Page last updated at 01:06 GMT, Monday, 7 April 2008 02:06 UK

In pictures: Olympic lock project

The lock being built in the Prescott Channel (British Waterways)

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

Workers constructing the Prescott Lock

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

Fish belly sluice gate being delivered to the site (British Waterways)

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

Gates for the new Prescott Lock

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

The River Lee Navigation near the House Mill, 1931.

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

The same place on the Lee Navigation in 2008.

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

Northern Outfall Sewer Bridge over the Waterworks River

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

The House Mill (left), the former Clock Mill, and Three Mills studios (right).

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 At Three Mills studios (right), Big Brother was originally made.

Water wheel under the House Mill.

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

Weir on Three Mills Wall River

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

City Mill River in Olympic construction area

The northern Bow Back Rivers are surrounded by Olympic sites.

New development on the River Lee Navigation

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

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