The fire service is urging people to take care during the end of term holiday when enjoying Berkshire's waterways.
'Yellow' warnings have been put in place at key areas of the River Thames by the Environment Agency due to extended river levels due to the floods at the start of the year.
The warnings advise users of all unpowered boats not to navigate and users of powered boats to navigate with caution.
Jess James, station commander at RBFRS' Water Rescue Unit is based, said: "Although river levels are reducing gradually, in many areas they are still higher and faster flowing than usual for this time of year.
"If you are thinking about taking a boat out on the river, please pay close attention to the water and weather conditions."
Visit www.environment-agency.gov.uk/homeandleisure/recreation for more information.
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