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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
6.758 mASD
▬ Steady
24h Max
6.759 mASD
24h Min
6.751 mASD
Typical Range
6.49 - 7.80
mASD
Highest Recorded
9.33 mASD
EA official record
9.92 in our data (since Feb 1995)
Current level is 72% 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 6 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.
8 storm overflows are traced upstream of this gauge, the nearest 850 m away along the river. 0 report discharging now, 8 report not discharging.
Thames Water · into Otmoor Lane Ditch · 4.7 km away in a straight line · no mapped watercourse close enough to be sure
4 spills · 24 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 7.80 m
on about 47 days.
This year so far: 51 days.
202651 days, 1 of them high · 1 highso far
202529 days, 1 of them high · 1 high
2024112 days, 24 of them high · 24 high
202374 days, 1 of them high · 1 high
202227 days, 5 of them high · 5 high
202143 days, 6 of them high · 6 high
202067 days, 8 of them high · 8 high
201949 days, 12 of them high · 12 high
201819 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 8.72 m, the level this gauge tops only a few days a year.
Flood history near this gauge
Official Environment Agency warnings issued since 2011 for the 10 flood
areas linked to this gauge (nearest 0.8 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 islip flood history.
Flood areas linked to this gauge
Flood warnings and alerts are issued for whole areas. These are the 10 areas linked to this gauge, nearest first.
🌊 Fairly flashyResponds fairly quickly to rain, with moderate baseflow between events.
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
0.49
mixed response
Avg Annual Rainfall
669 mm/yr
1991–2020 · +2% since 1941–70
Urban Extent
2.1%
largely rural
Highest Daily Mean Flow
21.40 m³/s
5 Jan 2024 · 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.
Land Cover (2023)
Woodland 7%Grassland 55%Arable 30%Urban 8%
Arable 40% → 30% since 1990
About this gauge
Ultrasonic gauging station located in the lower reaches of the River Ray just above the confluence of the River Cherwell.
More detail
The catchment
Relatively flat impermeable (Oxford Clay) catchment given over largely to agriculture (but includes Bicester). The station is just below Otmoor.
The station
Multi-path cross-configuration US (in two-channel section).
How it measures flow
Good hydrometric performance but very low velocities in low flow conditions.
Flow regime
Only minor disturbances to the natural (and responsive) flow regime.
How this gauging station is built and how long it has measured (NRFA / UKCEH).
Gauge type
Ultrasonic
Operating since
1994
Station datum
50.0 mAOD
Flow record
1995–2024 · 29 yrs · 98% complete
Hydrometric area
39
Measured by
Environment Agency
Nearby Groundwater
Soil Moisture
Possible storm-overflow correlation
Frequently asked questions
Is the River Ray at Islip flooding today?
The current level is 6.76m, which is within the typical range of 6.49 to 7.80m. Flooding is unlikely at this level.
Is the river level rising or falling at Islip?
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 Ray at Islip?
The typical range at this station is 6.49m to 7.80m, based on Environment Agency historical data. Levels above 7.80m 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:
FloodRadar
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