The official "typical high" for this gauge is routinely exceeded (often the case on
regulated rivers), so FloodRadar uses a threshold computed from this station's own data.
(1h ago) • 4 readings/hr • 169 views
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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
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Current Level
0.122 mASD
▬ Steady
24h Max
0.156 mASD
24h Min
0.117 mASD
Typical Range
0.19 - 0.77
mASD
Highest Recorded
1.12 mASD
EA official record
A 2.22 reading (21 Oct 2022) sits in our unverified raw history and is not treated as the record
Current level is 11% 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.
51 storm overflows are traced upstream of this gauge, the nearest 1.9 km away along the river. 0 report discharging now, 45 report not discharging, and for 6 the monitor is offline or has not reported, so their status is not known.
Anglian Water · into Lavendon Brook River Great Ous · 54.5 km upstream along the river
37 spills · 142 hours in 2025
Not discharging now · last
Placed on the river by its position alone.
43 more further upstream, up to 123.2 km away along the river.
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 →
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 Bedford flood history.
Flood areas linked to this gauge
Flood warnings and alerts are issued for whole areas. These are the 14 areas linked to this gauge, nearest first.
Is the River Great Ouse at Castle Mill flooding today?
The current level is 0.12m, which is below the typical range. Flooding is very unlikely at this level.
Is the river level rising or falling at Castle Mill?
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 Great Ouse at Castle Mill?
The typical range at this station is 0.19m to 0.77m, based on Environment Agency historical data. Levels above 0.77m 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:
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