Almost £1.8 million will be invested to maintain and replace navigation structures on the Thames by the Environment Agency in the autumn and winter.
It said the investment is needed to maintain the river as a reliable premier navigation for boaters and all visitors to enjoy safely.
From November, 11 lock sites will benefit from capital investment to refurbish lock gates and make structural repairs.
“The Environment Agency has more than 1000 assets along the River Thames which we maintain and keep to good and safe working order - helping thousands of people navigate this great river with peace of mind," said Barrie Douglass, Environment Agency waterways engineer for the Thames.
“This year we are investing £1.8m and have a full programme of works.
"This combined with our dedicated staff who keep the River Thames working to a high standard, means that we can continue to provide an excellent level of service for boaters, businesses and the wider community.”
The following locks are among those that will be affected by closures:
Marlow Lock to replace lock gates January 5 to February 20
Cookham Lock to refurbish the lock gates and sluice gear - November 3 to December 19
Boulter's Lock in Maidenhead to refurbish the lock chamber and repair the lock gates and head layby - November 3 to January 30.
Romney Lock in Windsor to replace the lock gates - November 3 to December 22.
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