The Jubilee River was built to reduce the risk of flooding from the River Thames to over 3,000 properties in Maidenhead, Windsor, Eton and Cookham. It was not fully operational for several weeks from 9 October 2020 - December 2020 while emergency repairs were carried out by the Environment Agency (EA) to Black Potts Weir. This initial work was to prevent further more serious damage to the structure of the weir and the railway viaduct above it. It enabled the weir to be used to reduce water levels during the high water December 2020 - February 2021.
The repairs require a team of divers and a pontoon supporting two cranes. The 'grout mattresses' underwater in the walls of the river need to be repaired and covered in sheet piling. In addition, this needs to be protected with huge boulders called rock armour. It's a big job!
Some problems were first noticed during a routine dive inspection in 2017, that flagged the site for re-inspection during the next high water, which happened in winter 2019-2020. The inspection took place in August 2020.
The repair plan has been extended to secure the structure for the next 60-100 years, including resilience to the increased flood risk due to climate change. The plan is for work to be completed in Autumn 2021. This larger project will be more efficient than a series of smaller repair projects. For more details and photos see the May 2021 EA briefing.
To signup for early warnings of flooding by phone, text or email visit the EA Floodline Warnings page or on call 0345 988 1188.