<P> The Jubilee River is a hydraulic channel in southern England . It is 11.6 km (7.2 mi) long and is on average 45 metres (148 feet) wide . It was constructed in the late 1990s and early 2000s to take overflow from the River Thames and so alleviate flooding to areas in and around the towns of Maidenhead, Windsor, and Eton in the counties of Berkshire and Buckinghamshire . It achieves this by taking water from the left (at this point eastern) bank of the Thames upstream of Boulter's Lock near Maidenhead and returning it via the north bank downstream of Eton, Berkshire . Although successful in its stated aims, residents of villages downstream claim it has increased flooding . </P> <P> The Environment Agency commissioned the design and construction of the river which cost £ 110 million . When it was formed, the channel was financially the largest man - made river project undertaken in Britain in absolute terms (not real terms), and the second largest in Europe . Principal works were creation of the channel, various flow control mechanisms and bridges for road, rail and foot traffic . One of these, Dorney Bridge, takes the channel through a 19th - century Brunel - designed railway embankment, built while the railway continued to carry arterial passenger and goods trains between London and destinations such as South Wales, Cornwall and Bristol . The Victorian tall embankment was reinforced by freezing (being "frozen"); then bored through, creating a large tunnel then a concrete culvert formed - to - fit was inserted . </P>

Where is the jubilee river flood channel located