In pictures: Olympic lock project

The new Prescott Lock is designed to take two 350-tonne barges at once.

Some 80 people are working on the project at any one time. Workers in the channel are protected by 4.8m-high cofferdams.

Next to the lock will be a water control mechanism called a fish-belly sluice. This is one of its gates.

Each of the lock gates weighs 17 tonnes. Pairs will be installed at both ends of the lock.

The waterways in this area used to be lined with factories and warehouses and plied by barges.

Now the same place looks very different. On the right is a Tesco car park.

Low and narrow bridges, like this one carrying the Northern Outfall Sewer, limited the size of barges for Olympic materials.

The House Mill (left), next to the former Clock Mill. At Three Mills studios (right), Big Brother was originally made.

The oldest of the House Mill's three water wheels. An appeal is under way to get the tide turning them again.

The weir above the House Mill will allow water out, but stop the tide going further upstream.

The northern Bow Back Rivers are surrounded by Olympic sites.

New waterside developments are already appearing in the lower Lea Valley.

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