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Does DN21 1DG flood?

Gainsborough, Lincolnshire

Up to Low likelihood

Properties in DN21 1DG sit in the Environment Agency's Low 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 bandAnnual chancePropertiesOf which homes
Highgreater than 3.3%00
Medium1% – 3.3%00
Low0.1% – 1%2020
Very lowbelow 0.1%00

Over a 25-year mortgage, a property in a low-likelihood area has a 2–22% chance of flooding at least once.

The ground around DN21 1DG

The ground here sits at about 6 m above sea level and falls 34 m across the surrounding 800 m. Surface water reaching this point runs off ground lying to the north-east, 29.8 m higher.

Shaded relief map of the ground around DN211DG, computed from Environment Agency LiDAR. The ground here sits at about 6 m above sea level and falls 34 m across the surrounding 800 m. Surface water reaching this point runs off ground lying to the north-east, 29.8 m higher.
Shaded relief of the bare ground within about 400 m of DN21 1DG, computed from the Environment Agency's published LiDAR terrain survey. The ring marks the postcode centre, not a property. This shows the shape of the land, not a flood map — it does not include drains, culverts, walls or kerbs, and the official likelihood band above is the authoritative figure. © Environment Agency copyright and/or database right 2022. All rights reserved.
Instant access · no account needed · 14-day money-back guarantee or see the free preview first
Get the full flood report for DN21 1DG — £19 Free preview first · instant access · no account needed The detail below — flood history, warnings, rivers, overflows — is part of FloodRadar's property flood-risk report. The official band above is free; the preview shows more before you decide.

Inside the full report for DN21 1DG

FloodRadarProperty Flood-Risk Report
DN21 1DG
Moderate flood risk — investigate further

Because properties in the low likelihood band; 6 recorded floods nearby; 4 official warnings since 2006.

C Today — indicative grade (A best → E)
··· By the 2050s — EA climate scenario (in the full report)
⚑ Official warning within 10 km: Yes ⚑ Recorded flood nearby: Yes ⚑ Flood defences within 500 m: Yes ⚑ In flood zone 2 or 3: ···
Rivers & sea
Up to Low
Surface water
···
Groundwater
Not assessed
Historic flooding
Recorded nearby
Warning history · flood map with building picker · 2050s view · insurance outlook · every dataset receipt — 18 sections

Flood-risk map of this area

Environment Agency flood-likelihood cells
High (>3.3%/yr) Medium Low Very low Marker = postcode centre Base map © OpenStreetMap contributors

The map above shows the real EA rivers & sea likelihood cells around DN21 1DG. 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.

Official flood warnings near DN21 1DG

4
flood alerts & warnings within 10 km since 2016
4
of them full flood warnings or severe warnings
2024
most recent warning nearby (2024-01-06)

Warnings cover flood areas, not individual addresses.

Recorded floods near this postcode

DateRecorded floodApprox. distance
Jan 2024 Torksey to Lea January 2024 ~5.4 km
Jan 2024 Beckingham January 2024 ~3.0 km
Jan 2021 2021 January Flood Incident - Storm Christoph ~58.2 km
Feb 2020 2020 February Flood Incident - Storm Dennis ~43.2 km
Feb 2020 2020 February Flood Incident - Storm Ciara ~45.1 km
Nov 2019 2019 November Flood Incident ~35.5 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.

The rivers that matter for DN21 1DG

GaugeRiverDistanceTypical highHighest on record
Squires Bridge River Till 10.7 km 2.87 m 4.34 m
Torksey River Trent 10.7 km 4.65 m 7.42 m
Mattersey River Idle 12.9 km 2.70 m 2.81 m
Scotter River Eau 14.1 km 1.75 m 2.82 m

Live levels, predictions and rain-response behaviour are on each gauge's page and in the property report.

Storm overflows within 5 km

OverflowDischarges intoDistanceSpillsHours
Bridge Street Pumping Station Sso River Trent 0.6 km 67 (2024) 295
Gainsborough Stw River Trent 1.3 km 8 (2024) 45
North Warren Road Pumping Station River Trent 2.4 km 65 (2024) 249
Tetheringrass Lane Pumping Station Tetheringrass Drain 4.3 km 20 (2024) 133

Official annual EDM figures — a water-quality signal for local watercourses, not a property flood-risk factor.

Flood defences

12 mapped flood-defence assets within 500 m — nearest ~373 m (embankment, wall, bridge abutment). Defences reduce risk, never remove it.

What the full property report adds

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.

Flood risk at nearby postcodes

DN21 1AA up to Low DN21 1AB up to Low DN21 1AD up to Low DN21 1AF up to Low DN21 1AH up to Low DN21 1AJ up to Low DN21 1AL up to Low DN21 1AN up to Low DN21 1AP up to Low DN21 1AQ up to Low DN21 1AY up to High DN21 1BA up to Low

At-risk postcodes near DN21 1DG — all in the DN21 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 DN21 district.