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Home › Rivers › River Lark

River Lark water levels

Live levels from 6 monitoring stations across Suffolk, updated every 15 minutes.

6stations
0above typical high
2catchments
⚠️ Several distinct UK rivers share the name “River Lark” — sections below are grouped by catchment.

Gauges

River Lark — Cam and Ely Ouse (Including South Level)

5 stations in this catchment

StationTownLevel nowStatusTrend
SicklesmereSicklesmere0.21 mASD 30m agoLow—
8.3 km by river
Fornham St MartinFornham St Martin0.04 mASD 31m agoLow—
12.7 km by river
TempleIcklingham0.19 mASD 31m agoNormal—
3.5 km by river
Barton Mills SluicestructureBarton Mills0.08 mASD 31m agoLow—
10.0 km by river
IslehamIsleham2.12 mASD 31m agoNormal—

River Lark — East Suffolk

1 station in this catchment

StationTownLevel nowStatusTrend
Cloptonplace estimated—0.27 mASD 31m 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 Lark above one of its gauges, from the source down. Named streams without a gauge that have a page here are listed at the end.

River Lark — Cam and Ely Ouse (Including South Level)

No gauged tributary joins the Lark above Isleham on the river map. Streams without a gauge are not counted here.

Where the Lark goes

Below Isleham, its water next reaches Freebridge, a gauge on River Great Ouse, 50.6 km by river downstream.

River Lark — East Suffolk

No gauged tributary joins the Lark above Clopton on the river map. Streams without a gauge are not counted here.

Where the Lark goes

No gauge below Clopton 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.

River Lark — Cam and Ely Ouse (Including South Level)

Streams without a gauge

Named streams on the river map that flow into the Lark 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

River Lark — Cam and Ely Ouse (Including South Level)

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

  • 0 report discharging now
  • 5 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 Isleham: 30 spills over 226 hours in total, across all 5.

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 Lark includes the smaller streams that join it there.

Above Sicklesmere, the Lark’s highest gauge2 overflows
  • Church Road PS, Whepstead Not discharging
    Anglian Water · into R Lark · 7.4 km by river above Sicklesmere · 2025: 23 spills, 206 h
  • Great Welnetham Wrc Not discharging
    Anglian Water · into The River Lark Nt · 520 m by river above Sicklesmere · 2025: 1 spill, 0.5 h
Between Fornham St Martin and Temple2 overflows
  • Fornham Wrc Not discharging
    Anglian Water · into River Lark · 11.7 km by river above Temple · 2025: 3 spills, 17 h
  • Pigeon Lane Pumping Station Not discharging
    Anglian Water · into The River Lark · 11.7 km by river above Temple · 2025: 3 spills, 2.5 h
Between Barton Mills Sluice and Isleham1 overflow

Near these gauges, connection not known

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

  • Hawstead Green Pumping Station Not discharging
    Anglian Water · into Stanningf'd Trib Of R Lark · 2.7 km from Sicklesmere in a straight line · no mapped watercourse close enough to be sure · 2025: 6 spills, 36 h
  • Culford The Street Sp Not discharging
    Anglian Water · into Tributary Of The River Lark · 2.9 km from Fornham St Martin in a straight line · its recorded watercourse is not the one mapped beside it · 2025: 7 spills, 30 h
  • The Overflow At PS Not discharging
    Anglian Water · into Trib River Lark · 2.9 km from Fornham St Martin in a straight line · no mapped watercourse close enough to be sure · 2025: 1 spill, 0.3 h

River Lark — East Suffolk

None of the storm overflows FloodRadar holds is traced upstream of Clopton on the river map. That is not the same as none: the map leaves out many small streams and culverts, so an overflow it cannot place may still drain here, and not every company publishes every overflow.

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: © Anglian 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.

River Lark — Cam and Ely Ouse (Including South Level)

17 sampling points on the River Lark and the streams that join it above Isleham, and below it. 12 have a sample from the last 12 months; 14 have any sample banked. Listed from the source down, grouped by the next gauge each one's water reaches.

Above Sicklesmere River Lark 1 point
Sampling pointWatercourse (map)Above the gaugeLast sampleLatest results (river water)
Downstream Larkfield CornerRiver Lark1.4 km8 Sep 2026 · 30 days agoOxygen 43.4% Jun 2026Temp 18.2 °C Jun 2026pH 7.86 Jun 2026Ammonia 0.21 mg/l Jun 2026
Above Fornham St Martin River Lark 6 points, 4 with samples
Sampling pointWatercourse (map)Above the gaugeLast sampleLatest results (river water)
River Lark A134 Sicklesmere Road BridgeRiver Lark8.4 km14 Sep 2026 · 24 days agoOxygen 66.7%Temp 16 °CpH 7.67Ammonia 0.037 mg/l
River Lark Southgate Road Bridge Bury St EdmundsRiver Lark4.8 km9 Sep 2026 · 29 days agoOxygen 91.3% Jul 2026Temp 20.9 °C Jul 2026pH 8 Jul 2026Ammonia 0.14 mg/l Jul 2026
River Linnet Raingate Road Bridge Bury St EdmundsRiver Linnet4.2 km9 Sep 2026 · 29 days agoOxygen 45.4% Jun 2026Temp 14.4 °C Jun 2026pH 7.35 Jun 2026Ammonia 0.24 mg/l Jun 2026
River Lark Tollgate Road BridgeRiver Lark1.3 km7 Sep 2026 · 31 days agoOxygen 87.2%Temp 17.4 °CpH 7.62Ammonia 0.07 mg/l
Tributary of River Lark 1.5 Metres off outlet from Culvert Fornham St MartinRiver Lark0.5 kmLast sampled 2 Nov 2006, before the imported period
Tributary of River Lark Underwood's PaddockRiver Lark0.4 kmLast sampled 2 Nov 2006, before the imported period
Above Temple River Lark 4 points
Sampling pointWatercourse (map)Above the gaugeLast sampleLatest results (river water)
River Lark Fornham All Saints Road BridgeRiver Lark12 km7 Sep 2026 · 31 days agoOxygen 50.7%Temp 16.1 °CpH 7.35Ammonia 1.5 mg/l
River Lark Hengrave Road BridgeRiver Lark9.8 km14 Sep 2026 · 24 days agoOxygen 48.6%Temp 17.5 °CpH 7.41Ammonia 0.071 mg/l
Cavenham Road Bridgeunnamed stream5.4 km9 Sep 2026 · 29 days agoOxygen 97.4% Jun 2026Temp 13.6 °C Jun 2026pH 7.67 Jun 2026Conductivity 714 µS/cm Jun 2026
River Lark Lackford Road BridgeRiver Lark4.2 km9 Sep 2024 · 2.1 years agoOxygen 83.8%Temp 15.2 °CpH 7.8Ammonia 0.044 mg/l
Above Barton Mills Sluice River Lark 3 points
Sampling pointWatercourse (map)Above the gaugeLast sampleLatest results (river water)
River Lark Temple Staunch Road BridgeRiver Lark3.6 km4 Mar 2024 · 2.6 years agoOxygen 99.7%Temp 8 °CpH 7.95Ammonia 0.12 mg/l
Tuddenham Mill Stream Tuddenham MillTuddenham Mill Stream2.8 km9 Sep 2026 · 29 days agoOxygen 66.9%Temp 13.5 °CpH 7.57Ammonia below 0.03 mg/l
Tuddenham Mill Stream Track Tuddenham RoadTuddenham Mill Stream1.8 km7 Nov 2025 · 11 months agoOxygen 75.3%Temp 13 °CpH 7.74Ammonia below 0.03 mg/l
Above Isleham River Lark 1 point
Sampling pointWatercourse (map)Above the gaugeLast sampleLatest results (river water)
River Lark Judes FerryRiver Lark4.1 km28 May 2026 · 4 months agoOxygen 74.1%Temp 17.6 °CpH 7.84Ammonia 0.07 mg/l
Below Isleham 2 points, 1 with samples
Sampling pointWatercourse (map)Below the gaugeLast sampleLatest results (river water)
Lark Isleham MarinaRiver Lark0.2 km3 Dec 2025 · 10 months agoOxygen 77.9%Temp 7.9 °CpH 8Ammonia below 0.03 mg/l
River Lark Prickwillow Road BridgeRiver Lark9.4 kmLast sampled 12 Feb 2019, before the imported period

River Lark — East Suffolk

1 sampling point on the River Lark and the streams that join it above Clopton, and below it. 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.

Below Clopton 1 point
Sampling pointWatercourse (map)Below the gaugeLast sampleLatest results (river water)
River Lark Great Bealings Bridge (River Fynn)River Lark7.9 km1 Sep 2026 · 37 days agoOxygen 77.4%Temp 15.3 °CpH 8.11Ammonia 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.

Wave tracker for this river → Suffolk rivers → All UK rivers