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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
0.048 mASD
▬ Steady
24h Max
0.048 mASD
24h Min
0.045 mASD
Typical Range
0.04 - 0.20
mASD
Highest Recorded
0.55 mASD
EA official record
0.55 in our data (since Nov 1986)
Current level is 9% 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.
River Flow
90 days
Daily mean discharge (m³/s) with the daily min–max band, from the EA Hydrology API. Flow is the volume of water passing the gauge — often a more direct flood signal than level.
Flow Data: Daily mean flow (m³/s) to 6 Oct (2 days behind — the EA publishes each day's mean a day or two after it ends; unchecked, provisional)via EA Hydrology
None of the storm overflows FloodRadar holds is traced upstream of this gauge on the mapped river network. 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. Those nearby are listed below.
Nearby, connection not known
Within 6 km in a straight line, but the river map cannot say whether their water passes this gauge.
Thames Water · into Hamstead Stream · 5.5 km away in a straight line · its watercourse is not on the river map
42 spills · 565 hours in 2025
Not discharging now · last
1 other overflow within 6 km is downstream of this gauge or on another branch of the river network, so it is not listed.
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 0.20 m
on about 28 days.
This year so far: 12 days.
202612 days so far
202566 days, 1 of them high · 1 high
2024137 days, 35 of them high · 35 high
20230 days
20220 days
20210 days
202052 days
20190 days
20180 days
20170 days
Counted from each day's highest reading. Days with missing or implausible readings are left out.
The darker part is days above 0.27 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 6 flood
areas linked to this gauge (nearest 0.6 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 Bagnor flood history.
Flood areas linked to this gauge
Flood warnings and alerts are issued for whole areas. These are the 6 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
0.77
groundwater-fed — slow & steady
Avg Annual Rainfall
770 mm/yr
1991–2020 · +8% since 1941–70
Urban Extent
0.1%
largely rural
Median Annual Flood
0.401 m³/s
QMED — typical yearly peak flow
Highest Daily Mean Flow
1.42 m³/s
20 Jul 2007 · 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.
The station is located in the lower reaches of the Winterbourne Stream, close to the confluence of the River Lambourn.
More detail
The catchment
A Chalk catchment (with extensive Clay-with-Flints cover). It is very rural in character.
The station
Crump weir, 3m wide, but was originally 5.5m wide and was reduced to improve sensitivity in 1968. Prone to siltation upstream of weir.
How it measures flow
Full range. Resurveyed in 1997 and a new datum was recorded. Non-modular flow conditions can occur when stage is in excess of 0.25m. Protected flows derived from standard Crump weir calculation.
Flow regime
Stable, spring-fed regime. Runoff reduced by gw abstractions (e.g. WBGS) during the POR.
The flow record
2017/2018 AMAX accounts for West Berks Groundwater Scheme pump test in May 2018. 2018/2019 AMAX not affected by WBGS. Full period of record peak flow data reviewed and released in September 2020 (WINFAP Files v9).
How this gauging station is built and how long it has measured (NRFA / UKCEH).
Gauge type
Crump weir
Operating since
1962
Station datum
80.5 mAOD
Flow record
1962–2024 · 62 yrs · 100% complete
Peak-flow record
since 1962
Hydrometric area
39
Measured by
Environment Agency
Nearby Groundwater
Soil Moisture
Possible storm-overflow correlation
Frequently asked questions
Is the Winterbourne Stream at Bagnor flooding today?
The current level is 0.05m, which is within the typical range of 0.04 to 0.20m. Flooding is unlikely at this level.
Is the river level rising or falling at Bagnor?
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 Winterbourne Stream at Bagnor?
The typical range at this station is 0.04m to 0.20m, based on Environment Agency historical data. Levels above 0.20m 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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Free live river-level widget — ideal for parish councils, angling clubs and local sites. Updates automatically.
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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: