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0.05

Bagnor

Winterbourne Stream
Vale of White Horse catchment • Bagnor • West Berkshire • ID: 2264TH • Level
(21m ago) • 4 readings/hr • 181 views

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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

Recent Readings

Steady over 5h
08 Oct 16:45 ▬ steady 0.048 mASD
08 Oct 16:30 ▲ +0.2 cm 0.048 mASD
08 Oct 16:15 ▬ steady 0.046 mASD
08 Oct 16:00 ▲ +0.1 cm 0.046 mASD
08 Oct 15:45 ▼ -0.1 cm 0.045 mASD
08 Oct 15:30 ▲ +0.1 cm 0.046 mASD
08 Oct 15:15 ▬ steady 0.045 mASD
08 Oct 15:00 ▼ -0.1 cm 0.045 mASD
08 Oct 14:45 ▲ +0.1 cm 0.046 mASD
08 Oct 14:30 ▬ steady 0.045 mASD
08 Oct 14:15 ▼ -0.1 cm 0.045 mASD
08 Oct 14:00 ▬ steady 0.046 mASD
08 Oct 13:45 ▬ steady 0.046 mASD
08 Oct 13:30 ▬ steady 0.046 mASD
08 Oct 13:15 ▬ steady 0.046 mASD
08 Oct 13:00 ▼ -0.1 cm 0.046 mASD
08 Oct 12:45 ▲ +0.1 cm 0.047 mASD
08 Oct 12:15 ▬ steady 0.046 mASD
08 Oct 12:00 ▼ -0.1 cm 0.046 mASD
08 Oct 11:45 0.047 mASD

Station Details

Technical details: references, datum, range, flow archive
  • Station Reference: 2264TH
  • RLOI id: 7125 (the EA's check-for-flooding station id)
  • EA Gauge ID: 2264TH-level-stage-i-15_min-mASD
  • Parameter: Level
  • Unit: mASD
  • Typical rise rate: 1 cm/hr (p95 sustained over 90 days)
  • Typical data delay: ~22 min (measured reading→publication lag)
  • Tidal: No
  • Lock / structure: No
  • Catchment Area: Vale of White Horse
  • Typical Range: 0.041 – 0.200 mASD
  • Drainage Area: 49 km² upstream of this gauge
  • 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
  • EA Cross-check: 0.05 mASD (EA at 8 Oct 16:15)
  • Flow Archive: National River Flow Archive ↗

Geographic coordinates may reflect the access point for the gauge, and not the precise location in the watercourse that it is taking readings from.

Nearby Stations

Gauges connected to this river, and others nearby. A distance “by river” follows the river on the map; any other is in a straight line.

Connected downstream

Same river system, separate branch

Distances by river: OS Open Rivers. Contains OS data © Crown copyright and database rights 2026.

💧 Storm overflows upstream of this gauge

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 Winterbourne Stream · 2.6 km away in a straight line · its watercourse is not on the river map
116 spills · 2,635 hours in 2025
Not discharging now · last
💧
Thames Water · into Winterbourne Stream · 4.7 km away in a straight line · its watercourse is not on the river map
0 spills · 0 hours in 2025
Not discharging now · last
💧
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 →

Contains OS data © Crown copyright and database rights 2026.

Rainfall & Weather

Loading rainfall and weather data...

How often this river runs high

In a typical year this gauge reaches its typical high of 0.20 m on about 28 days. This year so far: 12 days.

2026 12 days so far
2025 66 days, 1 of them high · 1 high
2024 137 days, 35 of them high · 35 high
2023 0 days
2022 0 days
2021 0 days
2020 52 days
2019 0 days
2018 0 days
2017 0 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).

18flood warnings 66flood alerts

Most recent flood warning: 28 Mar 2024 — River Lambourn from Donnington to Newbury

Year by year
YearWarningsAlerts
2026 0 46
2025 0 3
2024 8 6
2023 1 0
2020 3 3
2019 1 1
2018 0 2
2016 0 1
2014 3 1
2013 1 2
2012 1 1

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.

Catchment Character

🌊 Groundwater-fed Slow 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
mean 0.1810.4320.1370.0525% (high)% of days exceeded95% (low)
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.
Land Cover (2023)
Woodland 9%Grassland 21%Arable 68%Heath/scrub 1%Urban 2%
Arable 73% → 68% since 1990

Flow affected by: reservoir influence, groundwater abstraction.

Photos

Gauging-station photographs from the National River Flow Archive (UKCEH).

Photos © NRFA / UKCEH & the measuring authority — shown at web resolution. Full gallery on the NRFA ↗

About this gauge

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).

Descriptions from the National River Flow Archive (UKCEH). NRFA station record ↗

Gauge Details

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

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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📮 Flood risk by postcode near this gauge

Postcodes within 5 km with properties in the Environment Agency’s rivers-and-sea flood-risk bands:

Check any UK postcode’s flood risk →

🏠 Buying or renting around here? Get the Property Flood-Risk Report for any English postcode — official risk band, recorded floods, warning history, river behaviour and nearby storm overflows. £19 one-off. Learn more →