3 months agoOxygen 56.4%Temp 19 °CpH 7.63Ammonia 0.071 mg/l
Holder RoadBlackwater River7.2 km5 Dec 2024 · 22 months agoOxygen 81.3%Temp 10 °CpH 7.55Ammonia 0.043 mg/l Nov 2024
Blackwater above Aldershot Military S/WBlackwater River5.0 km1 Jul 2026 · 3 months agoOxygen 42.7%Temp 19.4 °CpH 7.25Ammonia 0.14 mg/l
Blackwater at Lynchford Bridge, Ash ValeBlackwater River2.9 km9 Jul 2026 · 3 months agoOxygen 56.2%Temp 22.2 °CpH 7.55Ammonia 0.065 mg/l
Blackwater at Coleford BridgeBlackwater River0.2 km3 Jul 2026 · 3 months agoOxygen 69.5%Temp 19.2 °CpH 7.41Ammonia below 0.03 mg/l
Above Chineham Petty's Brook 1 point
Sampling pointWatercourse (map)Above the gaugeLast sampleLatest results (river water)
90 m downstream of Railway - Petty's BrookPetty's Brook0.3 km16 Sep 2026 · 22 days agoOxygen 88.9%Temp 15 °CpH 8.01Ammonia below 0.03 mg/l
Above Blackwater Bridge River Blackwater 3 points
Sampling pointWatercourse (map)Above the gaugeLast sampleLatest results (river water)
Cove Brook at Mayfield RoadCove Brook3.4 km30 Jan 2026 · 8 months agoOxygen 83.5%Temp 8.1 °CpH 7.06Conductivity 426 µS/cm
Cove Brook above BlackwaterCove Brook2.2 km16 Jul 2026 · 3 months agoOxygen 66.4%Temp 20 °CpH 7.37Ammonia 0.046 mg/l
Blackwater above Camberley S/WBlackwater River1.2 km24 Aug 2026 · 45 days agoOxygen 81.3%Temp 15.1 °CpH 7.63Ammonia below 0.03 mg/l
Above Longbridge Mill River Loddon 4 points
Sampling pointWatercourse (map)Above the gaugeLast sampleLatest results (river water)
Loddon at Pyots Bridge, BasingRiver Loddon7.8 km9 Jul 2026 · 3 months agoOxygen 105.6%Temp 16.3 °CpH 7.75Ammonia below 0.03 mg/l
Lyde at Deanland FarmLyde River5.6 km9 Jul 2026 · 3 months agoOxygen 103.2%Temp 16.5 °CpH 8.02Ammonia below 0.03 mg/l
Loddon at Keepers Cottage, WildmoorRound Copse Channel5.2 km20 Jul 2026 · 3 months agoOxygen 93.5%Temp 17.6 °CpH 7.79Ammonia 0.04 mg/l
Round CopseRiver Loddon4.7 km21 Oct 2024 · 24 months agoOxygen 85.5%Temp 13.3 °CpH 7.8Ammonia below 0.03 mg/l
Above Bramshill River Hart 5 points
Sampling pointWatercourse (map)Above the gaugeLast sampleLatest results (river water)
Minley Brook at B3013, FleetMinley Brook8.4 km10 Jul 2026 · 3 months agoOxygen 29.8%Temp 20.8 °CpH 6.63Ammonia 0.32 mg/l
Fleet Brook above Fleet sewage treatment worksFleet Brook7.6 km10 Jul 2026 · 3 months agoOxygen 47.4%Temp 20.3 °CpH 6.93Ammonia below 0.03 mg/l
Hart at Elvetham Park BridgeRiver Hart6.0 km20 Jul 2026 · 3 months agoOxygen 67.3%Temp 15.8 °CpH 7.75Ammonia below 0.03 mg/l
Fleet Brook above River HartFleet Brook5.3 km7 Jul 2026 · 3 months agoOxygen 45.7%Temp 21 °CpH 7.17Ammonia 1.5 mg/l
Hart at Hartford BridgeRiver Hart3.4 km1 Sep 2026 · 37 days agoOxygen 59.2%Temp 16.3 °CpH 7.14Ammonia 0.058 mg/l
Above River Whitewater at Holdshot Farm 1 point, 0 with samples
Sampling pointWatercourse (map)Above the gaugeLast sampleLatest results (river water)
Whitewater at DipleyRiver Whitewater3.9 kmLast sampled 9 Mar 2020, before the imported period
Above Eversley River Blackwater 2 points
Sampling pointWatercourse (map)Above the gaugeLast sampleLatest results (river water)
Blackwater at A30 Roadbridge, BlackwaterBlackwater River11 km1 Sep 2026 · 37 days agoOxygen 77.5%Temp 16.9 °CpH 7.41Ammonia 0.045 mg/l
Blackwater below Sandhurst sewage treatment worksBlackwater River5.5 km14 Aug 2026 · 55 days agoOxygen 74.1%Temp 21 °CpH 7.42Ammonia below 0.03 mg/l
Above Swallowfield River Blackwater 4 points
Sampling pointWatercourse (map)Above the gaugeLast sampleLatest results (river water)
Hart at Lea Bridge, HazeleyRiver Hart6.9 km10 Jul 2026 · 3 months agoOxygen 92.5%Temp 23.5 °CpH 7.42Ammonia below 0.03 mg/l
Blackwater above WhitewaterBlackwater River2.1 km1 Sep 2026 · 37 days agoOxygen 83.5%Temp 17.3 °CpH 7.73Ammonia below 0.03 mg/l
Whitewater above BlackwaterRiver Whitewater2.0 km1 Sep 2026 · 37 days agoOxygen 82.1%Temp 16.3 °CpH 7.84Ammonia below 0.03 mg/l
Blackwater at Gauging Station, SwallowfieldBlackwater River0.2 km14 May 2026 · 5 months agoOxygen 84.4%Temp 11.1 °CpH 7.62Ammonia 0.054 mg/l
Above Sheepbridge Weir Mill Stream River Loddon 4 points
Sampling pointWatercourse (map)Above the gaugeLast sampleLatest results (river water)
Vyne Stream below the Vyne, Sherborne St JohnThe Vyne Stream16 km22 Jul 2026 · 3 months agoOxygen 54%Temp 20.5 °CpH 7.65Ammonia 0.35 mg/l
Loddon at Long Bridge, SherfieldRiver Loddon11 km30 Jul 2026 · 2 months agoOxygen 102.5%Temp 18.4 °CpH 7.84Ammonia below 0.03 mg/l
Bow Brook at Bow Bridge, Sherfield on LoddonBow Brook11 km30 Jul 2026 · 2 months agoOxygen 76.7%Temp 19.4 °CpH 7.69Ammonia below 0.03 mg/l
Loddon above Blackwater at Kings BridgeRiver Loddon0.8 km14 Jul 2026 · 3 months agoOxygen 84.8%Temp 19.9 °CpH 8.1Ammonia below 0.03 mg/l
Above Sindlesham Mill River Loddon 1 point, 0 with samples
Sampling pointWatercourse (map)Above the gaugeLast sampleLatest results (river water)
Loddon at Arborfield BridgeRiver Loddon3.7 kmLast sampled 19 Nov 2012, before the imported period
Above Twyford River Loddon 6 points
Sampling pointWatercourse (map)Above the gaugeLast sampleLatest results (river water)
Emm Brook at Wokingham gauging stationEmm Brook13 km7 Jan 2026 · 9 months agoOxygen 91.3%Temp 3.5 °CpH 7.46Conductivity 646 µS/cm
Barkham Brook at Barrett's Lane, ArborfieldBarkham Brook12 km14 Jul 2026 · 3 months agoOxygen 69.2%Temp 20.6 °CpH 7.48Ammonia below 0.03 mg/l
Ashridge Stream at Toutley Road, Wokinghamunnamed stream9.0 km9 Feb 2026 · 8 months agopH 7.62 Jan 2026
Emmbrook at Merryhill Bridge, WinnershEmm Brook6.7 km1 Jul 2026 · 3 months agoOxygen 81.9%Temp 19.6 °CpH 7.78Ammonia below 0.03 mg/l
Downstream the Straight Mile RoadBillingbear Brook5.9 km5 Dec 2025 · 10 months agoOxygen 92.7%Temp 4.9 °CpH 7.9Ammonia 0.061 mg/l
Upstream of Sandford LaneEmm Brook5.4 km14 Aug 2026 · 55 days agoOxygen 78.7%Temp 20.8 °CpH 7.76Ammonia below 0.03 mg/l
Below Twyford 1 point
Sampling pointWatercourse (map)Below the gaugeLast sampleLatest results (river water)
Loddon at Loddon Drive, WargraveRiver Loddon1.8 km13 May 2026 · 5 months agoOxygen 99.6%Temp 12.9 °CpH 8.15Ammonia 0.26 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.

Wave tracker for this river → Hampshire rivers → Wokingham rivers → All UK rivers