Does M3 flood?

Yes — parts of the M3 district carry real flood risk: 11 of its 177 at-risk postcodes reach the Environment Agency's High likelihood band. The M3 postcode district covers Blackfriars & Trinity, Deansgate, Cheetham, Broughton, close to Salford, Manchester, Ancouts, and surrounding villages in Greater Manchester.

177 postcodes in the M3 district appear in the Environment Agency's rivers-and-sea flood-risk dataset — worst bands: 11 high, 2 medium, 158 low, 6 very low. A postcode not listed here has no properties in any recorded risk band (which is good news, but never proof it cannot flood).

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Which M3 postcodes are at risk?

M3 1AA up to High M3 1NG up to High M3 1NJ up to High M3 1NL up to High M3 1NQ up to High M3 2JA up to High M3 2WJ up to High M3 4LA up to High M3 4LB up to High M3 5AS up to High M3 5EJ up to High M3 4BD up to Medium M3 4JQ up to Medium M3 1DA up to Low M3 1DQ up to Low M3 1DX up to Low M3 1DY up to Low M3 1DZ up to Low M3 1EE up to Low M3 1EF up to Low M3 1EG up to Low M3 1FB up to Low M3 1FE up to Low M3 1FF up to Low M3 1LN up to Low M3 1LT up to Low M3 1LU up to Low M3 1ND up to Low M3 1NF up to Low M3 1NH up to Low M3 1NN up to Low M3 1NP up to Low M3 1PH up to Low M3 1PJ up to Low M3 1PQ up to Low M3 1PT up to Low M3 1RH up to Low M3 1RR up to Low M3 1SB up to Low M3 1UN up to Low M3 2EQ up to Low M3 4AR up to Low M3 4BB up to Low M3 4BH up to Low M3 4BR up to Low M3 4JA up to Low M3 4JE up to Low M3 4JL up to Low M3 4LG up to Low M3 4NB up to Low M3 5AG up to Low M3 5AL up to Low M3 5AP up to Low M3 5BJ up to Low M3 5BN up to Low M3 5BQ up to Low M3 5BY up to Low M3 5BZ up to Low M3 5DE up to Low M3 5DF up to Low M3 5DG up to Low M3 5DW up to Low M3 5DX up to Low M3 5DY up to Low M3 5DZ up to Low M3 5ED up to Low M3 5EH up to Low M3 5EU up to Low M3 5EW up to Low M3 5EY up to Low M3 5EZ up to Low M3 5FA up to Low M3 5FB up to Low M3 5FE up to Low M3 5FF up to Low M3 5FG up to Low M3 5FH up to Low M3 5FL up to Low M3 5FN up to Low M3 5FS up to Low M3 5FW up to Low M3 5FZ up to Low M3 5GD up to Low M3 5GE up to Low M3 5GF up to Low M3 5GP up to Low M3 5JR up to Low M3 5JS up to Low M3 5LH up to Low M3 5NA up to Low M3 5NB up to Low M3 5ND up to Low M3 5NE up to Low M3 5NF up to Low M3 5NG up to Low M3 6AB up to Low M3 6AG up to Low M3 6AH up to Low M3 6AL up to Low M3 6AP up to Low M3 6AQ up to Low M3 6AR up to Low M3 6AS up to Low M3 6DN up to Low M3 6DZ up to Low M3 6EE up to Low M3 6EG up to Low M3 6FD up to Low M3 6FE up to Low M3 6FY up to Low M3 6GH up to Low M3 6HT up to Low M3 6HU up to Low M3 6JG up to Low M3 6JH up to Low M3 6JN up to Low M3 6LZ up to Low M3 6NB up to Low M3 6WA up to Low M3 6WB up to Low M3 7AA up to Low M3 7AD up to Low M3 7AF up to Low M3 7AL up to Low M3 7AR up to Low M3 7AS up to Low M3 7BA up to Low M3 7BX up to Low M3 7EH up to Low M3 7ER up to Low M3 7ES up to Low M3 7EU up to Low M3 7FA up to Low M3 7FB up to Low M3 7FD up to Low M3 7FE up to Low M3 7FF up to Low M3 7FG up to Low M3 7FH up to Low M3 7FQ up to Low M3 7FR up to Low M3 7FS up to Low M3 7FU up to Low M3 7GE up to Low M3 7GF up to Low M3 7GG up to Low M3 7GH up to Low M3 7GJ up to Low M3 7GL up to Low M3 7GN up to Low M3 7GP up to Low M3 7GT up to Low M3 7GU up to Low M3 7JQ up to Low M3 7JS up to Low M3 7JY up to Low M3 7JZ up to Low M3 7LB up to Low M3 7LD up to Low M3 7LE up to Low M3 7LF up to Low M3 7LJ up to Low M3 7LW up to Low M3 7NG up to Low M3 7NH up to Low M3 7NJ up to Low M3 7NW up to Low M3 7NY up to Low M3 7RB up to Low M3 7SW up to Low M3 7WJ up to Low M3 1LS up to Very low M3 7BJ up to Very low M3 7BL up to Very low M3 7BW up to Very low M3 7GS up to Very low M3 7WX up to Very low

Rivers and flooding history near M3

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

Manchester Racecourse on the River Irwell — 2 km away, highest on record 5.67m
London Road on the River Medlock — 2 km away, highest on record 1.80m
Littleton Road River on the River Irwell — 3.6 km away, highest on record 4.98m
Chestnut Road on the Worsley Brook — 8.2 km away, highest on record 2.14m

307 official flood warnings and alerts have been raised within ~10 km of the district's centre since 2006 (113 at warning level or above), most recently 21 February 2026. Warnings cover flood areas, not individual addresses.

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

Manchester Manchester - NYE/NYD 25 (2025) — about 1.6 km from the centre
Manchester Harpurhey - NYE/NYD 25 (2025) — about 1.6 km from the centre
Manchester Castlefields - NYE/NYD 25 (2025) — about 1.1 km from the centre
Collyhurst Road, (2019) — about 1.7 km from the centre

Records, not floods: no outline on the record is not evidence a place has not flooded.

🏠 Buying or renting in M3? 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

M4 M1 M5 M6 M7 M8 M9 M11

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.