TL;DR
Rivers can look calm on the surface but hide cold layers, fast currents, debris and changing depths beneath. RoSPA and the RNLI advise against swimming in unsupervised rivers, particularly during heatwaves when cold water shock risk is highest.
Rivers across the UK have been the scene of multiple tragedies during recent heatwaves. The Royal Society for the Prevention of Accidents and the RNLI both note that rivers can look calm on the surface but hide cold layers, fast currents, debris and rapid depth changes beneath, with cold water shock the most common cause of incidents.
Why rivers are particularly dangerous
Rivers carry water from upstream catchments that are often colder than the local area. A river running through warm countryside can still be at 8 to 10C in May, far colder than the air temperature on a heatwave day.
Surface water gives no indication of what lies below. Current speed, depth, submerged debris, weed and steeply shelving banks are all common hazards. River beds change with each flood and may not match a swimmer's previous experience of the same location.
The RoSPA position
The Royal Society for the Prevention of Accidents publishes guidance against swimming in open water that is not lifeguarded or part of an organised activity. Wild swimming groups can reduce risk by going in groups, wearing tow floats and choosing known locations.
Open Water Safety Code from RoSPA covers checking the location, going with others, knowing the swim out point, and avoiding alcohol. The code applies to coast, lake and river swimming equally.
Children and rivers
Children are at particular risk near rivers because of natural curiosity and the difficulty of supervising young swimmers in moving water. Reservoirs are similarly hazardous and account for a significant share of inland UK drowning deaths each summer.
Parents and carers should keep young children within arm's reach near any open water and identify a designated non-swimmer to monitor the group. Buoyancy aids are not a substitute for adult supervision.
What to do if someone falls in
Do not enter the water to try to rescue someone. Call 999 and ask for the Coastguard. The Coastguard coordinates inland rescues as well as coastal operations.
Throw a lifebuoy, rope or anything that floats. A long branch can also be used to extend reach from the bank without entering the water. Encourage the casualty to float and grasp anything that floats.
Where to swim safely
Lifeguarded beaches, swimming pools and supervised inland swim venues offer trained supervision and safety equipment. The Outdoor Swimming Society lists open water venues with proper safety provision across the UK.
Wild swimming groups can run their own safety briefings and group dynamics, with experienced members supporting newer swimmers. The British Heart Foundation, swimming organisations and the RNLI all publish open water safety briefings.
Key facts
- River temperatures can be 8 to 10C in May.
- Cold water shock is the most common incident factor.
- Reservoirs account for a significant share of inland drownings.
- RoSPA Open Water Safety Code covers checking, group swimming and avoiding alcohol.
- Coastguard handles inland rescues on 999.
FAQ
Why are rivers more dangerous than they look?
Surface water gives no indication of what lies below. Currents, depth, submerged debris and cold layers from upstream catchments all add risk. River beds change with each flood and may not match previous experience of the same spot.
Can I swim in a river safely?
RoSPA advises against unsupervised river swimming. Organised swims, wild swimming groups with safety briefings and lifeguarded venues offer the safest experience. The RoSPA Open Water Safety Code covers preparation.
Should I jump in to save someone?
No. Do not enter the water. Call 999 and ask for the Coastguard. Throw a lifebuoy, rope or anything that floats. A long branch can extend reach from the bank without entering the water.
Where can I find supervised open water swimming?
The Outdoor Swimming Society lists open water venues with proper safety provision across the UK. Lifeguarded beaches and pools also offer trained supervision.
