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Blackburn, Lancashire
Up to Medium likelihood
Properties in BB1 9AT sit in the Environment Agency's Medium flood-likelihood band (worst property). The band is the worst found in the postcode — it describes the land around properties (defence-adjusted, rivers & sea), not any single address, and not today's conditions.
| Likelihood band | Annual chance | Properties | Of which homes |
|---|---|---|---|
| High | greater than 3.3% | 0 | 0 |
| Medium | 1% – 3.3% | 4 | 4 |
| Low | 0.1% – 1% | 0 | 0 |
| Very low | below 0.1% | 0 | 0 |
Over a 25-year mortgage, a property in a medium-likelihood area has a 22–57% chance of flooding at least once.
The ground here sits at about 125 m above sea level and falls 81 m across the surrounding 800 m. Surface water reaching this point runs off ground lying to the east-north-east, 70.6 m higher.
Because properties in the medium likelihood band; 1 recorded flood nearby; 145 official warnings since 2006.
The map above shows the real EA rivers & sea likelihood cells around BB1 9AT. The small panels are illustrative previews of the report's per-layer map views — the full report draws each layer for real, plus recorded extents, defences and a building picker on an interactive map.
Warnings cover flood areas, not individual addresses.
| Date | Recorded flood | Approx. distance |
|---|---|---|
| Dec 2015 | Whalley New Road, Blackburn | ~0.5 km |
EA Recorded Flood Outlines — absence of a record never proves a place has not flooded. The full report tests whether any extent covered the exact spot.
Ciara (2020, 8 warnings nearby) · Desmond (2015, 6 warnings nearby) · Bert (2024, 5 warnings nearby) · Aiden (2020, 3 warnings nearby)
| Gauge | River | Distance | Typical high | Highest on record |
|---|---|---|---|---|
| Gorse Street | River Blakewater | 3.6 km | 1.00 m | 1.32 m |
| Harrison Street | River Blakewater | 4.4 km | 2.57 m | 2.82 m |
| Ribchester School | River Ribble | 4.7 km | 4.41 m | 6.02 m |
| Ribchester Sarmatian Bridge | Boyces Brook | 5.2 km | 1.00 m | 1.42 m |
Live levels, predictions and rain-response behaviour are on each gauge's page and in the property report.
| Overflow | Discharges into | Distance | Spills | Hours |
|---|---|---|---|---|
| Wilpshire Wwtw (wilps) | Showley Brook | 1.2 km | 92 (2024) | 475 |
| Ramsgreave Drive Cso | Tributary Of River Blakewater | 1.3 km | 1 (2024) | 0 |
| West Of Dewhurst Farm Cso 341rs | Trib Of Dinckley Brook | 2.0 km | 67 (2024) | 92 |
| Brownhill Drive Cso | Trib Of River Blakewater | 2.2 km | 1 (2024) | 0 |
Official annual EDM figures — a water-quality signal for local watercourses, not a property flood-risk factor.
No mapped flood-defence assets within 500 m of the postcode centre. Defences reduce risk, never remove it.
The interactive flood-risk map with a building picker (your exact house, not the postcode), the 2050s climate view, surface-water and planning flood zones at your building, exact recorded-flood distances, year-by-year warning charts, watercourses including culverted streams, an insurance outlook with the Flood Re rules, and a printable document with every dataset receipt — start with the free preview, unlock for £19.
At-risk postcodes near BB1 9AT — all in the BB1 district.
© 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. 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. Recorded Flood Outlines and warning history © Environment Agency copyright and/or database right 2025. Storm-overflow figures: EA Event Duration Monitoring. Flood defences © Environment Agency (OGL v3). This page summarises public area-level data — it is not a flood-risk survey and not a substitute for the official GOV.UK service. All data sources & licences. More postcodes: the BB1 district.