Boscastle Flood 2004: What Happened, What The Gauges Recorded And The Flood Risk Now
The Boscastle flood struck the Cornish village on 16 August 2004, when intense rain sent the rivers Valency and Jordan over their banks. About two billion litres of water rushed through the village, destroying buildings and sweeping away vehicles, but nobody died.
What Happened During The Boscastle Flood?
On 16 August 2004, very heavy rain fell in storms close to Boscastle, and the Valency and Jordan rivers burst their banks and rushed through the village. The Met Office records that about 75mm of rain fell in two hours - the same amount that normally falls in the whole of August.
What official sources record:
| Measure | Figure | Source |
|---|---|---|
| Rainfall | about 75mm of rain fell in two hours - the same amount that normally falls in the whole of August | Met Office |
| Duration | Two million tonnes of water flowed through Boscastle caused by 5 hours of torrential rain | Environment Agency |
| Rivers | the Valency and Jordan | Met Office |
| Deaths | Fortunately, nobody died - thanks largely to a huge rescue operation involving helicopters | Met Office |
| Buildings destroyed | destroyed 4 properties in Boscastle and 2 at Crackington Haven, swept away about 115 vehicles | Environment Agency |
| Debris removed | around 4,000 tonnes of flood debris | Environment Agency |
The sources disagree on vehicles. The Environment Agency says flooding swept away about 115 vehicles; the Met Office lists the loss of 50 cars among the financial costs. Both figures are shown because neither source explains the difference.
Which Rivers Reached Their Highest Recorded Levels?
The rivers that flooded Boscastle were the Valency and its tributary the Jordan, which the Met Office says flows into the Valency just above the village. Both overflowed, sending a sudden rush of water down the Valency through the middle of Boscastle.
Which Areas Were Worst Affected?
Boscastle was worst affected, and flooding also hit Crackington Haven and surrounding areas of North Cornwall. The Environment Agency records that the flash floods affected hundreds of homes and businesses and badly damaged roads, bridges, sewers and other infrastructure.
How Many Flood Warnings Were Issued?
No flood warning count is given for the Boscastle flood. The flooding came from a sudden, intense storm, and the Environment Agency's national record of flood warnings starts in 2006, after this event.
Since then, the Environment Agency has said it introduced a bespoke flood warning service for Boscastle that uses information from rain and river gauges in the area.
How Does The Boscastle Flood Compare With Previous Floods?
The Boscastle flood was far smaller in area than national events such as the 1953 surge or the 2007 floods, but severe for the places it hit. The Environment Agency describes it as among "some of the worst floods ever seen in Britain".
| Event | Type | Deaths | Scale |
|---|---|---|---|
| Boscastle, August 2004 | Flash flood from intense rain | None | One village and nearby North Cornwall |
| Summer 2007 | Exceptionally heavy rainfall | 13 | 55,000 homes flooded |
| 1953 North Sea surge | Coastal storm surge | 307 in eastern England | About 160,000 hectares of eastern England were flooded |
More events are in the worst floods in UK history.
What Is The Flood Risk In The Affected Areas Now?
Flood risk in Boscastle is now shaped by the defences built after 2004. The Environment Agency reports that More than £10 million of improvements were carried out, including widening and deepening the River Valency and a flood relief culvert for the River Jordan.
The Environment Agency said in 2014: "Since their completion the new defences have worked successfully to protect communities across Boscastle and North Cornwall on several occasions, notably in 2010 and 2012."
- Check an address: check the flood risk of any UK postcode.
- How defences affect flood risk: why a Flood Zone 3 house can be Low risk.
- Surface water and flash flooding: surface water flooding.
floodriskchecker.co.uk is an independent website. It is not run by, or affiliated with, the Environment Agency, Defra, SEPA, Natural Resources Wales or any government body.
Sources (Verified 17 Sep 2026)
| Claim | Source |
|---|---|
| Date; two million tonnes; 5 hours; destroyed properties; 115 vehicles; debris; £10 million; defences; 2010 and 2012; bespoke warning service; "some of the worst floods ever seen in Britain" | Environment Agency, Tenth anniversary of Boscastle and North Cornwall Floods (14 Aug 2014) |
| 75 mm in two hours; two billion litres; Valency and Jordan; nobody died; 50 cars | Met Office, Boscastle floods case study |
| 1953 figures | Met Office, Floods case studies |
| Historic warnings start 2006 | Historic Flood Warnings dataset |