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Does Colnbrook flood?

Slough
21postcodes in the EA rivers-and-sea dataset
12river gauges within 10 km
12years with a recorded flood within 5 km
🏠 Thinking of buying in Colnbrook? Get the detailed Property Flood-Risk Report for any Colnbrook postcode — official risk band, recorded floods since 1946, warning history, river behaviour and nearby storm overflows. £19 one-off, instant. Learn more →

What the Environment Agency's rivers-and-sea flood-risk data says about Colnbrook

Ordnance Survey places 21 postcodes in Colnbrook in the Environment Agency's rivers-and-sea flood-risk dataset (Risk of Flooding from Rivers and Sea). Each postcode is counted once, under the worst band any of its properties reaches; together they hold 214 properties in the EA dataset's likelihood bands.

EA likelihood bandPostcodes (worst band)Properties in the EA datasetof which homes
High115329
Medium2108
Low25957
Very low69287
All bands21214181

This dataset covers flooding from rivers and the sea only — one of five flood sources. Surface water, groundwater, sewers and reservoirs are assessed separately, so a postcode missing from it is not proof that a place cannot flood. The band describes the land around properties (allowing for defences), not any single address and not today's conditions.

Rivers and live river levels near Colnbrook

Environment Agency gauges within 10 km of Colnbrook watch Poyle Channel, Colne Brook, River Colne, River Thames, Frays River, River Ash, River Pinn.

Distances are from the middle of Colnbrook's at-risk postcodes. Tidal and structure gauges are shown as readings only — the tide and sluice gates move them, not floods. A gauge with no recent reading shows no level.

Flood warning areas near Colnbrook

31 Environment Agency flood warning areas lie within 10 km of Colnbrook. The EA has issued 315 flood warnings and alerts for them since 2006, most recently on 14 Mar 2026.

Recorded floods near Colnbrook

Floods whose mapped extent (EA Recorded Flood Outlines) reached within ~5 km of Colnbrook, most recent first. Absence of a record does not mean a place has never flooded. See them on the map →

…and 10 earlier recorded floods on the map.

Rainfall near Colnbrook

The nearest rain gauge, Rainfall station (3.7 km away), recorded 2.6 mm in the last 24 hours and 17.7 mm in the last 7 days (latest reading 47 min ago).

At-risk postcodes in Colnbrook

Every postcode Ordnance Survey places in Colnbrook that appears in the EA's rivers-and-sea dataset, worst band first. Each links to its own flood-risk page.

High likelihood (11)

SL3 0JPSL3 0JUSL3 0JZSL3 0LUSL3 0LXSL3 0NDSL3 0NFSL3 0NGSL3 0NPSL3 0RLSL3 9NT

Medium likelihood (2)

SL3 0HSSL3 0NB

Low likelihood (2)

SL3 0JTSL3 0LN

Very low likelihood (6)

SL3 0AWSL3 0HTSL3 0JESL3 0JFSL3 0JGSL3 0JJ

Postcode districts

SL3 · 21

Sources

FloodRadar summarises public flood data. It is not a flood-risk survey of any property, and it does not replace official GOV.UK flood warnings or the GOV.UK long-term flood risk service.

Flood-risk bands: © Environment Agency copyright and/or database right 2025. All rights reserved. Some features of this map are based on digital spatial data from the Centre for Ecology & Hydrology, © NERC (CEH). © Crown Copyright and Database Rights 2025 OS AC0000807064. This product is produced in part from PAF® and Multiple Residence Data, the copyright in which is owned by Royal Mail Group Limited and/or Royal Mail Group plc. All rights reserved. Licence number AC0000807064.

Recorded Flood Outlines, flood warning areas and warning history © Environment Agency copyright and/or database right 2025. Licensed under the Open Government Licence v3.0.

River levels and rainfall: Environment Agency real-time flood-monitoring data, updated every 15 minutes (Open Government Licence v3.0).

Place names: Contains OS data © Crown copyright and database rights 2026. Contains Royal Mail data © Royal Mail copyright and database right 2026. Contains National Statistics data © Crown copyright and database right 2026. Licensed under the Open Government Licence v3.0.

All data sources & licences