Thames from Hurley to Teddington catchment
• Datchet • Windsor and Maidenhead • ID: 2700TH • Level
(27m ago) • 4 readings/hr • 220 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
EA/SEPA/NRW data and are best-efforts. Terms
Current Level
3.308 mASD
▼ Easing
24h Max
3.330 mASD
24h Min
3.296 mASD
Typical Range
3.22 - 4.25
mASD
Highest Recorded
5.72 mASD
EA official record
A 7.34 reading (12 Dec 1992) sits in our unverified raw history and is not treated as the record
Current level is 58% of this
Current Flow
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🚽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 9 Oct (2 days behind — the EA publishes each day's mean a day or two after it ends; unchecked, provisional)via EA Hydrology
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.
111 storm overflows are traced upstream of this gauge, the nearest 6.0 km away along the river. 0 report discharging now, 108 report not discharging, and for 3 the monitor is offline or has not reported, so their status is not known.
Thames Water · into Thames · 38.1 km upstream along the river
4 spills · 10 hours in 2025
Not discharging now · last
103 more further upstream, up to 200.7 km away along the river.
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 4.25 m
on about 9 days.
This year so far: 16 days.
202616 days so far
20252 days
202440 days
20236 days
20220 days
202113 days
202014 days
20196 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 6.29 m, the level this gauge tops only a few days a year.
Flood history near this gauge
Official Environment Agency warnings issued since 2009 for the 15 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 Datchet flood history.
Flood areas linked to this gauge
Flood warnings and alerts are issued for whole areas. These are the 15 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
0.66
groundwater-fed — slow & steady
Avg Annual Rainfall
746 mm/yr
1991–2020 · +4% since 1941–70
Urban Extent
4.6%
partly urbanised
Highest Daily Mean Flow
391 m³/s
5 Jan 2003 · 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.
Multi-path ultrasonic gauging station based in the lower River Thames catchment.
More detail
The catchment
Scarp and vale topography developed on diverse geology. Predominantly rural headwaters contrast with considerable suburban growth in the lower valley. Representative of large lowland catchments in England.
The station
Multi-path US superseded, in 1988, original single-path configuration (installed 1978).
How it measures flow
Post-1992 gaps filled by using equi-percentile flows with Reading (39130) as a surrogate, earlier gaps filled using Kingston (39001) naturalised flows as a surrogate. Calibration confirmed by gaugings.
Flow regime
Baseflow from the Chalk and Oolitic L'st, quicker response from the Oxford Clay and Lower London Tertiaries. Station is u/s of the major PWS off-takes for London.
The flow record
All but exceptional floods contained. 01/2003 peak: c405 cumecs.
How this gauging station is built and how long it has measured (NRFA / UKCEH).
Gauge type
Ultrasonic
Operating since
1979
Station datum
13.5 mAOD
Flow record
1979–2024 · 45 yrs · 100% complete
Hydrometric area
39
Measured by
Environment Agency
Nearby Groundwater
Soil Moisture
Possible storm-overflow correlation
Frequently asked questions
Is the River Thames at Windsor Park flooding today?
The current level is 3.31m, which is within the typical range of 3.22 to 4.25m. Flooding is unlikely at this level.
Is the river level rising or falling at Windsor Park?
Based on the most recent readings, the level is currently falling slightly. The chart above shows the last 12 hours of measurements by default (up to 7 days), updated roughly every 15 minutes.
Why is the level slowly falling?
When little or no rain has fallen for a while, a river level gradually drops as the water stored in the ground and soil drains away with nothing to replace it. This is called baseflow recession and is normal in dry spells. A gentle decline like this is expected and is not a sign of a problem — downstream gauges often recede a little faster than headwaters further upstream, and levels recover once rain returns.
What is a normal level for the River Thames at Windsor Park?
The typical range at this station is 3.22m to 4.25m, based on Environment Agency historical data. Levels above 4.25m 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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