Does DN12 flood?

Yes — parts of the DN12 district carry real flood risk: 7 of its 27 at-risk postcodes reach the Environment Agency's High likelihood band. The DN12 postcode district covers Conisbrough, close to Mexborough, Dearne Washlands, Sprotbrough, and surrounding villages in parts of South Yorkshire and Nottinghamshire.

27 postcodes in the DN12 district appear in the Environment Agency's rivers-and-sea flood-risk dataset — worst bands: 7 high, 6 medium, 13 low, 1 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).

Free preview first · full report £19

Which DN12 postcodes are at risk?

Rivers and flooding history near DN12

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

Conisbrough on the Kearsley Brook — 0.6 km away, highest on record 1.31m
Sprotbrough on the River Don — 3.8 km away, highest on record 4.72m
Adwick on the River Dearne — 4.5 km away, highest on record 2.77m
Bolton Bridge on the River Dearne — 6.2 km away, highest on record 3.54m

77 official flood warnings and alerts have been raised within ~10 km of the district's centre since 2006 (43 at warning level or above), most recently 30 August 2026. Warnings cover flood areas, not individual addresses.

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

2022 February Flood Incident -Storm Dudley, Eunice and Franklin (2022) — about 9.8 km from the centre
2021 January Flood Incident - Storm Christoph (2021) — about 41.5 km from the centre
2020 February Flood Incident - Storm Dennis (2020) — about 35.4 km from the centre

🏠 Buying or renting in DN12? 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

DN11 DN10 DN14 DN15 DN9 DN16 DN8 DN17

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.