Three Mills Wall River Weir is a weir

Weir

A weir is a small overflow dam used to alter the flow characteristics of a river or stream. In most cases weirs take the form of a barrier across the river that causes water to pool behind the structure , but allows water to flow over the top...

 on the River Lea

River Lee (England)

The River Lea in England originates in Marsh Farm , Leagrave, Luton in the Chiltern Hills and flows generally southeast, east, and then south to London where it meets the River Thames , the last section being known as Bow Creek.-Etymology:...

, in the London Borough of Newham

London Borough of Newham

The London Borough of Newham is a London borough formed from the towns of West Ham and East Ham, within East London.It is situated east of the City of London, and is north of the River Thames. According to 2006 estimates, Newham has one of the highest ethnic minority populations of all the...

, near to Three Mills

Three Mills

The Three Mills are former working mills on the River Lea in the East End of London, one of London’s oldest extant industrial centres. The largest and most powerful of the four remaining tidal mills is possibly the largest tidal mill in the world...

.

The weir has been constructed across the Three Mills Wall River (also known as Shortwall) by British Waterways

British Waterways

British Waterways is a statutory corporation wholly owned by the government of the United Kingdom, serving as the navigation authority in England, Scotland and Wales for the vast majority of the canals as well as a number of rivers and docks...

 to control the levels in the Bow Back Rivers

Bow Back Rivers

The Bow Back Rivers are part of the River Lea in the London Borough of Newham, east London, England, and form a complex system of waterways. The River Lea was originally tidal as far as Hackney Wick; man-made changes to the river had changed this dramatically in the 9th century, and in 1110 a...

 and make then navigable for barges during the Olympic Park, London

Olympic Park, London

The Olympic Park in London is a new sporting complex currently under construction, adjacent to the Stratford City development in Stratford, Bow, Leyton & Homerton in East London for the 2012 Summer Olympics and Paralympics....

 construction phase and after the games, in conjunction with the Three Mills Lock

Three Mills Lock

Three Mills Lock, also known as the Prescott Lock is a lock on the Prescott Channel on the River Lea in London. The project was led by British Waterways and the lock officially opened on 5 June 2009....

, a lock

Lock (water transport)

A lock is a device for raising and lowering boats between stretches of water of different levels on river and canal waterways. The distinguishing feature of a lock is a fixed chamber in which the water level can be varied; whereas in a caisson lock, a boat lift, or on a canal inclined plane, it is...

.

The weir leads restricts the House Mill

House Mill

The House Mill is a major Grade I listed building on the River Lea in Bromley by Bow, London. Although the Three Mills date back to the Domesday book, the present house mill was rebuilt in 1776 by Daniel Bisson. It was damaged by fire in 1802, and then rebuilt by Philip Metcalfe.It is one of only...

 and Clock Mill mill pound, which used to extend to the Lea Bridge Sluices at Lea Bridge Road

Lea Bridge Road

Lea Bridge Road is a major through route in North East London, across the Lea Valley from Clapton to Whipps Cross in Leyton. Lea Bridge was once the name of a football stadium for Leyton Orient located along Lea Bridge Road. Lea Bridge Road is an excellent area for residence. The area is welcoming...

. The lock and weir came into operation in 2009.

See also

• Canals of the United Kingdom
  Canals of the United Kingdom
  The canals of the United Kingdom are a major part of the network of inland waterways in the United Kingdom. They have a colourful history, from use for irrigation and transport, through becoming the focus of the Industrial Revolution, to today's role for recreational boating...
  
  
• History of the British canal system
  History of the British canal system
  The British canal system of water transport played a vital role in the United Kingdom's Industrial Revolution at a time when roads were only just emerging from the medieval mud and long trains of pack horses were the only means of "mass" transit by road of raw materials and finished products The...