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Does Longrock flood?

Cornwall
28postcodes in the EA rivers-and-sea dataset
5river gauges within 10 km
3tidal gauges within 10 km
24years with a mapped flood record within 5 km
🏠 Thinking of buying in Longrock? Get the detailed Property Flood-Risk Report for any Longrock postcode — official risk band, recorded floods since 1703, warning history, river behaviour and nearby storm overflows. £19 one-off, instant. Learn more →

What the Environment Agency's rivers-and-sea flood-risk data says about Longrock

Ordnance Survey places 28 postcodes in Longrock in the Environment Agency's rivers-and-sea flood-risk dataset (Risk of Flooding from Rivers and Sea). Each postcode is counted once, under the worst band any of its properties reaches; together they hold 282 properties in the EA dataset's likelihood bands.

EA likelihood bandPostcodes (worst band)Properties in the EA datasetof which homes
High164934
Medium65545
Low37246
Very low310641
All bands28282166

This dataset covers flooding from rivers and the sea only — one of five flood sources. Surface water, groundwater, sewers and reservoirs are assessed separately, so a postcode missing from it is not proof that a place cannot flood. The band describes the land around properties (allowing for defences), not any single address and not today's conditions.

Rivers and live river levels near Longrock

Environment Agency gauges within 10 km of Longrock watch Lariggan River, Newlyn Coombe River, River Hayle, River Stennack, North Cornwall Coast.

Distances are from the middle of Longrock's at-risk postcodes. Tidal and structure gauges are shown as readings only — the tide and sluice gates move them, not floods. A gauge with no recent reading shows no level.

The watercourse nearest Longrock

The nearest watercourse on the river map is an unnamed stream, about 670 m from the middle of Longrock's at-risk postcodes.

A gauge downstream shows water that has already passed this point; one upstream sees it first. Distances along the river are from the point on an unnamed stream nearest the middle of Longrock's at-risk postcodes. From Ordnance Survey’s river map (OS Open Rivers), which leaves out small streams, ditches and culverts, so a nearer one may exist. This describes where water goes on the map; it says nothing about flooding at any address. Contains OS data © Crown copyright and database rights 2026.

Flood warning areas near Longrock

10 Environment Agency flood warning areas lie within 10 km of Longrock. The EA has issued 667 flood warnings and alerts for them since 2006, most recently on 30 Sep 2026.

Recorded floods near Longrock

Floods whose mapped extent (EA Recorded Flood Outlines) reached within ~5 km of Longrock, most recent first. Records, not floods: no outline on the record is not evidence a place has not flooded. See them on the map →

…and 54 earlier recorded floods on the map.

Rainfall near Longrock

Longrock gets about 1,197 mm of rain a year on average (wettest month November, 148 mm; driest May, 66 mm). That is close to the UK as a whole, which averages 1,163 mm a year. Source: Met Office HadUK-Grid 1991–2020 (5 km grid), 2.5 km from the place centre.

The nearest rain gauge, Rainfall station (4.8 km away), recorded 0.4 mm in the last 24 hours and 66.4 mm in the last 7 days (latest reading 44 min ago).

At-risk postcodes in Longrock

Every postcode Ordnance Survey places in Longrock that appears in the EA's rivers-and-sea dataset, worst band first. Each links to its own flood-risk page.

High likelihood (16)

TR18 3RFTR20 8ADTR20 8ASTR20 8HWTR20 8HXTR20 8JDTR20 8JETR20 8JFTR20 8JGTR20 8JJTR20 8JRTR20 8JSTR20 8JTTR20 8JUTR20 8LDTR20 9TT

Medium likelihood (6)

TR20 8HTTR20 8HZTR20 8JBTR20 8JQTR20 8JWTR20 8JZ

Low likelihood (3)

TR20 8JATR20 8JPTR20 8JY

Very low likelihood (3)

TR20 8HLTR20 8JLTR20 8JN

Postcode districts

TR18 · 1TR20 · 27

Sources

FloodRadar summarises public flood data. It is not a flood-risk survey of any property, and it does not replace official GOV.UK flood warnings or the GOV.UK long-term flood risk service.

Flood-risk bands: © 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.

Recorded Flood Outlines, flood warning areas and warning history © Environment Agency copyright and/or database right 2025. Licensed under the Open Government Licence v3.0.

River levels and rainfall: Environment Agency real-time flood-monitoring data, updated every 15 minutes (Open Government Licence v3.0).

Average rainfall: HadUK-Grid v1.3.2, Met Office. Contains public sector information licensed under the Open Government Licence v3.0.

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.

All data sources & licences