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⤴Unusual rise — FloodRadar+Top 1% rise rate for this gauge.
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You'll be notified when this gauge is rising more than 0.10 m/hr — a sign of rapidly increasing water levels.
You'll be notified when a new storm-overflow (sewage) discharge starts within ~3 km of this gauge, based on the water companies' near-real-time feeds.
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Not an emergency service — if in danger call 999. Alerts rely on
EA/SEPA/NRW data and are best-efforts. Terms
Current Level
2.122 mASD
▬ Steady
24h Max
2.123 mASD
24h Min
2.112 mASD
Typical Range
1.94 - 2.19
mASD
Highest Recorded
2.72 mASD
EA official record
2.71 in our data (since Mar 1997)
Current level is 78% of this
🚽Sewage overflows nearby
Recent Water Levels
🌍 floodradar.co.uk
1 day
EA forecast (official)
Prediction V2
Prediction Eris
Nimbus beta
Experimental model fusing soil moisture, river flow, groundwater and catchment
character. The shaded band is its 10–90% range, widened so that about 80% of recent outcomes fall inside it.
Under evaluation — not yet promoted, so treat as a second opinion.
Storm overflows whose water reaches this gauge on the mapped river network, nearest first by distance along the river. The status is each water company's monitor: it says whether an overflow is discharging, not how much or what it contains.
5 storm overflows are traced upstream of this gauge, the nearest 5.4 km away along the river. 0 report discharging now, 5 report not discharging.
Anglian Water · into R Lark · 42.0 km upstream along the river
23 spills · 206 hours in 2025
Not discharging now · last
These are the water companies' monitor statuses; a spill does not by itself explain a change in the gauge level. River connections and distances are traced on OS Open Rivers (edition 2026-04), which leaves out many small channels. Explore the sewage map →
In a typical year this gauge reaches its typical high of 2.19 m
on about 12 days.
This year so far: 9 days.
20269 days so far
20255 days
202428 days, 11 of them high · 11 high
202310 days
202211 days
202112 days, 5 of them high · 5 high
202021 days, 2 of them high · 2 high
20192 days
20184 days, 1 of them high · 1 high
20176 days patchy data
Counted from each day's highest reading. Days with missing or implausible readings are left out, so a year marked patchy may have run high more often than shown.
The darker part is days above 2.31 m, the level this gauge tops only a few days a year.
Flood history near this gauge
Official Environment Agency warnings issued since 2012 for the 4 flood
areas linked to this gauge (nearest 8.8 km away).
Warnings apply to a whole flood area, not necessarily this exact spot. Years before 2006 aren't covered by the EA's historic record.
See also the Isleham flood history.
Flood areas linked to this gauge
Flood warnings and alerts are issued for whole areas. These are the 4 areas linked to this gauge, nearest first.
🌊 Groundwater-fedSlow and steady — fed largely by groundwater, so levels change gradually, not in sudden spikes.
Your catchment is all the land that drains rainfall into the river above this gauge. Its character — how
steep, wet, wooded, urban or chalky that land is — decides how fast rain here turns into a rising river. A steep, bare or clay
catchment is “flashy” (rises and falls quickly, floods easily); a flat, chalk or well-wooded one is
slow and steady. The tiles below put numbers to that; the flow-duration curve reads left-to-right
from the river’s typical high flows (Q5) down to its low flows (Q95) — a steep curve means a flashy river.
The physical character of the land that drains to this gauge, and how it shapes its flood response — from the National River Flow Archive (UKCEH).
Baseflow Index
0.78
groundwater-fed — slow & steady
Avg Annual Rainfall
617 mm/yr
1991–2020 · +2% since 1941–70
Urban Extent
2.5%
largely rural
Highest Daily Mean Flow
19.20 m³/s
8 Mar 1952 · daily mean, not the instantaneous peak
Flow-Duration Curve
Daily flow (m³/s) exceeded each % of the time — a steep curve is flashy, a flat one is steady. Q5 high · Q50 median · Q95 low.
Station gauging a navigation lock with Bury St Edmunds and large gw abstractions in the catchment dominated by Chalk geology and arable agriculture.
More detail
The catchment
Chalk, predominantly arable.
The station
Navigation lock with vertical lift gate u/s plus a 16m broad high level weir in bypass channel for flood flows only. Small notch inserted in 1980. 1986 weir was lowered, altered to triangular profile and flows diverted to the bypass channel. The lock is now used during high flows only.
Flow regime
Two large gw abstractions (Bury St Edmunds).
The flow record
Since 1968 major peaks diverted through cutoff channel (10km u/s) - to the Relief Channel at Denver.
How this gauging station is built and how long it has measured (NRFA / UKCEH).
Gauge type
Gauging structure
Operating since
1936–1986
Station datum
2.4 mAOD
Flow record
1936–1986 · 50 yrs · 98% complete
Hydrometric area
33
Measured by
Environment Agency
Nearby Groundwater
Soil Moisture
Possible storm-overflow correlation
Frequently asked questions
Is the River Lark at Isleham flooding today?
The current level is 2.12m, which is within the typical range of 1.94 to 2.19m. Flooding is unlikely at this level.
Is the river level rising or falling at Isleham?
Based on the most recent readings, the level is currently steady. The chart above shows the last 12 hours of measurements by default (up to 7 days), updated roughly every 15 minutes.
What is a normal level for the River Lark at Isleham?
The typical range at this station is 1.94m to 2.19m, based on Environment Agency historical data. Levels above 2.19m are higher than usually seen and may indicate a flood risk.
How often is this river level data updated?
Readings are supplied by the Environment Agency gauge. FloodRadar checks for updates roughly every 15 minutes; the timestamp above shows how recent the latest available reading is.
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📮 Flood risk by postcode near this gauge
Postcodes within 5 km with properties in the Environment Agency’s rivers-and-sea flood-risk bands: