Does N11 flood?

Yes — parts of the N11 district carry real flood risk: 2 of its 26 at-risk postcodes reach the Environment Agency's High likelihood band. The N11 postcode district covers New Southgate, Friern Barnet, Arnos Grove, Brunswick Park, close to Southgate, Totteridge, Winchmore Hill, and surrounding villages in parts of England and Hertfordshire.

26 postcodes in the N11 district appear in the Environment Agency's rivers-and-sea flood-risk dataset — worst bands: 2 high, 3 medium, 21 low. A postcode not listed here has no properties in any recorded risk band (which is good news, but never proof it cannot flood).

Free preview first · full report £19

Which N11 postcodes are at risk?

N11 1FJ up to High N11 1QJ up to High N11 1AR up to Medium N11 1BA up to Medium N11 1FH up to Medium N11 1AP up to Low N11 1AS up to Low N11 1AT up to Low N11 1AU up to Low N11 1AX up to Low N11 1BD up to Low N11 1BT up to Low N11 1DA up to Low N11 1DB up to Low N11 1DD up to Low N11 1QD up to Low N11 2RE up to Low N11 2RG up to Low N11 2RT up to Low N11 2UU up to Low N11 3NN up to Low N11 3NR up to Low N11 3NS up to Low N11 3NW up to Low N11 3PA up to Low N11 3UT up to Low

Rivers and flooding history near N11

The rivers that matter here, each monitored live on FloodRadar:

Powys Lane on the Pymmes Brook — 1 km away, highest on record 2.05m
Whetstone on the Dollis Brook — 3.5 km away, highest on record 1.07m
North Finchley on the Dollis Brook — 3.6 km away, highest on record 2.06m
Enfield, The Chine on the Salmon Brook — 4.4 km away, highest on record 2.42m

231 official flood warnings and alerts have been raised within ~10 km of the district's centre since 2006 (7 at warning level or above), most recently 27 August 2026. Warnings cover flood areas, not individual addresses.

Recorded flood extents near the district (Environment Agency record):

September 1992 flooding — about 12.4 km from the centre
October 1987 flooding — about 4.6 km from the centre
06JulySumer1964 (1964) — about 3.6 km from the centre
July 1964 flooding — about 3.4 km from the centre

🏠 Buying or renting in N11? The full property flood-risk report covers any postcode here — the official likelihood band, every recorded flood nearby with distances, warning history year by year, how the local rivers behave, and an insurance outlook, print-ready for £19. See what's in the report →

Flood risk in nearby postcode districts

N10 N12 N13 N9 N14 N15 N16 N17

Band = the worst likelihood band of any property in that postcode (EA Risk of Flooding from Rivers & Sea, defence-adjusted, area-level). Check any postcode in detail — or get the full £19 property report — at the property flood-risk report. © 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.